Subjects -> BUILDING AND CONSTRUCTION (Total: 146 journals)
    - BUILDING AND CONSTRUCTION (138 journals)
    - CARPENTRY AND WOODWORK (8 journals)

BUILDING AND CONSTRUCTION (138 journals)                     

Showing 1 - 35 of 35 Journals sorted alphabetically
A+BE : Architecture and the Built Environment     Open Access   (Followers: 34)
Academia : Architecture and Construction     Open Access   (Followers: 2)
Advances in Building Education     Open Access   (Followers: 8)
Advances in Building Energy Research     Hybrid Journal   (Followers: 13)
Ambiente Construído     Open Access   (Followers: 1)
Anales de Edificación     Open Access   (Followers: 1)
Asian Journal of Civil Engineering     Hybrid Journal   (Followers: 1)
Australasian Journal of Construction Economics and Building     Open Access   (Followers: 10)
Australasian Journal of Construction Economics and Building - Conference Series     Open Access   (Followers: 1)
Baltic Journal of Real Estate Economics and Construction Management     Open Access   (Followers: 3)
Baurechtliche Blätter : bbl     Hybrid Journal  
Bautechnik     Hybrid Journal   (Followers: 3)
BER : Architects and Quantity Surveyors' Survey     Full-text available via subscription   (Followers: 6)
BER : Building and Construction : Full Survey     Full-text available via subscription   (Followers: 12)
BER : Building Contractors' Survey     Full-text available via subscription   (Followers: 2)
BER : Building Sub-Contractors' Survey     Full-text available via subscription   (Followers: 2)
BER : Capital Goods Industries Survey     Full-text available via subscription  
BER : Survey of Business Conditions in Building and Construction : An Executive Summary     Full-text available via subscription   (Followers: 3)
Beton- und Stahlbetonbau     Hybrid Journal   (Followers: 2)
Building & Management     Open Access   (Followers: 3)
Building Acoustics     Hybrid Journal   (Followers: 4)
Building Research Journal     Open Access   (Followers: 4)
Building Services Engineering Research & Technology     Hybrid Journal   (Followers: 3)
Buildings     Open Access   (Followers: 8)
BUILT : International Journal of Building, Urban, Interior and Landscape Technology     Open Access   (Followers: 1)
Built Environment Inquiry Journal     Open Access  
Built Environment Project and Asset Management     Hybrid Journal   (Followers: 16)
Built-Environment Sri Lanka     Full-text available via subscription  
Case Studies in Construction Materials     Open Access   (Followers: 10)
Cement and Concrete Composites     Hybrid Journal   (Followers: 22)
Cement and Concrete Research     Hybrid Journal   (Followers: 22)
Challenge Journal of Concrete Research Letters     Open Access   (Followers: 7)
Challenge Journal of Concrete Research Letters     Open Access   (Followers: 6)
Change Over Time     Full-text available via subscription   (Followers: 3)
City, Culture and Society     Hybrid Journal   (Followers: 26)
Civil Engineering = Siviele Ingenieurswese     Full-text available via subscription   (Followers: 4)
Clay Technology     Full-text available via subscription  
Concreto y cemento. Investigación y desarrollo     Open Access   (Followers: 1)
Construction Economics and Building     Open Access   (Followers: 4)
Construction Engineering     Open Access   (Followers: 11)
Construction Management and Economics     Hybrid Journal   (Followers: 23)
Construction Research and Innovation     Hybrid Journal   (Followers: 4)
Construction Robotics     Hybrid Journal   (Followers: 3)
Corporate Real Estate Journal     Full-text available via subscription   (Followers: 6)
Dams and Reservoirs     Hybrid Journal   (Followers: 4)
Developments in the Built Environment     Open Access   (Followers: 1)
Energy and Built Environment     Open Access   (Followers: 1)
Engineering Project Organization Journal     Hybrid Journal   (Followers: 8)
Engineering, Construction and Architectural Management     Hybrid Journal   (Followers: 10)
Environment and Urbanization Asia     Hybrid Journal   (Followers: 4)
Facilities     Hybrid Journal   (Followers: 4)
Frontiers in Built Environment     Open Access   (Followers: 1)
FUTY Journal of the Environment     Full-text available via subscription   (Followers: 1)
Gaceta Técnica     Open Access  
GISAP : Technical Sciences, Construction and Architecture     Open Access  
Glass Structures & Engineering     Hybrid Journal  
Handbook of Adhesives and Sealants     Full-text available via subscription   (Followers: 2)
HBRC Journal     Open Access   (Followers: 2)
Heritage Matters : The Magazine for New Zealanders Restoring, Preserving and Enjoying Our Heritage     Full-text available via subscription   (Followers: 2)
Housing and Society     Hybrid Journal   (Followers: 6)
HVAC&R Research     Hybrid Journal  
Indoor and Built Environment     Hybrid Journal   (Followers: 3)
Informes de la Construcción     Open Access  
Intelligent Buildings International     Hybrid Journal   (Followers: 1)
International Journal of Advanced Structural Engineering     Open Access   (Followers: 25)
International Journal of Air-Conditioning and Refrigeration     Hybrid Journal   (Followers: 17)
International Journal of Architectural Computing     Full-text available via subscription   (Followers: 7)
International Journal of Built Environment and Sustainability     Open Access   (Followers: 8)
International Journal of Concrete Structures and Materials     Open Access   (Followers: 16)
International Journal of Construction Engineering and Management     Open Access   (Followers: 11)
International Journal of Construction Management     Hybrid Journal   (Followers: 4)
International Journal of Disaster Resilience in the Built Environment     Hybrid Journal   (Followers: 7)
International Journal of Housing Markets and Analysis     Hybrid Journal   (Followers: 10)
International Journal of Masonry Research and Innovation     Hybrid Journal   (Followers: 1)
International Journal of Protective Structures     Hybrid Journal   (Followers: 6)
International Journal of River Basin Management     Hybrid Journal   (Followers: 1)
International Journal of Structural Stability and Dynamics     Hybrid Journal   (Followers: 7)
International Journal of Sustainable Building Technology and Urban Development     Hybrid Journal   (Followers: 13)
International Journal of Sustainable Built Environment     Open Access   (Followers: 7)
International Journal of Sustainable Construction Engineering and Technology     Open Access   (Followers: 9)
International Journal of Sustainable Real Estate and Construction Economics     Hybrid Journal   (Followers: 2)
International Journal of the Built Environment and Asset Management     Hybrid Journal   (Followers: 5)
International Journal of Ventilation     Full-text available via subscription   (Followers: 1)
International Journal Sustainable Construction & Design     Open Access   (Followers: 4)
Journal for Education in the Built Environment     Open Access   (Followers: 3)
Journal of Aging and Environment     Hybrid Journal   (Followers: 6)
Journal of Architecture, Planning and Construction Management     Open Access   (Followers: 11)
Journal of Asian Architecture and Building Engineering     Open Access  
Journal of Building Construction and Planning Research     Open Access   (Followers: 11)
Journal of Building Engineering     Hybrid Journal   (Followers: 4)
Journal of Building Materials and Structures     Open Access   (Followers: 3)
Journal of Building Pathology and Rehabilitation     Hybrid Journal  
Journal of Building Performance Simulation     Hybrid Journal   (Followers: 8)
Journal of Civil Engineering and Construction Technology     Open Access   (Followers: 16)
Journal of Civil Engineering and Management     Open Access   (Followers: 9)
Journal of Computational Acoustics     Hybrid Journal   (Followers: 6)
Journal of Computing in Civil Engineering     Full-text available via subscription   (Followers: 22)
Journal of Construction Engineering     Open Access   (Followers: 9)
Journal of Construction Engineering, Technology & Management     Full-text available via subscription   (Followers: 6)
Journal of Construction Project Management and Innovation     Full-text available via subscription   (Followers: 8)
Journal of Facilities Management     Hybrid Journal   (Followers: 6)
Journal of Green Building     Full-text available via subscription   (Followers: 12)
Journal of Legal Affairs and Dispute Resolution in Engineering and Construction     Full-text available via subscription   (Followers: 5)
Journal of Property, Planning and Environmental Law     Hybrid Journal   (Followers: 4)
Journal of Structural Fire Engineering     Full-text available via subscription   (Followers: 6)
Journal of Sustainable Cement-Based Materials     Hybrid Journal  
Journal of Sustainable Design and Applied Research in Innovative Engineering of the Built Environment     Open Access   (Followers: 2)
Journal of the South African Institution of Civil Engineering     Open Access   (Followers: 2)
Journal of Transport and Land Use     Open Access   (Followers: 26)
Landscape History     Hybrid Journal   (Followers: 14)
Materiales de Construcción     Open Access   (Followers: 2)
Mauerwerk     Hybrid Journal  
Modular and Offsite Construction (MOC) Summit Proceedings |     Open Access   (Followers: 4)
Naval Engineers Journal     Hybrid Journal   (Followers: 2)
Open Construction & Building Technology Journal     Open Access  
Organization, Technology and Management in Construction     Open Access  
PARC Pesquisa em Arquitetura e Construção     Open Access  
Proceedings of the Institution of Civil Engineers - Forensic Engineering     Hybrid Journal  
Proceedings of the Institution of Civil Engineers - Urban Design and Planning     Hybrid Journal   (Followers: 13)
Revista ALCONPAT     Open Access   (Followers: 2)
Revista de la Construcción     Open Access  
Revista de Urbanismo     Open Access   (Followers: 2)
Revista Hábitat Sustenable     Open Access   (Followers: 1)
Revista IBRACON de Estruturas e Materiais     Open Access   (Followers: 1)
Revista Ingenieria de Construcción     Open Access   (Followers: 1)
Revista INVI     Open Access  
RILEM Technical Letters     Open Access  
Room One Thousand     Open Access  
Ruang-Space: Jurnal Lingkungan Binaan (Journal of The Built Environment)     Open Access  
Russian Journal of Construction Science and Technology     Open Access  
Science and Engineering of Composite Materials     Open Access   (Followers: 62)
Science and Technology for the Built Environment     Hybrid Journal   (Followers: 1)
Smart and Sustainable Built Environment     Hybrid Journal   (Followers: 8)
Steel Construction - Design and Research     Hybrid Journal   (Followers: 5)
Stroitel’stvo : Nauka i Obrazovanie     Open Access  
Structural Concrete     Hybrid Journal   (Followers: 10)
Structural Mechanics of Engineering Constructions and Buildings     Open Access   (Followers: 2)
Sustainable Buildings     Open Access   (Followers: 2)
Sustainable Cities and Society     Hybrid Journal   (Followers: 26)
Technology|Architecture + Design     Hybrid Journal  
Terrain.org : A Journal of the Built & Natural Environments     Free   (Followers: 3)
The Historic Environment : Policy & Practice     Hybrid Journal   (Followers: 6)
The IES Journal Part A: Civil & Structural Engineering     Hybrid Journal   (Followers: 6)
Tidsskrift for boligforskning     Open Access  
YBL Journal of Built Environment     Open Access  
Zeitschrift für Miet- und Raumrecht     Hybrid Journal  

           

Similar Journals
Journal Cover
International Journal of Structural Stability and Dynamics
Journal Prestige (SJR): 1.005
Citation Impact (citeScore): 2
Number of Followers: 7  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 0219-4554 - ISSN (Online) 1793-6764
Published by World Scientific Homepage  [119 journals]
  • Crashworthiness Analysis for Structural Stability and Dynamics
    • Authors: Sunil Kumar Sharma, Jaesun Lee
      Abstract: International Journal of Structural Stability and Dynamics, Volume 21, Issue 04, April 2021.
      In this paper, we fabricate human DNA and polar bear inspired thin-walled tube that tends to reduce the strength of decelerating force during impact, while escalating the amount of energy absorbed. The crashworthiness performance under axial impact is investigated using experimental analysis and non-linear finite element analysis (FEA). The investigation is conducted in three phases; the first phase consists of the design and fabrication of a novel bio-inspired tube (BIT) motivated by the most stable human DNA. Twelve BITs are created by filling cylindrical tubes into different positions of the BIT, which was inspired by the microstructural of polar bear hair. The second phase comprises the nonlinear FEA of energy-absorbed ability for different BITs under axial impact loading using LS-DYNA software, and then validated by the Simplified Super Folding Element (SSFE) theorem. In the third phase, Radial Basis Function (RBF) meta-models and Non-dominated Sorting Genetic Algorithm II (NSGA-II) are used for the multi-objective optimization design of BIT-11. The numerical simulation results are compared with the experimental results to confirm the crash behavior and energy absorption (EA) characteristics of the optimal structure over a base one. Based on the results, the suited configuration with required performance in crashworthiness is suggested, which should be incorporated into automobiles for safety consideration of passengers during an impact. The results show an increment of 49% in Specific Energy Absorption (SEA), suggesting the better choice of a particular tube over the base tube.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-04-19T07:00:00Z
      DOI: 10.1142/S0219455421500395
      Issue No: Vol. 21, No. 04 (2021)
       
  • Erratum: Nonlinear Free and Forced Vibrations of In-Plane Bi-Directional
           Functionally Graded Rectangular Plate with Temperature-Dependent
           Properties
    • Authors: Soheil Hashemi, Ali Asghar Jafari
      Abstract: International Journal of Structural Stability and Dynamics, Volume 21, Issue 04, April 2021.

      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-03-27T07:00:00Z
      DOI: 10.1142/S0219455421920012
      Issue No: Vol. 21, No. 04 (2021)
       
  • Buckling of Piles in Layered Soils by Transfer Matrix Method
    • Authors: Lu Zheng, Tao Deng, Qijian Liu
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      The transfer matrix method is applied to the buckling of end-bearing piles partially or fully embedded in a layered elastic medium with a constant coefficient of subgrade reaction for each layer. The solution of the governing differential equation for each pile segment can be expressed as the product of a fourth-order matrix and a coefficient determinant. Using the transfer matrix method and combining the boundary conditions at both ends of the pile, the buckling load is obtained by solving the eigenvalue equation. A parametric study is performed to investigate the effects of the properties of the soil–pile system on the stability capacity of the pile. It is shown that the effects of the embedment ratio, soil layer thickness, and soil stiffness on the buckling of piles are quite significant. Several calculation examples are presented to verify the present method.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-04-29T07:00:00Z
      DOI: 10.1142/S0219455421501091
       
  • Vibration Reduction Using Tuned Mass Dampers in Composite Steel Box Girder
           Footbridge with Self-Anchored Suspension
    • Authors: Pengzhen Lu, Yutao Zhou, Ying Wu, Dengguo Li, Chenhao Zhou
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      Owing to the increasing span of pedestrian bridges and the use of new lightweight and high-strength materials, the natural frequency of pedestrian bridges has been reduced significantly. A pedestrian bridge experiences a wide range of vibrations while being walked on by large crowds. This type of vibration affects the comfort of people walking on the footbridge and also the safety of the footbridge. This paper proposes a dynamic design method that is suitable for long-span composite footbridges. The footbridge considered in this study comprises a composite steel box girder with self-anchored suspensions and has a main span of 70.5[math]m. The dynamic characteristics of the long-span footbridge were analyzed using the finite element model, and the first 10 frequencies and mode shapes were obtained. Based on the global analysis of comfort standards, the comfort index for a practical evaluation was proposed, along with the walking excitation load. Meanwhile, a tuned mass damper (TMD) was adopted for the vibration reduction of the long-span footbridge constructed using a composite box girder with self-anchored suspensions in order to determine its applicability. Furthermore, the TMD layout was optimized using a GA. The results demonstrated that the proposed method can provide a theoretical basis and reference for the dynamic design of long-span composite pedestrian bridges.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-04-29T07:00:00Z
      DOI: 10.1142/S0219455421501108
       
  • Artificial Intelligence-Based Prediction Models for Optimal Design of
           Tuned Mass Dampers in Damped Structures Subjected to Different Excitations
           
    • Authors: Sadegh Etedali, Zohreh Khosravi Bijaem, Nader Mollayi, Vahide Babaiyan
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      Tuned mass damper (TMD) is a type of energy absorbers that can mitigate the vibrations of the main system if its frequency and damping ratios are well adjusted. By adopting simple assumptions on the structure and loadings, many analytical and empirical relationships have been presented for the estimation of the parameters for TMDs. In this research, methods based on the artificial intelligence (AI) techniques are proposed for optimal tuning of the TMD parameters of the main damped-structure for three kinds of loadings: white-noise base acceleration, external white-noise force, and harmonic base acceleration. For this purpose, a dataset using the cuckoo search (CS) optimization algorithm is created. The performance of the proposed methods based on the radial basis function (RBF) neural network, feed-forward neural network (FFNN), adaptive neuro-fuzzy inference system (ANFIS), and random forest (RF) techniques are evaluated by some statistical indicators. The results show the proper performance of these methods for the optimal estimation of the TMD parameters. Overall, the ANFIS method results in best matching with the observed dataset. Moreover, the simulation results indicate that the TMD’s optimal frequency ratio is reduced, while its optimal damping ratio is increased, against the increase in the TMD mass ratio of the main structure subjected to harmonic base acceleration. This trend with a less slope is observed for the optimal frequency ratio of the TMD in the main structure subjected to external white-noise force; however, the optimal damping ratio of the TMD is independent of its mass ratio in this case. Similar results are obtained for the main structure subjected to white-noise base acceleration.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-04-23T07:00:00Z
      DOI: 10.1142/S0219455421501200
       
  • Spall Behaviors of Metaconcrete: 3D Meso-Scale Modelling
    • Authors: Hexin Jin, Hong Hao, Wensu Chen, Cheng Xu
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      Spalling is a typical tensile fracture phenomenon due to insufficient tensile strength of concrete. Concrete structure might experience severe spall damage at the rear surface of the structure owing to reflected tensile stress wave induced by impulsive load. In recent years, metaconcrete consisting of engineered aggregates has attracted attentions as metaconcrete exhibits extraordinary wave-filtering characteristics. Metaconcrete can be used to attenuate stress wave generated by impulsive load and hence possibly mitigate the spall damage. In this study, engineered aggregate is designed via the software COMSOL to have the frequency bandgap coincide with the dominant frequency band of stress wave propagating in the normal concrete (NC) specimen to reduce the stress wave propagation and hence spall damage. The wave propagation behaviors in metaconcrete specimen with periodically distributed engineered aggregates have been investigated in a previous study. This study establishes 3D meso-scale model of metaconcrete including mortar, randomly distributed natural aggregates and engineered aggregates to simulate spall behaviors of metaconcrete via the software LS-DYNA. The responses of metaconcrete composed of engineered aggregates with single bandgap and multiple bandgaps are studied. The results show that stress wave can be more effectively attenuated by using engineered aggregates with multiple bandgaps. It is found that although engineered aggregates mitigate stress wave propagation, the soft coating of the engineered aggregates reduces the concrete material strength, therefore spall damage of metaconcrete specimen is not necessarily less severe than the normal concrete, but has different damage mode. In addition, the influences of loading intensity and duration on stress wave, as well as the spall behaviors of metaconcrete specimen are also studied.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-04-23T07:00:00Z
      DOI: 10.1142/S0219455421501212
       
  • Effects of Van Der Waals Forces on the Vibration of Stacked Multilayered
           Graphene/Black Phosphorus Heterostructures
    • Authors: Dongchang Hou, Lifeng Wang, Yiqing Zhang
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      In this paper, the vibration of a stacked multilayered graphene/black phosphorus (G/BP) heterostructure is investigated via the mesh-free method. The shape function and its derivatives are addressed by the moving least squares (MLS) approach. Optimization of the sequential quadratic programming method is adopted to calculate the distance between the arbitrary layers. Therefore, coefficients of the van der Waals (vdW) interaction between arbitrary layers of heterostructures are obtained. Then the frequencies and mode shapes of the multilayered G/BP heterostructure, considering the vdW interaction between arbitrary layers, are compared with considering only the vdW interaction among adjacent layers. The effects of the number of layers and aspect ratio of the G/BP heterostructure on the frequencies are investigated. The results demonstrate that coefficients of the vdW interaction, considering the arbitrary layers, are larger than those considering only adjacent layers. The difference between natural frequencies considering arbitrary layers and those considering adjacent layers is not clear for the low-order cases. Alternatively, the difference between natural frequencies obtained considering arbitrary layers and those considering adjacent layers are obvious for high-order cases. This paper provides a useful method to optimize the vdW interaction between multilayered G/BP heterostructures and can adequately simulate their vibration behaviors.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-04-22T07:00:00Z
      DOI: 10.1142/S0219455421501157
       
  • A Double Shape Memory Alloy Damper for Structural Vibration Control
    • Authors: Ying-Qi Jia, Chao Wang, Rui-Fu Zhang, Ling-Zhi Li, Zhou-Dao Lu
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      Shape memory alloy (SMA) dampers are widely investigated passive control systems for structural vibration mitigation. However, the damping robustness of conventional austenite SMA dampers may be affected by environmental temperature. In this study, an innovative double SMA damper (DSD) system is presented to improve the temperature robustness of the SMA dampers. In the proposed system, double SMA hysteretic elements with different phase transition temperatures are arranged in parallel, where the SMA element with lower transition temperature behaves as austenite under room temperature, and the other with higher transition temperature behaves as martensite. To study the vibration control effect, both single-degree-of-freedom (SDOF) and multiple-degree-of-freedom (MDOF) structures with DSD systems are employed. The thermal and mechanical behaviors of the SMA elements and the working principle of DSD are also introduced. Thereon, the equivalent linearization method for SMA’s output force and the motion-governing equations for SDOF structure with DSD are derived. Moreover, parametric studies are conducted to investigate the performance of the proposed DSD system in both frequency and time domains. Also, numerical analysis for the MDOF structure with DSD systems is carried out to illustrate the trend in response reduction with an increasing number of degrees of freedom. The analytical results show that the DSD can mitigate the structural seismic response more effectively than the conventional one with acceptable residual deformation, and is capable of delaying the degradation of SMA’s energy dissipation capacity. Less SMA material is required for the proposed DSD to fulfill the same mitigation requirement, and it is suitable for general applications for temperature robustness.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-04-21T07:00:00Z
      DOI: 10.1142/S021945542150098X
       
  • Ill-Posedness Determination of Moving Force Identification and Parameters
           Selection for Regularization Methods
    • Authors: Zhen Chen, Pudong Sun, Tommy H. T. Chan, Ling Yu
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      Moving force identification (MFI) from dynamic responses of bridges is a typical inverse problem with ill-posedness. Under the efforts of researchers, some regularization methods have been presented to solve the ill-posed problem, but there still lacks an effective index to reveal the ill-posedness of the vehicle–bridge dynamic system such that it can be utilized as a guidance for the regularization parameter selection. In this paper, an ill-posedness indicator (IPI) defined as the ratio of the Fourier coefficient to the singular value is adopted to reveal the ill-posedness in the MFI problem. Simulation results show that the larger the IPI value is, the more obvious the ill-posedness of the vehicle–bridge system equation, namely, the intrinsic factor of ill-posedness in MFI is attributed to very large IPI value. The maximum IPI value increases with the increasing noise level, which leads directly to the ill-posedness of the vehicle–bridge system equation. In addition, a relative percentage error (RPE) is used to select the optimal regularization parameters, while evaluating the ill-posedness existing in the MFI. Using the proposed IPI value, the influence of ill-posedness on identified results is evaluated in this study, which can assist qualitatively and quantitatively in selecting optimal regularization parameters and proper regularization methods.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-04-21T07:00:00Z
      DOI: 10.1142/S0219455421501145
       
  • A Dissipative Momentum-Conserving Time Integration Algorithm for Nonlinear
           Structural Dynamics
    • Authors: Salvatore Lopez
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      A second-order accurate single-step time integration method for nonlinear structural dynamics is developed. The method combines algorithmic dissipation of higher modes and conservation of linear and angular momentum and is composed of two phases. In the first phase, a solution point is computed by a basic integration scheme, the generalized-[math] method being adopted due to its higher level of high-frequency dissipation. In the second phase, a correction is hypothesized as a linear combination of the solution in the basic step and the gradient of vector components of the incremental linear and angular momentum. By solving a system composed of six linear equations, the searched for corrected solution in the time step is then provided. The novelty in the presented integration scheme lies in the way of imposing the conservation of linear and angular momentum. In fact, this imposition is carried out as a correction of the computed solution point in the time step and not through an enlarged system of equations of motion. To perform tests on plane and spatial motion of three-dimensional structural models, a small strains — finite rotations corotational formulation is also described.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-04-21T07:00:00Z
      DOI: 10.1142/S0219455421501169
       
  • Symplectic Superposition Solution of Free Vibration of Fully Clamped
           Orthotropic Rectangular Thin Plate on Two-Parameter Elastic Foundation
    • Authors: Xin Su, Eburilitu Bai, Alatancang Chen
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      Based on the method of separation of variables in Hamiltonian system and superposition method, the series expansion solution of the free vibration problem of orthotropic rectangular thin plates (ORTPs) with four clamped edges (CCCC) on two-parameter elastic foundation is obtained. The original vibration problem is decomposed into two subproblems with two opposite sides simply supported, and the general solution of each subproblem is obtained by using the expansion of symplectic eigenvectors. Then by superposing these two general solutions, the series expansion solution of the original problem is obtained. The advantage of this method is that the solution process is carried out in symplectic space, and the validity of variable separation and symplectic eigenvectors expansion ensures the rationality of the solution process, while avoiding the presetting of the solution form. Finally, the correctness of symplectic superposition solution obtained in this paper is verified by calculating three concrete examples of fully clamped rectangular thin plates.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-04-21T07:00:00Z
      DOI: 10.1142/S0219455421501224
       
  • A Novel Optimization Algorithm Based on Modal Force Information for
           Structural Damage Identification
    • Authors: Seyed Bahram Beheshti Aval, Pooya Mohebian
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      This paper proposes a novel optimization algorithm called modal force information-based optimization (MFIBO) to identify the location and severity of damage in structures. The main idea behind the MFIBO is to take advantage of information captured from the modal force of structural elements to seek the optimum damage variables. The modal element force, defined as the internal element force caused by the action of mode shapes, allows the MFIBO to recognize promising directions in the search space and assists in accelerating the optimization process. Indeed, unlike meta-heuristic optimization algorithms, which disregard explicit information about the problem and rely only upon time-consuming stochastic search computations, the MFIBO employs an informed search strategy to perform optimization in a rational and directed manner. In order to assess the effectiveness and applicability of the proposed MFIBO algorithm, four benchmark damage identification examples of truss and frame structures are conducted under both noise-free and noisy conditions. In each example, the results of the MFIBO are also compared with those attained by two well-known meta-heuristic algorithms, namely the differential evolution and the teaching–learning-based optimization. The obtained results reveal that the MFIBO is able to accurately and reliably identify structural damage with a significantly lower computational burden compared to the meta-heuristic algorithms.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-04-17T07:00:00Z
      DOI: 10.1142/S0219455421501005
       
  • An Efficient Weighted Residual Time Integration Family
    • Authors: Mohammad Rezaiee-Pajand, S. A. H. Esfehani, H. Ehsanmanesh
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      A new family of time integration methods is formulated. The recommended technique is useful and robust for the loads with large variations and the systems with nonlinear damping behavior. It is also applicable for the structures with lots of degrees of freedom, and can handle general nonlinear dynamic systems. By comparing the presented scheme with the fourth-order Runge–Kutta and the Newmark algorithms, it is concluded that the new strategy is more stable. The authors’ formulations have good results on amplitude decay and dispersion error analyses. Moreover, the family orders of accuracy are [math] and [math] for even and odd values of [math], respectively. Findings demonstrate the superiority of the new family compared to explicit and implicit methods and dissipative and non-dissipative algorithms.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-04-17T07:00:00Z
      DOI: 10.1142/S0219455421501066
       
  • Experimental Study on Load Bearing Capacity of Prefabricated Partially
           Encased Composite Beams
    • Authors: Kai Wu, Shiqi Lin, Xiaoyi Liu, Fanshen Mao, Chengwei Tan
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      To study the load bearing capacity of prefabricated partially encased composite (PEC) beams, 12 specimens were tested under cyclic loadings. According to the test results, when shear span ratio increases, the failure mode of the specimen changes from shear to bending, while the load bearing capacity of specimens decreases. Some specimens showed asymmetric damage of concrete on both sides of steel web, causing specimens’ bearing capacity to be controlled by bending and shearing as well as by torsion. The use of threaded rods has little effect on the ultimate load of prefabricated PEC beams, but has a great influence on the reduction rate of the load with the increase in shear span ratio. Using the superposition principle, a formula for calculating the shearing capacity of prefabricated PEC beams was proposed. Based on the plane section hypothesis, a method for predicting the bending capacity was also proposed. Two reduction factors were proposed to account for the negative effect of asymmetric damage on the bearing capacity and the weakened bending capacity of specimens without threaded rods. The calculated results match well with the experimental ones. Therefore, they can be used to predict the bending and shearing capacity of prefabricated PEC beams, while providing a reference for engineering design.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-04-16T07:00:00Z
      DOI: 10.1142/S0219455421501042
       
  • Transverse Vibration Energy Harvesting of Double Elastic Steel
    • Authors: Yi-Ren Wang, Chien-Chun Hung, Jung-Ting Tseng
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      This study uses the piezoelectric technology to collect vibration energy from the fixed-fixed nonlinear elastic beams attached with the piezo-patch between the two ends. Both single elastic steel sheet (SESS) and double elastic steel sheet (DESS) systems are investigated and correlated. To simulate the power generation of the vibration energy harvester (VEH) of both the SESS and the DESS in different engineering elements, the simple harmonic external force generated by a shaker at the location of the piezo-patch is used as the source. With this, more vibration converted electric energy is derived from the transverse deformation and flapping from the DESS than the SESS beam. The equation of a nonlinear Euler–Bernoulli beam is coupled with the electric energy equation of the piezo-patch to simulate the SESS VEH system. The flapping force from the DESS VEH system can be considered the concentrated external load applied on the SESS beam model. The method of multiple scales (MOMS) is employed to analyze this nonlinear problem. The fixed points plots and the numerical results confirm this theory presented for the two beam systems, which can be used for evaluating similar engineering systems. Experiments are also performed in this study. The Taguchi method is used to analyze the optimum locations of the shaker and piezo-patch, as well as the confidence level of the factors. The method of nonlinear analysis presented in this study demonstrates its accuracy compared with the linear case. The transverse DESS VEH model proposed is proved to be feasible and more effective than the SESS system.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-04-16T07:00:00Z
      DOI: 10.1142/S0219455421501133
       
  • Interaction Dynamic Response of a High-Speed Train Moving Over Curved
           Bridges with Deficient or Surplus Superelevation
    • Authors: Jin Shi, Dengke Ma, Ya Gao
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      This paper proposes a three-dimensional dynamic model for high-speed railway trains moving over curved bridges considering the transition curves, circular curves, and superelevation. Key features of this study are to consider the nonlinear geometrical relationships and creep relationships between the wheels and rail, for which the interactive iterative numerical algorithms are developed based on the equations of vertical displacement and rolling of wheelset, and the torsional resonance conditions of the vehicle–bridge system are verified. The results show that the torsional vibration will cause amplification on vertical dynamic response of the beam on the outside edge of the curve. The deficient/surplus superelevation plays an important role in the lateral and torsional angular displacements of the bridge, and the peak of the torsional resonance response can be reduced by adjusting the practical superelevation of the curve. The variations of wheel–load reduction rate and derailment coefficient in the curve section are positively correlated to the deficient/surplus superelevation. The curve radius is the key factor affecting the wear and fatigue of wheel–rail, and when the curve radius is greater than 7000 m, the wear and fatigue can be significantly reduced. Running at a deficient superelevation level can also reduce the wear and fatigue.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-04-12T07:00:00Z
      DOI: 10.1142/S0219455421501030
       
  • Theoretical Formulation of Three-Mass Vehicle Model for
           Vehicle–Bridge Interaction
    • Authors: Judy P. Yang
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      The vehicle–bridge interaction (VBI) is studied using a semi-analytical approach based on a three-mass vehicle model. As most work analyzes vehicle–bridge interaction numerically and/or analytically by treating the vehicle as a simplified lumped mass, to the best of the author’s knowledge, this work first presents the theoretical formulation of the three-mass VBI system, where a more realistic vehicle model equipped with a rigid mass and two unsprung mass-spring-damper systems is considered. By assuming the first modal vibration of beam, the semi-analytical solutions are derived, which can be served as the reference solutions for calibrating VBI analyses using different models or methods.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-04-10T07:00:00Z
      DOI: 10.1142/S0219455421710048
       
  • Time–Frequency Random Approach for Prediction of Subway Train-Induced
           Tunnel and Ground Vibrations
    • Authors: Lidong Wang, Xiumeng Bu, Yan Han, Zhihui Zhu, Peng Hu, C. S. Cai
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      A time–frequency random approach is proposed in this paper for the prediction of subway train-induced tunnel and ground vibrations. This is a development of the random approach previously proposed by the authors, which takes the discrete track support, singular track defects, etc., into consideration. The proposed approach is developed using a two-step method. First, the pseudo-excitation method (PEM) and the two-dimensional multibody system/finite element method model are effectively combined to derive the track–tunnel pseudo-interaction forces by employing the power spectral density of track irregularity. Second, the random vibrations of the tunnel–soil system are obtained via the PEM in the wavenumber–frequency domain. To improve the computational efficiency, a fast-computing strategy is proposed based on the multipoint synchronous algorithm. Using numerical examples, the proposed time–frequency hybrid modeling process is verified by comparing it with the fully coupled time-dependent three-dimensional approach. Furthermore, the influence of the discrete track support on the random vibrations of the tunnel and ground is discussed by comparing the results predicted by the proposed approach with those predicted by the previously developed approach.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-04-08T07:00:00Z
      DOI: 10.1142/S0219455421501017
       
  • Using a Single-DOF Test Vehicle to Simultaneously Retrieve the First Few
           Frequencies and Damping Ratios of the Bridge
    • Authors: Y. B. Yang, K. Shi, Z. L. Wang, H. Xu, B. Zhang, Y. T. Wu
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      Bridge damping ratios are extracted via the skillful use of the single-degree-of-freedom (DOF) test vehicle for the first time in this paper. Central to the simultaneous retrieval of the first few frequencies and damping ratios from the contact (point) response of the bridge is the use of the variational mode decomposition (VMD) and random-decrement technique (RDT). Closed-form solutions are newly derived for the vehicle and contact responses of the damped bridge and validated later numerically. Using the proposed method, one calculates first the mono-component from the contact response by the VMD; then extracts the free-decay response for each mode by the RDT; and finally identifies the frequency and damping ratio by the Hilbert transform. The parametric study confirms that: (1) the contact response outperforms vehicle’s response in retrieving bridge frequencies and damping ratios; (2) the first few frequencies can be identified with robustness for reasonable levels of road roughness, vehicle speed, bridge damping and noise; (1) good result is obtained for the first damping ratio, in spite of the traditional uncertainty existing with damping; and (2) ongoing traffic can enhance the proposed method for bridge identification.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-04-08T07:00:00Z
      DOI: 10.1142/S021945542150108X
       
  • Elastic-Plastic Buckling and Postbuckling Finite Element Analysis of
           Plates Using Higher-Order Theory
    • Authors: Maciej Taczała, Ryszard Buczkowski, Michal Kleiber
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      In this paper, some of the displacement-based plate theories are used to investigate the elastic-plastic analysis of plates in the framework of the finite element method including the buckling and postbuckling effects with the focus on the general third-order plate theory (GTPT). The plate calculation results were compared with the results obtained using 64-nodes solid elements involving Lobatto integration scheme. The problem is solved using the Newton–Raphson method applying modified Crisfield constant arc-length procedure. The results show good agreement of results and the GTPT can be acknowledged to fulfill essential criteria for application to the elastic-plastic analysis of thin and thick plates.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-04-07T07:00:00Z
      DOI: 10.1142/S0219455421500954
       
  • Analytical Solution for Sound Radiation Characteristics of Graphene
           Nanocomposites Plate: Effect of Porosity and Variable Edge Load
    • Authors: Vijay Gunasekaran, Jeyaraj Pitchaimani, Lenin Babu Mailan Chinnapandi, Ashish Kumar
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      The effects of graded dispersion of graphene platelets and porosity on vibro-acoustics of nanocomposite plate exposed to variable edge loads are analytically investigated. Voigt and Halpin–Tsai micromechanics model is used to obtain effective properties of the porous graphene nanocomposites. The strain energy technique is implemented to estimate the buckling load ([math]). By means of Reddy’s third-order shear deformation theorem and Rayleigh Integral, vibration and acoustic responses are obtained. After validating the present analysis with the published results, the nature of edge loads on buckling and vibro-acoustic response is significant. It is noted that an increase in the intensity of non-uniform in-plane loads leads to changes in free vibration modes and resonant amplitude of response. The weight percentage and grading pattern of graphene reinforcement cause the stiffness hardening effect, whereas porosity distribution and coefficients cause the stiffness softening effect on the nanocomposite plate. It is found that the plate with symmetric distribution of graphene platelets with more concentration at the surface and symmetric porosity variation with more porosity at the center radiates less sound power.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-04-05T07:00:00Z
      DOI: 10.1142/S0219455421500875
       
  • Failure Criteria and Wind-Induced Vibration Analysis for an Offshore
           Platform Jacking System
    • Authors: Hong-Nan Li, Hui-Juan Liu, Xing Fu, Kuo Zhao, Xiao-Long Yang, Zhi-Fei Wen
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      Currently, the construction process of large offshore platforms worldwide involves building the topside and hull separately and then having them integrated. Jacking technology is emerging as a new integration method more suitable for offshore platform construction for its higher tonnage and larger scales compared with the lifting technology. Conventionally, an overlapped support tower (OST) is adopted to jack the topside to a predetermined height. However, with the OST’s increasing jacking height, the wind load effect becomes more significant, which in turn limits the OST height and applications. In this paper, failure criteria were developed for the OST based on the load types and structural characteristics of easy assembly and disassembly. Then a simplified method to simulate the OST was proposed. In addition, a finite element model (FEM) of the entire jacking system with the topside and OST (including 6 jacking towers, 8 strand cables and 23 bracing pipes) was established, and wind-induced vibration analysis was performed to ensure safety of the jacking system. The results show that the addition of the topside increases the torsional effect of the jacking system; the unfavorable wind angles are 0° and 15°, which should be paid much attention during the jacking operation. The recommended wind-induced vibration coefficients for the OST and topside are 3.0 and 4.0, respectively. The proposed method and simulation results of this study provide a reference for the jacking and integration design of similar offshore platforms.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-04-05T07:00:00Z
      DOI: 10.1142/S0219455421501054
       
  • Modified Adaptive Negative Stiffness Device with Variable Negative
           Stiffness and Geometrically Nonlinear Damping for Seismic Protection of
           Structures
    • Authors: Huan Li, Jianchun Li, Yang Yu, Yancheng Li
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      Adaptive negative stiffness device is one of the promising seismic protection devices since it can generate seismic isolation effect through negative stiffness when it is mostly needed and achieve similar vibration mitigation as a semi-active control device. However, the adaptive negative stiffness device generally combined with linear viscous damping underpins the drawback of degrading the vibration isolation effect during the high-frequency region. In this paper, a modified adaptive negative stiffness device (MANSD) with the ability to provide both lateral negative stiffness and nonlinear damping by configuring linear springs and linear viscous dampers is proposed to address the above issue. The negative stiffness and nonlinear damping are realised through a linkage mechanism. The fundamentals and dynamic characteristics of a SDOF system with such a device are analyzed and formulated using the Harmonic Balance Method, with a special focus on the amplitude–frequency response and transmissibility of the system. The system with damping nonlinearity as a function of displacement and velocity has been proven to have attractive advantages over linear damping in reducing the transmissibility in the resonance region without increasing that in the high-frequency region. The effect of nonlinear damping on suppressing displacement and acceleration responses is numerically verified under different sinusoidal excitations and earthquakes with different intensities. Compared with linear damping, the MANSD with nonlinear damping could achieve additional reductions on displacement and acceleration under scaled earthquakes, especially intensive earthquakes.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-04-05T07:00:00Z
      DOI: 10.1142/S0219455421501078
       
  • Nonlinear Dynamic and Stability Analysis of an Edge Cracked Rotating
           Flexible Structure
    • Authors: Milad Azimi, Samad Moradi
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      The Homotopy Perturbation Method (HPM) is applied to investigate the nonlinear free and forced vibration behavior of the rotating cracked beam. Nonlinear governing equations considering the two-dimensional (2D) large flexible structure in a rotating reference frame considering centrifugal forces are obtained by the Lagrangian approach and the Assumed Mode Method (AMM). The crack is modeled as an elastic nonlinear massless rotational spring, which divides the beam into two parts. The Rayleigh–Ritz method is used to discretize the governing system of equations of the motion. Stability analysis along with bifurcation and phase portrait represents the different behavior of the system, depending on the variations of base angular velocity, crack location, and stiffness. Moreover, it is shown that as the rotational speed increases, a tensile force appears along the neutral axis, stiffening the cracked structure, which results in shifting the backbone to the right and highly affects the nonlinear features of the system. The results obtained through a comparative study of the HPM with first-order approximation and numerical simulations (Runge–Kutta algorithm) demonstrate an accurate and effective solution for structures with nonlinear dynamics.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-04-01T07:00:00Z
      DOI: 10.1142/S0219455421500917
       
  • Geometrically Nonlinear Dynamic Response of Perforated Plates by Modified
           Differential Quadrature Method
    • Authors: Chen Wang, Rongqiang Liu, Jiangping Huang
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      The paper presents a modified differential quadrature (MDQ) method to investigate the dynamic response of perforated plates with elastically restrained edges under uniaxial impact compressive load. The perforated plate is divided into several separate plate elements that can be connected by using penalty function method (PFM) to ensure continuity along the shared edges. The in-plane stress distribution of the plate under the mechanical edge loading is determined by the pre-buckling analysis. To analyze the effect of elastically restrained edges on the dynamic response of perforated plates, artificial springs imposed for the edges are considered in the governing equilibrium equations. Verification analysis is carried out to demonstrate the efficiency and accuracy of the proposed method by comparing the results obtained with those available in the literature. Finally, the various effects of initial imperfection, rotational restrained stiffness, hole size and location, and shear load, on the dynamic response of perforated plates are investigated. The results show that the dynamic buckling load of perforated plates is significantly influenced by the rotational restraint stiffness, hole size and shear load as well as the initial geometric imperfection, whereas the effect of hole location can be neglected in the analysis of dynamic buckling of plates. Additionally, the results predicted by the proposed method can correlate well with the available numerical results.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-04-01T07:00:00Z
      DOI: 10.1142/S0219455421500978
       
  • Buckling of Two-Directional Functionally Graded Cylindrical Beams Based on
           a High-Order Cylindrical Beam Model
    • Authors: Chu-Feng Gao, Ying-Hui Pan, Wucheng Zhang, Jian-Xin Rao, Yong Huang
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      In this paper, a high-order cylindrical beam model, where the shear deformation is taken into account, will be used to analyze the buckling behaviors of the functionally graded cylindrical beams with radially and axially varying material inhomogeneities. The coupled governing equations for buckling of a cylindrical beam under axial compression are derived, which can be translated into a single differential equation by introducing an auxiliary function. The shifted Chebyshev polynomials are used to compute the critical buckling loads for kinds of boundary conditions. By comparing with the three-dimensional solutions for buckling of homogeneous circular beams, the validity of the introduced model is confirmed. Two typical material property distributions defined by the exponential- and power-law are considered. A parametric study is carried out to investigate the effects of material gradient indexes on the critical buckling loads.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-04-01T07:00:00Z
      DOI: 10.1142/S0219455421500991
       
  • Local-Coordinate Representation for Spatial Revolute Clearance Joints
           Based on a Vector-Form Particle-Element Method
    • Authors: Yanfeng Zheng, Hua-Ping Wan, Jingyao Zhang, Chao Yang, Yaozhi Luo, Makoto Ohsaki
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      Previously, the contact states between the bearing and journal of a spatial revolute joint (SRJ) with both axial and radial clearances were solved in the global coordinate system (GCS), which is complex and requires iterations. In this paper, a local-coordinate representation for the SRJs with clearance is combined with a vector-form particle-element method, i.e. finite particle method (FPM), to provide a more practical means for evaluation of the dynamic effects due to clearance. Firstly, the fundamentals of the FPM for analysis of spatial mechanisms are briefed. Then, a local-coordinate representation based on the revolution axis of the bearing is proposed. Specifically, the geometry of the journal and bearing is explicitly expressed using the coordinate transformation. The axial and radial contact states are evaluated by substituting the parametric equations and transforming them to quadratic and quartic equations, respectively, which can be analytically solved without iterations. The contact forces are evaluated in the local-coordinate representation and then transformed into the GCS representation. Two numerical examples, i.e. a spatial slider-crank mechanism and a spatial double pendulum, are provided to demonstrate the feasibility of the proposed method, by which the effects of joint-joint interaction and joint-flexible component interaction are fully discussed.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-03-31T07:00:00Z
      DOI: 10.1142/S0219455421500930
       
  • Experimental Study of the Nonlinear Torsional Flutter of a Long-Span
           Suspension Bridge with a Double-Deck Truss Girder
    • Authors: Ming Li, Yanguo Sun, Yongfu Lei, Haili Liao, Mingshui Li
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      The purpose of this study is to investigate the nonlinear torsional flutter of a long-span suspension bridge with a double-deck truss girder. First, the characteristics of nonlinear flutter are studied using the section model in the wind tunnel test. Different aerodynamic measures, e.g. upper and lower stabilizers and horizontal flaps, are applied to improve the flutter performance of the double-deck truss girder. Then, the full bridge aeroelastic model is tested in the wind tunnel to further examine the flutter performance of the bridge with the optimal truss girder. Finally, three-dimensional (3D) flutter analysis is performed to study the static wind-induced effects on the nonlinear flutter of the long-span suspension bridge. The results show that single-degree-of-freedom torsional limit cycle oscillations occur at large amplitudes for the double-deck truss section at the attack angles of [math] and [math]. The upper and lower stabilizers installed on the upper and lower decks, respectively, and the flaps installed near the bottoms of the sidewalks can all effectively alleviate the torsional flutter responses. Meanwhile, it is found that the torsional flutter responses of the truss girder in the aeroelastic model test are much smaller than those in the section model test. The 3D flutter analysis demonstrates that the large discrepancies between the flutter responses of the two model experiments can be attributed to the additional attack angle caused by the static wind-induced displacements. This finding highlights the importance and necessity of considering the static wind-induced effects in the flutter design of long-span suspension bridges.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-03-31T07:00:00Z
      DOI: 10.1142/S0219455421501029
       
  • Nonlinear Dynamic Analysis and Control of FG Cylindrical Shell Fitted with
           Piezoelectric Layers
    • Authors: Aliakbar Bayat, Amir Jalali, Habib Ahmadi
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      In this study, the nonlinear vibration control of functionally graded laminated piezoelectric cylindrical shells under simultaneous parametric axial and radial external excitations is presented. The partial differential equations of shells are derived based on Hamilton’s principle, first-order shear deformation theory (FSDT), and nonlinear von Karman relations. The coupled nonlinear ordinary differential equations are obtained by Galerkin’s procedure and solved by the method of static condensation. Two piezoelectric layers are placed on the outer and inner surfaces of the cylindrical shell each as distributed sensor and actuator. Then the constant-gain negative velocity feedback strategy is employed. Regarding the nonlinear equations of motion, for the first time, the vibration analysis and active vibration control of smart FG cylindrical shells under combined parametric and external excitations are analyzed using the multiple scales approach. The effects of various parameters such as power index, external excitation’s amplitude, and control gain on the dynamic behavior of the system are investigated, using bifurcation diagrams, phase portraits, time histories, and Poincare maps. It is shown that quasi-periodic motion is the most common behavior of the system and controller gain and power index have inevitable effects on enhancing the quasi-periodic response of the system. Care should be exerted in selecting the parameters to have the desired response in the broad range of excitation frequency.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-03-27T07:00:00Z
      DOI: 10.1142/S0219455421500838
       
  • A Numerically Scaled Spring-Friction System and Validation by Shaking
           Table Test
    • Authors: Shanshan Li, Ping Xiang, Biao Wei, Chengjun Zuo, Lizhong Jiang, Weikun He
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      The seismic isolation efficiency of different friction-based devices needs verification by shaking table test, but faces problems in scaling before the test due to their frictional nonlinearity. To solve the scaling problems, a simplified civil structure, isolated by a self-centering spring-friction device, was numerically scaled in different ways considering the effect of friction action. The seismic responses of the scaled models were scaled back to those of the prototype and compared with the seismic responses of the prototype. The scaling problems and solutions were validated by a shaking table test on simply supported bridges using friction pendulum bearings (FPBs). The results show that both the unscaled gravity on a shaking table and the unscaled non-uniform friction distribution cause an inaccurate friction force in the structural motion equations of scaled models, and thus causing the scaling errors. One new and valid solution, i.e. changing the friction coefficient and scaling the non-uniform friction distribution to keep an accurate friction force for the scaled models, is put forward to avoid the scaling errors thoroughly. Another new solution shows that an increasing peak ground acceleration (PGA) can increase the other forces, while weakening the ratio of inaccurate friction force in the structural motion equations of the scaled models, which therefore reducing the scaling errors of acceleration and relative displacement responses, but not the scaling errors of residual displacement responses. In addition, the time-varying friction, the interface separation and collision of bearings, and other complex factors are found to cause scaling errors and need further investigation.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-03-27T07:00:00Z
      DOI: 10.1142/S0219455421500929
       
  • Dynamic Characterization of Steel Decks with Damping Material by Impact
           Test
    • Authors: P. Silvestri, T. Pais, F. Gaggero, M. Bassetti
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      Acoustic insulation optimization of the ship decks to contain impact noise is generally obtained by adopting suitable types of viscoelastic resilient materials. For this purpose, it is necessary to be able to make a correct choice of material. This is obtained by experimentally identifying the vibro-acoustic behavior of the combined semi-reverberant room and floor system according to an ISO standard (ISO 16283-2). These tests are generally onerous as they require the availability of the floor with both trimmed and untrimmed configurations. In addition, qualified technicians are needed to correctly spread the material on the floor. Finally, after the test has ended, the material must be removed and disposed of properly. To reduce this wasted time and cost, in this paper, a new methodology is proposed that predicts the vibro-acoustic behavior of the floor and viscoelastic material assembled together starting from separate dynamic information of the two components. Once these two elements are properly experimentally identified, the proposed method foresees the vibro-acoustic response of the overall system in presence of an impact footfall excitation.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-03-27T07:00:00Z
      DOI: 10.1142/S0219455421500966
       
  • An Efficient Approach for Stochastic Vibration Analysis of High-Speed
           Maglev Vehicle-Guideway System
    • Authors: Zhiwu Yu, Peng Zhang, Jianfeng Mao, Pol D. Spanos, Y. Frank Chen
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      The high-speed maglev vehicle-guideway coupled system (MVGCS) is a complex system, whose random vibration characteristics have not been well studied due to a limited number of examples. To address this issue, a new efficient approach is proposed for the random vibration analysis of the MVGCS, which combines the probability density evolution method and multi-time step method with multiple random loads considered. The random model established for 10-degree-of-freedom maglev vehicles and guideway is time-dependent, considering two different supporting conditions. The Monte Carlo method is used to assess the accuracy and efficiency of the proposed approximate approach, and the random model is verified through comparison with available results. The stochastic dynamic responses of the vehicles, guideway, and electromagnetic levitation forces, including the mean values and standard deviations, are determined in a case study. The results show that the proposed method is feasible for the dynamic analysis of maglev systems with a reasonably good efficiency in computation. Furthermore, critical parametric analyses involving vehicle speed, irregularity, and cut-off wavelength are performed with the results discussed.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-03-25T07:00:00Z
      DOI: 10.1142/S0219455421500802
       
  • Seismic Reliability analysis of Cable-Stayed Bridges Subjected to
           Spatially Varying Ground Motions
    • Authors: Jin Zhang, Ke-Jian Chen, Yong-Ping Zeng, Zhen-Yu Yang, Shi-Xiong Zheng, Hong-Yu Jia
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      To efficiently and accurately evaluate the seismic system reliability analysis (SSRA) of cable-stayed bridges subjected to spatially varying ground motions, a direct probabilistic framework was developed in this paper. First, the relevant methods for the structural seismic reliability were presented, including the multiplicative dimensional reduction method, maximum entropy method with fractional moments (FMs), and the product of conditional marginals (PCMs). Second, based on the OpenSees platform, the 3D finite element model of the cable-stayed bridge was established, along with the uncertain structural parameters, stochastic ground motions, and failure modes of each structural component under earthquake loading summarized. Third, considering the double uncertainties of the bridge and ground motions, the nonlinear time history analysis was conducted for the bridge under various scenarios. Finally, the nonlinear seismic response and fractional moment of the structural response were obtained. The maximum entropy method with FMswas used to get the probability density function (pdf) of the structural response, together with the failure probability and reliability index of each component. Considering the correlation between components, the PCMs was used to obtain the failure probability of the bridge under earthquake loadings, and some critical conclusions were drawn.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-03-25T07:00:00Z
      DOI: 10.1142/S0219455421500942
       
  • Numerical Simulation of a Cable-Stayed Bridge Subjected to Ship Collision
    • Authors: Xiao-Qing Zhou, Jia-Zhu Hong, Yong Xia
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      Long-span cable-stayed bridges are subjected to the risk of collision from passing ships. Conducting experimental study on the collision of bridges and vessels is difficult due to high cost and limited space. In this paper, the behavior of a 1[math]018-m long-span cable-stayed bridge subjected to ship collisions is numerically studied. Finite element models of the entire bridge and ships are established. Four different dead weight tonnages (DWT), namely, 2[math]700, 12[math]000, 30[math]000, and 75[math]000[math]t, with impact velocities of 1[math]m/s to 6[math]m/s are investigated. The complete collision process under different loading scenarios is simulated, from which the collision force, bridge responses and local damage are obtained. The calculated collision force is significantly affected by the impact velocity and DWT, and exhibits a linear relationship with the impact velocity. Comparison with design codes shows that different codes vary significantly in estimating the collision force and Eurocode provides most accurate results. The effect of the material model on the collision force is also studied. This numerical study provides a reference for the ship collision design of long-span cable-stayed bridges.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-03-24T07:00:00Z
      DOI: 10.1142/S0219455421500863
       
  • A Hybrid Approach for the Dynamic Instability Analysis of Single-Layer
           Latticed Domes with Uncertainties
    • Authors: Ning An, Huidong Zhang, Xinqun Zhu, Fei Xu
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      Currently, there is no unified criterion to evaluate the failure of single-layer latticed domes, and an accurate nonlinear time-history analysis (NTHA) is generally required; however, this does not consider the uncertainties found in practice. The seismic instability of domes subjected to earthquake ground motions has not been thoroughly investigated. In this paper, a new approach is developed to automatically capture the instability points in the incremental dynamic analysis (IDA) of single-layer lattice domes by integrating different efficient and robust methods. First, a seismic fragility analysis with instability parameters is performed using the bootstrap calibration method for the perfect dome. Second, based on the Sobol sequence, the quasi-Monte Carlo (QMC) sampling method is used to efficiently calculate the failure probability of the dome with uncertain parameters, in which the truncated distributions of random parameters are considered. Third, the maximum entropy principle (MEP) method is used to improve the computational efficiency in the analyses of structures with uncertainties. Last, the uncertain interval of the domes is determined based on the IDA method. The proposed method has been used to investigate the instability of single-layer lattice domes with uncertain parameters. The results show that it can determine the probability of structural failure with high efficiency and reliability. Additionally, the limitations of the proposed method for parallel computation are discussed.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-03-22T07:00:00Z
      DOI: 10.1142/S0219455421500826
       
  • Analyzing the Thermal Post-Buckling of Composite Plate Containing an
           Elliptical Cut-Out Using a Particle Semi-Energy Method
    • Authors: M. Dehghani
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      In this research, nonlinear thermal buckling and post-buckling behaviors of composite plate with the circular/elliptical cut-out are investigated using particle semi-energy (PSE) method. The semi-energy method is based on the solution of compatibility equation via an Airy force function and out-of-plane displacement function. The unknown parameters of these functions are determined by minimizing the potential energy. The integral of potential energy are replaced with summation of particles energy at perforated plate. The cut-out is modeled easily using these particles. The advantages of this method are easily cut-out modeling by particles and proposing just one of the displacement fields (i.e. out-of-plane). Based on the results, there is a good agreement (1.25%) between the post-buckling loads derived from PSE of this paper and experimental test of other literature. The accuracy of the finite element method (FEM) is 7.5% with respect to experimental test. The influences of temperature distribution, the cut-out size and elliptical cut-out rotating on post-buckling load and deflection of perforated plate are investigated.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-03-22T07:00:00Z
      DOI: 10.1142/S0219455421500887
       
  • Minimum Diameter of Optimally Located Damping Wire to Maximize the
           Fundamental Frequencies of Rotating Blade Using Timoshenko Beam Theory
    • Authors: Mehdi Asgarikia, Farshad Kakavand
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      In this study, the optimum position and minimum diameter of damping wire were investigated to maximize the fundamental frequencies of a rotating blade. The blade was modeled as an isotropic, homogenous and constant cross-sectional cantilever rotating beam. The damping wire was modeled as an intermediate elastic support. In most rotating-beam applications, such as turbine blades, the slenderness ratio is low; therefore, Timoshenko beam theory was selected to analyze the model. The optimal position and minimum stiffness of elastic support were determined to maximize the natural frequencies of the beam using the finite element method. Minimum diameter of the damping wire was calculated by determining the minimum stiffness. Parameter sensitivity analysis showed that the angular velocity of the blade has no remarkable effect on the optimal position and minimum diameter of damping wire.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-03-20T07:00:00Z
      DOI: 10.1142/S0219455421500905
       
  • Large Amplitude Free Vibration Analysis of Isotropic Curved
           Nano/Microbeams Using a Nonlocal Sinusoidal Shear Deformation Theory-Based
           Finite Element Method
    • Authors: G. Prateek, De Sarthak, R. Vasudevan, M. Haboussi, M. Ganapathi
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      In this investigation, the nonlinear flexural free vibration characteristics of size dependent curved isotropic nano/microbeams are studied using the nonlocal elasticity theory along with the sinusoidal shear deformation theory (SSDT). Based on Hamilton’s principle, the governing equations are derived in terms of generalized displacements using finite element approach. The formulation by extending the von-Karman model accounts for both large deflections and rotations in the strain displacement definition. Direct iterative procedure is used to solve the nonlinear problem through eigenvalue procedure. This investigation aims to study the effect of various design parameters like slenderness ratio of the beam, curved beam included angle, nonlocal parameter, and boundary conditions on the amplitude–frequency response obtained from the free vibration behavior of curved nano/microbeams. This study is very useful to designers for optimal design of nano/microsystem involving structural elements of the beam type.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-03-19T07:00:00Z
      DOI: 10.1142/S0219455421500747
       
  • Free Transverse Vibration of Nickel Coated Carbon Nanotubes
    • Authors: M. Gökhan Günay
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      Transverse vibration of nickel coated carbon nanotubes is investigated by using molecular dynamics simulations. The simulations are carried out for armchair and zig-zag carbon nanotubes with various lengths. Uncoated and nickel coated carbon nanotubes having same lengths are analyzed and their vibrational behaviors are compared. Free transverse vibrations of nickel coated carbon nanotubes are modelled by using a two-phase local–nonlocal Euler–Bernoulli beam model and solved by finite element method. Nonlocal parameter of the beam model is calibrated based on molecular dynamics simulation results. It is seen that for the same length diameter ratio, the nickel coated carbon nanotubes have similar vibrational characteristics with the uncoated carbon nanotubes but their natural frequencies are smaller than the uncoated ones. Also, it is shown that by using proper nonlocal parameters for each radius length ratio, the two-phase local–nonlocal Euler–Bernoulli beam model can successfully predict the natural frequencies of both short and long nanotubes. Besides natural frequencies and mode shapes, the clustering of nickel atoms depend on simulation temperature which is discussed during oscillation of nickel coated carbon nanotubes.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-03-19T07:00:00Z
      DOI: 10.1142/S0219455421500851
       
  • Bound on Amplitude of a MEMS Resonator by Approximating the Derivative of
           the Lyapunov Function in Finite Time
    • Authors: Raghavendra D. Naik, Shridhar D. Mhalsekar
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      We propose a methodology to obtain the amplitude of a nonlinear differential equation that may not satisfy Lyapunov’s global stability criterion. This theory is applied to the MEMS resonator which has a high-quality factor. The derivative of the Lyapunov function approximated for a finite time and an optimization problem was formulated. The local optima were obtained using the Karush–Kuhn–Tucker conditions, for which the amplitude was analytically formulated. The obtained amplitude, when compared with that by the numerical method, showed the validity of the analytical approximation for a useful range of the nonlinearity, but accurate only at an excitation frequency [math]. This methodology will be useful to approximate the damping in a system if one obtains the amplitude from the experimental data near this excitation frequency.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-03-19T07:00:00Z
      DOI: 10.1142/S0219455421710036
       
  • Adaptation of a Deep Liquid-Containing Tank into an Effective Structural
           Vibration Control Device by a Submerged Cylindrical Pendulum Appendage
    • Authors: Tanmoy Konar, Aparna (Dey) Ghosh
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      Due to a high proportion of impulsive liquid mass and low inherent damping, liquid-containing deep tanks, such as conventional overhead water tanks, are generally not considered for design as tuned liquid dampers (TLDs) for passive vibration control of structures under lateral excitation. This paper presents a novel concept to convert deep tanks into effective vibration control systems through the incorporation of a submerged cylindrical pendulum appendage (CPA). The CPA is placed in the impulsive liquid zone of the tank and its oscillating frequency is tuned to the dominant frequency of the primary structure. When laterally excited, the primary structure transfers vibrational energy to the CPA, thereby setting it into oscillation. The motion of the CPA is opposed by the drag exerted by the surrounding liquid on it, which leads to dissipation of the vibrational energy. This particular design utilizes impulsive liquid mass in the energy dissipation mechanism, while allowing fluctuation in the liquid level in the upper region of the tank, thereby fulfilling the functional requirements of the tank. In this paper, the mathematical model and working principle of the deep tank with CPA (DT-CPA) damper are developed. The equations of motion of a two degree-of-freedom (2-DOF) structure-damper system are derived. The design of the DT-CPA damper is illustrated considering an example structure and the performance of the damper is examined by subjecting the structure-damper system to pre-recorded seismic base excitations. The sensitivity of the performance of the proposed damper to tuning ratio is further studied. Results indicate that the DT-CPA damper is effective in controlling structural vibrations and its performance is comparable to that of a conventional tuned mass damper (TMD) and even slightly superior to that of a conventional TLD system of the shallow tank configuration. The proposed concept thus holds potential for the utilization of deep tanks as energy dissipation devices with minimal interference to their usual functionality.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-03-17T07:00:00Z
      DOI: 10.1142/S0219455421500784
       
  • Exact Solutions of Linear Buckling for a Class of FGM Columns with Varying
           Cross-Section
    • Authors: Marco Fabiani, Lando Mentrasti
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      This paper deals with the linear buckling problem for inhomogeneous Euler–Bernoulli column having both mechanical and geometrical properties variable along its length. Four classes of longitudinally functionally graded material columns with variable cross-sections are considered. The solutions of the relevant differential equations are obtained in terms of both hypergeometric functions and elementary functions. The normalized buckling loads are computed for five typical boundary conditions and they are validated by a comparison with approximate numerical results available in literature. The proposed formulation may provide a further benchmark for the accuracy assessment of numerical and approximated solutions.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-03-17T07:00:00Z
      DOI: 10.1142/S0219455421500796
       
  • Multi-Point Suspension Design and Stability Analysis of a Scaled Hoop
           Truss Antenna Structure
    • Authors: Guoliang Ma, Minglong Xu, Longlei Dong, Zhuo Zhang
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      This paper proposes a scaled model to investigate the dynamic characteristics and stability of a hoop truss antenna on the ground. First, the statically indeterminate equation for the multi-point suspension is established, along with the voltage of the suspension motor calculated. Then the transfer function of the system is theoretically established. The scaled model is established before and after suspension, and the static deformation and natural frequency of the system are obtained by calculation and measurement. There exist the shaking mode and nodding mode. Also, a vibration experiment is conducted for the system to obtain the vibration response. With this, the transfer function is identified by the system identification method, which appears to be of the second order, and the stability is analyzed through the zero pole diagram. The experiment results show that the first two frequencies are close before and after suspension. Moreover, the stability of the system can be judged by the open-loop transfer function. It is concluded that the vibration experimental data of the scaled model can be used as a reference for the large hoop truss antenna structure.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-03-12T08:00:00Z
      DOI: 10.1142/S0219455421500772
       
  • Prediction of Beyond Design and Residual Performances of Viscoelastic
           Dampers by a Simplified Fractional Derivative Model
    • Authors: Shiang-Jung Wang, Qun-Ying Zhang, Chung-Han Yu
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      When subjected to excessive shear deformation, viscoelastic (VE) dampers may inevitably suffer from damages, due to their VE material layers with limited thickness. Under the circumstance, their stiffness and energy dissipation capabilities may deteriorate but not totally vanish. To estimate the seismic performances of viscoelastically damped structures, the beyond design and residual performances of damaged VE dampers are crucial to protect structures from severe failure during the following main shock or aftershocks. On the other hand, for new viscoelastically damped structures under the normal design earthquakes, neglecting the residual performance of damaged VE dampers may result in nonconservative design. Thus, this study aims to provide approaches to analytically characterize the beyond design and residual performances of damaged full-scale VE dampers. Based on the simplified fractional derivative model, the analytical predictions have been compared with the experimental results. The proposed model works well for the design performance of the intact full-scale VE dampers. Particularly, it can also reproduce the beyond design and residual performances of damaged full-scale VE dampers, if due consideration is taken of the effects of excitation frequencies, ambient temperatures, temperature rises, softening, and hardening.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-03-11T08:00:00Z
      DOI: 10.1142/S0219455421500814
       
  • Frictional Impact-Contacts in Multiple Flexible Links
    • Authors: M. Ahmadizadeh, A. M. Shafei, R. Jafari
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      Multiple impacts of 2D (planar) open-loop robotic systems composed of [math] elastic links and revolute joints are studied in this paper. The dynamic equations of motion for such systems are derived by the Gibbs-Appell recursive algorithm, while the regularized method is employed to model the impact-contact mechanism. The Timoshenko beam theory is used to model the transverse vibrations of the links. Also, both the structural damping and air damping are considered to enhance the modeling accuracy. The system joints are assumed to be frictionless and slack-free, but friction force is included for the links colliding with the ground. The [math]-flexible-link system considered goes through a flight phase and an impact phase during its motion. In the impact phase, new equations of motion are derived by including the terms caused by the viscoelastic forces in the system’s differential equations. Owing to the extremely short acting time of the impact force, the related differential equations can be solved only via special treatment, i.e. by detecting the exact moment of impact. To this end, entering or leaving the impact phase is analyzed and controlled with high precision by a special computational algorithm presented in this work. To demonstrate the efficacy and precision of the algorithm developed, computer simulations are conducted to study the dynamic behavior of a 3-link robotic mechanism. To investigate the effect of mode shape on the elastic deformation of links, four different mode shapes are used in the simulations and their results are compared.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-03-10T08:00:00Z
      DOI: 10.1142/S0219455421500759
       
  • A Dimensionless Number for Response of Blast Loaded Steel Plates
    • Authors: Hongyuan Zhou, Pengli Cong, Xiaojuan Wang, Tianyi Song, Xin Huang
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      The response of monolithic steel plates subjected to blast was extensively studied, and dozens of dimensionless numbers were proposed to predict the response. While the existing dimensionless numbers are not convenient to use in some scenarios with relatively complicated conditions, the dimensionless number proposed for blast loaded steel plates based on dimensional analysis extends the range of application. Different from other dimensionless numbers, the properties of medium with which the blast load transmits are incorporated to extend the application range to more general scenarios. The responses of the plate subjected to both near-field blast with non-uniform load and far-field blast with uniform load, i.e. both the external and internal blasts (for steel boxes), are reasonably predicted. The physical implication of the proposed dimensionless number is clear in that the media properties, geometrical features, characteristics of material, and loading are incorporated, which are readily available in test. A variety of test data are used to validate the applicability and versatility of the proposed dimensionless number.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-03-08T08:00:00Z
      DOI: 10.1142/S0219455421500723
       
  • Further Assessment of Three Bathe Algorithms and Implementations for Wave
           Propagation Problems
    • Authors: Jinze Li, Kaiping Yu, Hong Tang
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      This paper further analyzes three Bathe algorithms ([math]-Bathe, [math]-Bathe and [math]-Bathe) with their unknown properties revealed. The analysis shows firstly that three Bathe algorithms can cover two common integration schemes, trapezoidal rule and backward Euler formula, and that the second-order [math]-Bathe algorithm is algebraically identical to the [math]-Bathe algorithm. Via formulation of the generalized two-sub-step Newmark algorithm, it is shown that the common Newmark method cannot be considered as a special case of the [math]-Bathe algorithm. For wave propagation problems, optimal Courant–Friedrichs–Lewy (CFL) numbers for reducing dispersion errors are found for the three Bathe algorithms by considering spatial and temporal discretizations simultaneously, while the modified integration rules are used for the element mass and stiffness matrices to reduce the anisotropy in wave propagating directions. The recommended optimal algorithmic parameters are given for the three Bathe algorithms to help users effectively solve various dynamic and wave propagation problems.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-03-08T08:00:00Z
      DOI: 10.1142/S0219455421500735
       
  • Attenuation and Prediction of the Ground Vibrations Induced by High-Speed
           Trains Running Over Bridge
    • Authors: Yunshi Zhang, Yu Lou, Nan Zhang, Yanmei Cao, Liu Chen
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      This paper aims to study the transfer laws of vibration signals in the free field near a high-speed train line by conducting a field test. The characteristics of ground vibration acceleration were analyzed in the time and frequency domains, and a prediction method in the frequency domain was proposed. The results show: (1) there is a vibration amplification area away from the bottom of the pier under the influence of high-speed trains running over the bridge due to the fluctuation attenuation of the vibration waves; (2) the dominant peak frequency points in the frequency spectrum of the acceleration can be regarded as the resonance frequency induced by periodic loading; and (3) the soil vibration can be effectively predicted by the proposed method with a strong capability to defend the interference of environmental vibrations according to the comparison between the predicted value and the experimental data.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-03-08T08:00:00Z
      DOI: 10.1142/S0219455421500760
       
  • Analytical Analysis of Interaction Between a Heavy Vehicle and a Simply
           Supported Light Bridge Based on Frequency Modulation
    • Authors: Yao Zhang, Kang Hai Tan
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      This paper analyzes the interaction between a heavy vehicle and a simply supported light bridge based on frequency modulation technique, in which variations of instantaneous frequencies of both bridge and heavy vehicle are considered. The bridge is modeled as a simply supported Euler beam and the heavy vehicle is simplified as a spring-mass system. The variation of instantaneous frequencies of both bridge and vehicle induced by the moving vehicle is usually neglected in classical analysis to decouple the pair of governing equations. However, the coupled vehicle–bridge interaction (VBI) system becomes time-varying and the pair of governing equations cannot be decoupled when the vehicle/bridge mass ratio cannot be neglected. The instantaneous frequencies of both bridge and heavy vehicle including their higher vibration modes are investigated herein. An analytical solution describing the dynamic response of the time-varying VBI system is developed by using the frequency modulation technique. Both Finite Element (FE) method and published experimental data are used for comparison purpose. The predictions of the proposed method match better with those obtained from the FE simulations and experimental measurements than the classical method. Five numerical examples have been adopted to compare the performance of the proposed model and the classical method: the former performs generally well, especially when the vehicle is heavy, or the vehicle frequency is near to the bridge frequency. The classical method is only a special case of the proposed model if either the mass or the stiffness of the vehicle is relatively small compared to the corresponding terms of the bridge. The performance of the proposed method has also been examined in four typical scenarios, where vehicle damping, multi-degree-of-freedom (MDOF) vehicle, road surface roughness, and two-span continuous bridge are involved.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-03-08T08:00:00Z
      DOI: 10.1142/S021945542150084X
       
  • Forced Vibration Responses of Smart Composite Plates using Trigonometric
           Zigzag Theory
    • Authors: Aniket Chanda, Rosalin Sahoo
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      The Trigonometric Zigzag theory is utilized in this research for analytically evaluating the forced vibration responses of smart multilayered laminated composite plates with piezoelectric actuators and sensors. This theory, as the name suggests, incorporates a trigonometric function, namely the secant function for describing the nonlinear behavior of transverse shear stresses through the thickness of the smart composite plates. The kinematics for the in-plane displacement components are obtained by superposing a globally varying nonlinear field through the thickness of the plate structure on a piecewise linearly varying zigzag field with slope discontinuities at the layer interfaces. The model also satisfies the inter-laminar continuity conditions of tractions at the interfaces of the multilayered plate. The equations of motion are derived using Hamilton’s principle, and the separation of the variables technique is extended to assume the solutions for the primary variables in space and time and solved analytically using Navier’s solution technique along with Newmark’s time integration scheme. A detailed analytical investigation of the dynamic behavior of the smart laminated plate coupled with piezoelectric materials like PVDF and piezoelectric fiber-reinforced composite (PFRC) is carried out by considering several forms of the time-dependent electromechanical excitations and also covering different geometrical and material features of the smart plate structure. The responses are found to be in close agreement with the elasticity solutions and some new results are also presented to show the dynamic controlling capacity of the piezoelectric layers.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-03-04T08:00:00Z
      DOI: 10.1142/S021945542150067X
       
  • Seismic Wave Propagation in Framed Structures by Joint-Based Wave
           Refraction Method
    • Authors: R. Rafiee-Dehkharghani, M. Samadzad, M. Bitaraf, R. Fallahi
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      This paper studies the dynamic behavior of the structural frames subjected to seismic loadings using a joint-based wave refraction method. The beams of the frame are modeled by the Timoshenko beam theory to consider the rotary inertia and shear deformation effects. The whole frame is considered as an assemblage of the waveguides connected with joints and boundary conditions, including discrete spring–dashpots for modeling the foundation supports that are generally treated as discontinuities. The wave refraction matrices at the discontinuities are derived analytically and the final assembled system of equations are solved numerically. The accuracy of the method is validated using an experimental setup and its performance is assessed for a 15-story concrete moment frame subjected to real ground motions. The soil structure interaction effect is also considered in the simulations using discrete spring–dashpot elements. The results show that the wave refraction method can be effectively used as an alternative means for the seismic analysis of the frames. In comparison with numerical methods such as finite element method, the proposed method is computationally efficient, while its accuracy and cost are independent of the loading frequency and the length of waveguides.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-03-03T08:00:00Z
      DOI: 10.1142/S0219455421500541
       
  • Numerical Studies on the Air–Membrane Interaction of ETFE Cushions
    • Authors: Xiaofeng Wang, Zhuoran Li, Qingshan Yang
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      Inflated membranes are popularly used in civil and aerospace engineering. They are flexible and their behaviors are featured by the interaction between the inner air pressure and deformation of the enveloping membrane (air–membrane interaction) which has not yet received attention in the literature. This paper aims at studying the air–membrane interaction and its influence on the static and dynamic properties of an inflated membrane by numerically analyzing a square ETFE (ethylene–tetrafluoroethylene) cushion. To account for the air–membrane interaction, the inner air was regarded as a linear potential fluid in developing the governing equations. The finite element model was derived from the discretized equations and verified through comparison with experimental results and those in the literature. Thereafter, the air–membrane interaction and its variation with influencing factors were investigated in the static and dynamic analysis by comparing results from the verified finite element model with the numerical solutions where the inner air was treated as the traction boundary conditions of the enveloping membrane. Results of this study indicate that (1) air–membrane interaction becomes more prominent with increasing external load and is gradually weakened with a rise in the frequency order; (2) air–membrane interaction makes the top membrane joined with the bottom membrane in the deformation and vibration; and (3) air–membrane interaction is strengthened with an increase in the initial inner pressure or geometric dimensions, but weakened when the membrane thickness or rise–span ratio increases. The present research is helpful to the understanding of the role the inner air plays in the behavior of inflated membranes, and may therefore improve the accuracy in analysis and the rationality in the design.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-03-03T08:00:00Z
      DOI: 10.1142/S0219455421500711
       
  • Buckling and Postbuckling of Plates Made of FG-GPL-Reinforced Porous
           Nanocomposite with Various Shapes and Boundary Conditions
    • Authors: R. Ansari, R. Hassani, R. Gholami, H. Rouhi
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      Within the framework of a variational mixed formation and higher-order shear deformation theory (HSDT), a numerical approach is developed in this research to investigate the buckling and post buckling behaviors of variously-shaped plates made of functionally graded graphene platelet-reinforced composites (FG-GPLRCs) taking the effect of porosity into account. By the proposed approach, which can be named as VDQ-FEM, thick and moderately thick plate-type structures with different shapes (e.g. rectangular, skew, or quadrilateral) with arbitrary-shaped cutout (e.g. circular or rectangular) can be studied. Various types for porosity distribution scheme and GPL dispersion pattern including uniform and different functionally graded patterns are considered along the thickness of plate. In the computation of material properties, the closed-cell Gaussian Random field scheme and Halpin–Tsai micromechanical model are utilized. One of the key novelties of proposed approach is developing an efficient way according to the mixed formulation to accommodate the continuity of first-order derivatives on the common boundaries of elements for the used HSDT model. Several numerical examples are given to analyze the influences of porosity coefficient/distribution pattern, GPL weight fraction/dispersion pattern, cutout and boundary conditions on the buckling and postbuckling characteristics of FG-GPLR porous composite plates.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-02-27T08:00:00Z
      DOI: 10.1142/S0219455421500632
       
  • Two-Stage Automated Operational Modal Analysis Based on Power Spectrum
           Density Transmissibility and Support-Vector Machines
    • Authors: Zhi-Wei Chen, Kui-Ming Liu, Wang-Ji Yan, Jian-Lin Zhang, Wei-Xin Ren
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      Power spectrum density transmissibility (PSDT) functions have attracted widespread attention in operational modal analysis (OMA) because of their robustness to excitations. However, the selection of the peaks and stability axes are still subjective and requires further investigation. To this end, this study took advantage of PSDT functions and support-vector machines (SVMs) to propose a two-stage automated modal identification method. In the first stage, the automated identification of peaks is achieved by introducing the peak slope (PS) as a critical index and determining its threshold using the SVM classifier. In the second stage, the automated identification of the stability axis is achieved by introducing the relative difference coefficients (RDCs) of the modal parameters as indicators and determining their thresholds using the SVM classifier. To verify its feasibility and accuracy, the proposed method was applied to an ASCE-benchmark structure in the laboratory and in a high-rise building installed with a structural health monitoring system (SHMS). The results showed that the automated identification method could effectively eliminate spurious modes and accurately identify the closely spaced modes. The proposed method can be automatically applied without manual intervention, and it is robust to noise. It is promising for application to the real-time condition evaluation of civil structures installed with SHMSs.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-02-26T08:00:00Z
      DOI: 10.1142/S0219455421500681
       
  • Dynamic Stiffness Formulation for Out-of-Plane Natural Vibration of
           Elastically Supported Functionally Graded Plates
    • Authors: Md. Imran Ali, Mohammad Sikandar Azam
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      In this paper, the natural vibration characteristics of elastically supported functionally graded material plate are investigated using the dynamic stiffness method (DSM). Power-law functionally graded (P-FG) plate, the material properties of which vary smoothly along the thickness direction following the power-law function, that has been used for the analysis. Classical plate theory and Hamilton’s principle are used for deriving the governing differential equation of motion and associated edge conditions for P-FG plate supported by elastic foundation. During the formulation of dynamic stiffness (DS) matrix, the concepts of rotary inertia and neutral surface are implemented. Wittrick–Williams (W-W) algorithm is used as a solving technique for the DS matrix to compute eigenvalues. The results thus obtained by DSM for the isotropic, P-FG plate, and the P-FG plate with elastic foundation compare well with published results that are based on different analytical and numerical methods. The comparisons indicate that this approach is very accurate. Furthermore, results are provided for elastically supported P-FG plate under four different considerations in order to see the differences in frequencies with the inclusion or exclusion of neutral surface and/or rotary inertia. It is noticed that the inclusion of rotary inertia and neutral surface influences the eigenvalues of P-FG plate, and that cannot be discounted. The study also examines the influence of plate geometry, material gradient index, edge conditions, and elastic foundation modulus on the natural frequency of P-FG plate.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-02-25T08:00:00Z
      DOI: 10.1142/S0219455421500620
       
  • Nonlinear Vibration Analysis of Viscoelastic Smart Sandwich Plates Through
           the use of Fractional Derivative Zener Model
    • Authors: Hamid Reza Talebi Amanieh, Seyed Alireza Seyed Roknizadeh, Arash Reza
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      In this paper, the nonlinear vibrational behavior of a sandwich plate with embedded viscoelastic material is studied through the use of constitutive equations with fractional derivatives. The studied sandwich structure is consisted of a viscoelastic core that is located between the faces of functionally graded magneto-electro-elastic (FG-MEE). In order to determine the frequency-dependent feature of the viscoelastic layer, four-parameter fractional derivative model is utilized. The material properties of FG-MEE face sheets have been distributed considering the power law scheme along the thickness. In addition, for derivation of the governing equations on the sandwich plate, first-order shear deformation plate theory along with von Karman-type of kinematic nonlinearity are implemented. The derived partial differential equations (PDEs) have been transformed to the ordinary differential equations (ODEs) through the Galerkin method. After that, the nonlinear vibration equations for the sandwich plate have been solved by multiple time scale perturbation technique. Moreover, for evaluating the effect of different parameters such as electric and magnetic fields, fractional order, the ratio of the core-to-face thickness and the power low index on the nonlinear vibration characteristics of sandwich plates with FG-MEE face sheets, the parametric analysis has been performed. The obtained results revealed the enhanced nonlinear natural frequency through an increment in the fractional order. Furthermore, the prominent influence of fractional order on the nonlinear frequency of sandwich plate was declared at the negative electric potential and positive magnetic potential.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-02-24T08:00:00Z
      DOI: 10.1142/S0219455421500619
       
  • Analysis of the Bi-Stable Hybrid Laminate under Thermal Load
    • Authors: M. Fazli, M. H. Sadr, H. Ghashochi-Bargh
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      Adaptive structures have the ability to modify their shapes in different operational conditions. Multi-stable structures are one of the methods of making adaptive structures. In the bi-stable square laminates, due to geometric symmetry and equality of strain energy between stable states, it is possible to continue actuating between stable states, specially when using dynamic or thermal load. The bi-stability of the hybrid square laminated structure with the stacking sequence of [0/90/Al] is asymmetric. This leads to inequality of strain energy in stable states and therefore, development of an effective method to control and avoid automatic actuating. In this paper, the deformation and strain energy of the bi-stable hybrid square laminated structure is investigated. To show the effect of elastic boundary condition, a similar section with the stacking sequence of [0/0/Al] is connected to the mentioned hybrid laminate. The effects of the temperature, the presence of an aluminum layer and its thickness on the potential multiple shapes are also studied. To check the accuracy, the bi-stability behavior is investigated using finite element analysis and the results are compared with the experimental data.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-02-24T08:00:00Z
      DOI: 10.1142/S0219455421500693
       
  • Simulation of the Dynamic Behavior of a Centenary Metallic Bridge under
           Metro Traffic Actions Based on Advanced Interaction Models
    • Authors: D. Ribeiro, B. Costa, L. Cruz, M. Oliveira, V. Alves, P. Montenegro, R. Calçada
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      The present work focuses on the evaluation of the dynamic behavior of a centenary steel arch bridge, located in Portugal, under light railway traffic loads. This works aims to assess the dynamic behavior of the bridge subjected to an alternative type of railway vehicle, more specifically, a typical underground vehicle that is currently in service in the Lisbon Metro. The dynamic response of the system has been evaluated using two distinct methodologies, namely a moving loads model and a vehicle–bridge interaction model. To achieve this goal, finite element (FE) models from both the bridge and the vehicle have been developed and a comprehensive study has been carried to evaluate the influence of distinct factors in the dynamic response of the bridge–train system, namely the methodology used to assess the dynamic response, the location of the response reference point in the deck, the train speed and the vehicle configuration (single or double vehicle). Moreover, both the traffic safety, passenger comfort and pedestrian comfort have also been evaluated using normative criteria based on acceleration responses. The results shown that the normative limits related to traffic safety and passenger comfort were never exceeded in any condition analyzed in the study. However, the pedestrian comfort was jeopardized when the train speed exceeded 20[math]km/h.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-02-20T08:00:00Z
      DOI: 10.1142/S0219455421500577
       
  • Evaluation of Kriging-NARX Modeling for Uncertainty Quantification of
           Nonlinear SDOF Systems with Degradation
    • Authors: Xiaoshu Gao, Hetao Hou, Liang Huang, Guangquan Yu, Cheng Chen
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      Structural assessment for collapse is commonly approached by observing the failure or collapse of systems fully incorporating degradation. Challenges however exist in the performance indicator or damage measure due to compound impacts of uncertainties of external (seismic excitation) and internal (structural properties) characteristics with degradation behavior. To account for the impacts of uncertainties, the state-of-the-art kriging nonlinear autoregressive with exogenous (NARX) model is explored in this study to replicate the response of nonlinear single-degree-of-freedom systems. The generalized hysteretic Bouc-Wen model with internal uncertainties is selected to emulate the stiffness and strength degradation. A probabilistic stochastic ground motion model is introduced to represent the external uncertainties. The global terms of NARX model are selected by least-angle regression algorithm and the kriging model is utilized to surrogate uncertain parameters into corresponding NARX model coefficients. The predictions of kriging NARX models are further compared with that of the polynomial chaos nonlinear autoregressive with exogenous input form model as well as Monte Carlo simulation. The comparisons show that kriging NARX model presents an effective and efficient meta-model technique for uncertainty quantification of systems with degradation.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-02-20T08:00:00Z
      DOI: 10.1142/S0219455421500607
       
  • Analysis of Structural Vibrations of Vertical Axis Wind Turbine Blades via
           Hamilton’s Principle — Part 3: Pitch Angle and Equilibrium State
    • Authors: Jianyou Huang, Chia-Ou Chang, Chien-Cheng Chang
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      Pitch angle is one of the most important parameters of wind turbine blade. This study is aimed to investigate the effect of the pitch angle on the deformation of a VAWT. Lagrangian mechanics and Euler’s beam theory are used to derive the motion equations of linear structural vibration for straight blade vertical axis wind turbine blade with the pitch angle [math]. The complete equations of motion take account of the 4-DOF deformation of flexural–flexural–torsion–extension as well as the material damping. Vibration analysis of generalized displacement about the equilibrium state (GDAES) is carried out with respect to the displacement of the equilibrium state (DOES), which is separated from the motion of vibration. After simplifying the equilibrium equation of 4-DOF into 1-DOF system, the exact solution of displacement [math] of the equilibrium state is derived. The correction [math] of [math] due to the pitch angle and the characteristics of [math] with constant linear speed are analyzed. Furthermore, we investigate the coupling effect of lateral bending and axial extension of the blade on [math] is analyzed. Finally, the exact solution of [math] is verified by the central difference method.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-02-20T08:00:00Z
      DOI: 10.1142/S021945542150070X
       
  • Optimal Design of Dampers for Multi-Mode Cable Vibration Control Based on
           Genetic Algorithm
    • Authors: Fangdian Di, Lin Chen, Limin Sun
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      Cables in cable-stayed bridges are subjected to the problem of multi-mode vibrations. Particularly, the first ten modes of long cables can have a frequency less than 3[math]Hz and hence are vulnerable to wind-rain induced vibrations. In practice, mechanical dampers are widely used to mitigate such cable vibrations and thus they have to be designed to provide sufficient damping for all the concerned vibration modes. Meanwhile, the behaviors of practical dampers are complicated and better to be described by mechanical models with many parameters. Furthermore, additional mechanical components such as inerters and negative stiffness devices have been proposed to enhance the damper performance on cables. Therefore, it is increasingly difficult to optimize the damper parameters for suppressing multi-mode cable vibrations. To address this issue, this study proposes a novel damper design method based on the genetic algorithm (GA). The procedure of the method is first introduced where the damper performance optimization is formulated as a single-objective multi-parameter optimization problem. The effectiveness of the method is then verified by considering a viscous damper on a stay cable. Subsequently, the method is applied to optimize three typical dampers for cable vibration control, i.e. the positive stiffness damper, the negative stiffness damper, and the viscous inertial mass damper. The results show that the GA-based method is effective and efficient for cable damper design to achieve best multi-mode control effect and it is particularly useful for dampers with more parameters.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-02-19T08:00:00Z
      DOI: 10.1142/S0219455421500589
       
  • On Stability of SDOF Systems with Asymmetric Bi-Linear Hysteresis
           Subjected to Seismic Excitations
    • Authors: Patricio Quintana Gallo, Rodrigo Meneses
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      This technical note presents a numerical study on the stability of single degree of freedom (SDOF) systems with asymmetric bi-linear hysteretic restoring force, subjected to earthquake excitations. The aim is to report: (a) the existence of an unstable behavior in the response of such systems, under a specific ground motion, given small modifications of the yielding conditions of the hysteresis model, and (b) the introduction of a novel three-dimensional graphic visualization of the problem. The modifications of the yielding conditions were introduced via the symmetry-breaking produced by very small variations of the static equilibrium position of the system, equivalent to having an initial position and restoring force different from zero and symmetric yielding. The concise study comprises of nonlinear dynamic analyses of three system cases, one of them with symmetric (reference) and two with asymmetric yielding conditions. The results show that the system presented a stable response and severe ratcheting toward the weakest yielding direction for the symmetric and asymmetric cases, respectively. Differences as large as [math]% between the asymmetric and reference cases were obtained for the residual displacement of the systems, due to variations as small as [math]% in the static-equilibrium position, and consequent [math]% variations of the positive/negative yielding displacements and forces. In turn, negligible variations of the velocity between the three cases were predicted. To conclude, the paper introduces novel three-dimensional representations of the solution-curve and of the hysteresis cycles of the systems, deepening the discussion on the identified bifurcation. The 3D hysteresis curve, in particular, can be of much use for seismic engineering and mechanical studies, either numerical or experimental, as it allows visualizing the sequence of events in the hysteresis plots in a much clearer fashion compared to the traditional two-dimensional counterparts.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-02-19T08:00:00Z
      DOI: 10.1142/S0219455421710024
       
  • Nonlinear Traveling-Wave Vibration of a Ring-Stringer Stiffened
           Cylindrical Shell
    • Authors: Lun Liu, Shupeng Sun, Jiajie Han
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      The nonlinear traveling-wave vibration of a ring-stringer stiffened cylindrical shell is analyzed. Using Donnell’s nonlinear shell theory and Lagrange equations, the nonlinear dynamic model of the ring-stringer stiffened cylindrical shell is derived. Galerkin’s method based on multi-mode instead of single-mode approximation is used to discretize the shell’s displacements. Two types of orthogonal circumferential modes with same frequency are used and the interaction between them is considered in the analysis of the shell’s nonlinear traveling-wave vibration. The harmonic balance (HB) method, along with the pseudo-arc length continuation algorithm, is adopted to solve the forced vibration responses of the shell. The stability of the solution is determined by the Floquet theory. Through comparison with the results available in the literature, the correctness of the present nonlinear dynamic model and its solution process are validated first. Next, the mode selection rules are determined through a convergence study. Finally, the nonlinear traveling-wave vibration of the ring-stringer stiffened cylindrical shell is studied. Also, the paper investigates, in detail, the effects of stiffener parameters on the nonlinear dynamic characteristics of the stiffened shell.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-02-16T08:00:00Z
      DOI: 10.1142/S0219455421500590
       
  • A Computational Study on Buckling Behavior of Cold-Formed Steel Built-Up
           Columns Using Compound Spline Finite Strip Method
    • Authors: Akshay Mangal Mahar, S. Arul Jayachandran
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      This paper presents a computational methodology to compute the critical buckling stress of built-up cold-formed steel columns joined with discrete fasteners. The fasteners are modeled as three-dimensional beam elements, and their effect is integrated into the spline finite strip framework, evolving the compound strip methodology. Although this technique has been presented in the literature, this paper presents yet another robust framework for the buckling load evaluation of compound cold-formed steel columns with arbitrarily located fasteners. The proposed framework is applied to study the effect of fasteners on the formation of local, distortional, and global buckling modes of built-up section and a comparison is drawn with the buckling behavior of a single section. In this study, the proposed formulations are also used to get insights into the stability behavior of single-span and multi-span compound cold-formed steel columns in the presence of (i) fasteners with varied spacings with respect to span and (ii) the presence of the additional restraining system such as wall panels. For different buckling modes, a significant increment in buckling stress for a built-up section from a single section is observed when the fastener spacing is kept less than the critical buckling half-wavelength of the respective buckling modes. The study on the effect of wall panels shows that in comparison to unsheathed wall studs, the sheathed wall studs that produce additional constraints lead to the elimination of the global buckling deformations. The proposed formulations are simple, yet rigorous and have been validated using finite element-based numerical results.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-02-16T08:00:00Z
      DOI: 10.1142/S0219455421500644
       
  • Vibration Characteristics of Unsaturated Runways Under Moving Aircraft
           Loads
    • Authors: Chuxuan Tang, Zheng Lu, Hailin Yao, Shuan Guo, Yukun Han
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      The dynamic vibrations of airport runways induced by moving aircraft loads are semi-analytically studied in this paper. The airport runway consists of an infinite Kirchhoff plate, an elastic base course, and an unsaturated poroelastic half-space. The aircraft loads are modeled according to the mechanical properties of the main landing gear of the A380 civil airliner. The governing equations of the whole system are solved in the wavenumber domain using the double Fourier transform. Then the results in the spatial domain are obtained by applying the inverse double Fourier transform. Various parameters including the observation location, soil saturation, load speed, load frequency, and pavement rigidity on the vibration characters of the whole system are investigated. It is found that all these effects are crucial, and the increase of soil saturation leads to a larger maximum vertical displacement and lower critical speed.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-02-16T08:00:00Z
      DOI: 10.1142/S0219455421500656
       
  • A Computationally Efficient Method for Optimum Tuning of Single-Sided
           Pounding Tuned Mass Dampers for Structural Vibration Control
    • Authors: Yildirim Serhat Erdogan, Mehmet Ada
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      Pounding tuned mass dampers (PTMD), which relies on impact to dissipate vibration energy, have shown remarkable performance in suppressing structural vibrations with its modest design. However, the optimum design of PTMDs is computationally expensive due to non-smooth contact-impact behavior. This study provides a computationally efficient approach to determine the optimal parameters of single-sided PTMDs used in vibration control of structural systems. An optimization strategy is used to minimize the maximum response of the controlled structure. As is well-known, the calculation of the dynamic response of a structure could be cumbersome when conventional time-stepping techniques are used in each iteration of the optimization routine. Hence, an exact analytical solution of the steady-state vibration is used to calculate the response for different excitation frequencies, which substantially decreases the computational burden. The adopted method is computationally very inexpensive with respect to the conventional time-stepping techniques used to solve the nonlinear equations of motion to obtain response quantities. The exact solution only requires the solution of the system of five nonlinear equations in order to evaluate the steady-state response per each excitation frequency of harmonic force. A four-storey shear building is used to evaluate the optimally-tuned PTMD by the proposed procedure. In addition, simplified design equations for the coefficient of restitution and frequency ratio are provided using curve and surface fitting for preliminary design. It was shown that the effect of damping ratio of the primary structure on the optimal coefficient of restitution value is not considerable, while it has significant influence on the optimal frequency ratio. It was also realized that the objective function used in optimum parameter design has only one local optimum, which is suitable for the application of gradient-based optimization methods.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-02-10T08:00:00Z
      DOI: 10.1142/S0219455421500668
       
  • Optimal Placement of Sensors for Controlling Smart Base Isolation Systems
    • Authors: Mohtasham Mohebbi, Hamed Dadkhah
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      Smart base isolation composed of a low-damping base isolation and a supplemental magneto-rheological (MR) damper is one of the most effective semi-active control systems to protect the structures against earthquake. In this study, optimal placement of sensors is determined by using a mixed-integer genetic algorithm for best possible performance. The results show significant effect of sensor configuration on the control system performance, revealing that the sensor configuration should be taken as an important factor in design process of smart base isolation. Besides, although optimal determination of sensor placement improves the control system performance, a high number of sensors is needed to measure structure responses. A method using the least number of sensors is proposed in order to reduce the control cost. The results show the effectiveness of this method in achieving near-optimal response and reducing the control cost.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-02-05T08:00:00Z
      DOI: 10.1142/S0219455421500553
       
  • A Non-Iterative Integration Scheme Enriching the Solution to the Coupled
           Maglev Vehicle–Bridge System
    • Authors: Wei Liu, Wenhua Guo
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      A non-iterative integration scheme is presented in this study to enrich the solutions to the coupled equations of the maglev vehicle–bridge system. The proposed integration scheme is composed of two integration methods aiming at providing the solutions to equation of motion and state-space equation. First, the equation of motion of the simply supported girder bridge is transformed by the modal superposition method. Then the state-space equation is used to describe the motions of both the vehicle and the suspension control system, with the associated matrices assembled using the fully computerized approach. By adopting this integration scheme, only pure vector calculations arise in the solution process, regardless of the existence of time-dependent displacement and velocity on the right-hand sides of the two coupled equations. The proposed integration method is of the second-order accuracy with and without damping. Being equipped with adequate numerical dissipation and dispersion, the method also possesses the characteristic of little computing errors, as can be achieved through the use of different pairs of parameters. Finally, numerical simulations have been conducted to assess the influence of different feedback gains, three types of bridges with different lengths, and guideway irregularity on the maglev vehicle–bridge system.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-02-03T08:00:00Z
      DOI: 10.1142/S0219455421500528
       
  • Geometrically Nonlinear Electromechanical Instability of FG Nanobeams by
           Nonlocal Strain Gradient Theory
    • Authors: S. M. J. Hosseini, J. Torabi, R. Ansari, A. Zabihi
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      This paper is concerned with studying the size-dependent nonlinear dynamic pull-in instability and vibration of functionally graded Euler–Bernoulli nanobeams (FG-EBNs) with the von Kármán hypothesis based on the nonlocal strain gradient theory (NLSGT). To this end, the partial differential equation (PDE) is developed by Hamilton’s principle considering the intermolecular, fringing field and electrostatic nonlinear forces. Then, the Galerkin method (GM) is utilized to acquire the ordinary differential equation (ODE) and the results are obtained with the help of an analytical approach called the homotopy analysis method (HAM). To verify the outcome of this study, the nonlinear and linear frequencies obtained are compared with those of the literature. Consequently, the pull-in voltage of the FG nanobeam is obtained and the variations of nonlinear and linear frequencies are discussed in detail. Also, the effects of initial amplitude, electrostatic force, length scale, nonlocal parameter, material gradient index and boundary condition (BC) on the electromechanical behavior of FG-EBNs are analyzed with the results commented.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-02-01T08:00:00Z
      DOI: 10.1142/S0219455421500516
       
  • Indirect Damage Identification in Bridges Based on Dynamic Tyre Pressure
           Monitoring
    • Authors: G. Sai Kumar, C. G. Krishnanunni, B. N. Rao
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      This paper deals with an indirect health monitoring strategy for bridges using an instrumented vehicle. Thermodynamic principles are used to relate the change in Vehicle–Bridge-Interaction (VBI) forces to the change in dynamic tyre pressure. The damage identification process involves two stages. In the first stage, the unknown tyre model parameters are estimated using Bayesian inference based on the calibration data. The approach uses a Stein variational gradient descent implementation of the Bayes rule to quantify the uncertainty in the estimated tyre parameters. In the second stage, the calibrated tyre model is used to reconstruct the change in VBI force from measured tyre pressure data considering a damaged bridge. It is observed that damage present in the bridge produces notable changes in VBI force. Contour plots based on VBI force and natural frequency are developed for damage detection. The reconstructed VBI force change is used to quantify damage using the contour plots. Further, the least square estimation approach is adopted for damage identification by defining appropriate objective functions and imposing constraints on the damage indicators. The damage is estimated by minimizing the objective function using Cuckoo search algorithm. Numerical experiments reveal that the developed method could be used for accurate damage identification in the presence of measurement noise, uncertainty in estimated tyre parameters, and the uncertainty in bridge model parameters.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-02-01T08:00:00Z
      DOI: 10.1142/S0219455421500565
       
  • Optimal Time-Delay Control for Multi-Degree-of-Freedom Nonlinear Systems
           Excited by Harmonic and Wide-Band Noises
    • Authors: Rongchun Hu, Qiangfeng Lü
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      In this paper, an optimal time-delay control strategy is designed for multi-degree-of-freedom (multi-DOF) strongly nonlinear systems excited by harmonic and wide-band noises. First, by using the generalized harmonic functions, a stochastic averaging method (SAM) is employed for the time-delay controlled strongly nonlinear system under combined harmonic and wide-band noise excitations, by which a set of partially averaged Itô equations are obtained. Then, by solving the dynamical programming equation associated with the partially averaged Itô equations, the optimal control law can be obtained. Finally, by solving the Fokker–Planck–Kolmogorov (FPK) equation, the responses of the optimally time-delay controlled system are predicted. The analytical results are compared with the Monte Carlo simulation to verify the effectiveness and efficiency of the proposed control strategy.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-01-27T08:00:00Z
      DOI: 10.1142/S021945542150053X
       
  • Time-Varying Parameter Identification of Bridges Subject to Moving
           Vehicles Using Ridge Extraction Based on Empirical Wavelet Transform
    • Authors: Jiantao Li, Jian Guo, Xinqun Zhu
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      For a vehicle moving over a bridge, the vehicle-bridge interaction (VBI) embraces the time-varying modal parameters of the system. The identification of non-stationary characteristics of bridge responses due to moving vehicle load is important and remains a challenging task. A new method based on the improved empirical wavelet transform (EWT) along with ridge detection of signals in time-frequency representation (TFR) is proposed to estimate the instantaneous frequencies (IFs) of the bridge. Numerical studies are conducted using a VBI model to investigate the time-varying characteristics of the system. The effects of the measurement noise, road surface roughness and structural damage on the bridge IFs are investigated. Finally, the dynamic responses of an in-situ cable-stayed bridge subjected to a passing vehicle are analyzed to further explore the time varying characteristics of the VBI system. Numerical and experimental studies demonstrate the feasibility and effectiveness of the proposed method on the IF estimation. The identified IFs reveal important time-varying characteristics of the bridge dynamics that is significant to evaluating the actual performance of operational bridges in operation and may be used for structural health assessment.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-01-18T08:00:00Z
      DOI: 10.1142/S0219455421500462
       
  • Generative Adversarial Networks-Based Stochastic Approach to the Modeling
           of Individual Jumping Loads
    • Authors: Shuqian Duan, Jiecheng Xiong, Hui Qian
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      Features of jumping loads are essentially high-dimensional random variables but have been simplistically modeled owing to the lack of proper mathematical tools. Generative adversarial networks (GANs) in conjunction with deep learning technology are adopted herein for modeling the jumping loads. Conditional GANs (CGANs) combined with Wasserstein GANs (WGANs) with gradient penalty (WGANs-GP) are adopted in the impulse modeling, where a multi-layer perceptron and a convolutional neural network are employed for the discriminator and generator, respectively. As for the impulse amplitude sequence and interval sequence modeling, similar CGANs combined with WGANs-GP are adopted, where recurrent neural networks are employed for both the generator and discriminator. A large amount of measured individual jumping loads are utilized in training GANs to ensure the generated samples can simulate the real ones well. After training, the individual jumping loads are simulated by connecting the generated impulse samples, based on the generated impulse amplitude sequence samples and interval sequence samples. The simulated jumping loads can be used to assess the vibration performance of assembly structures, such as grandstands, concert halls, and gym floors. Moreover, the established GANs can be extended to the modeling of other stochastic dynamic excitations.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-01-18T08:00:00Z
      DOI: 10.1142/S0219455421500474
       
  • Experimental Study of the Effect of Proximity between Adjacent Buildings
           on their Dynamic Response
    • Authors: Gonzalo Barrios, Tam Larkin, Nawawi Chouw
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      Most of the experimental works on adjacent structures consider a short distance between them to analyze the interaction. Additionally, the majority of these studies focus on changes in the dynamic response of the buildings (e.g. acceleration, lateral displacement, or rocking) assuming that the fundamental frequency and the damping of the structures remain the same as those for the stand-alone case. This work intends to reveal the effect of distance on the interaction between adjacent structures and the effect of neighboring buildings on the dynamic properties of a structure. This was achieved by studying the dynamic response of single degree-of-freedom (SDOF) structures in a laminar box filled with sand sitting on a shake table. This study initially addressed the attenuation of the acceleration through the soil with the distance considering the structures at different distances. The second part of the study considers multiple configurations of adjacent structures to estimate the influence of the number of neighbors on the fundamental frequency and damping ratio of a subject building. An increasing fundamental frequency with an increasing number of participating structures was observed. An equation to estimate the influence of the number of neighboring buildings on the fundamental frequency of the subject structure is proposed. For the damping ratio, a considerable influence of the soil was observed. The lowest damping was obtained for an intermediate number of structures.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-01-18T08:00:00Z
      DOI: 10.1142/S0219455421500486
       
  • Nonlinear Behaviors of Spinning Pipes Conveying Fluid with Pulsation
    • Authors: Morteza Khoshroo, Mojtaba Eftekhari
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      Bifurcation analysis is conducted to investigate the dynamics of a spinning pipe conveying fluid with pulsation. The partial differential equations of the system are obtained by considering the nonlinearity in curvature and inertia. They are then discretized to the ordinary differential equations by means of the Galerkin expansion so that the primary and combination resonance conditions are imposed to the system. Moreover, the multiple scales method is utilized to solve the resultant equations, and the stability of the equilibrium points of the system is determined through the continuation method. The equilibrium solutions are also examined by the numerical integration, by which the existence of double jump, saddle node and Hopf bifurcations are demonstrated for different values of the fluid velocity.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-01-18T08:00:00Z
      DOI: 10.1142/S0219455421500504
       
  • Free Vibrations of Steel–Concrete Composite Beams by the Dynamic
           Direct Stiffness Method
    • Authors: Qikai Sun, Nan Zhang, Xiao Liu, Xiaoyan Tao
      Abstract: International Journal of Structural Stability and Dynamics, Ahead of Print.
      A new dynamic direct stiffness method for analyzing the natural vibration characteristics of steel–concrete composite beams (SCCBs) is proposed, which considers the effect of partial interaction between the interface of the concrete slab and steel beam. The advantage of the method is that exact solutions can be obtained due to no introduction of approximated displacement and/or force fields in the derivation. Besides, the method is especially useful for the dynamic analysis of SCCBs with axial variable stiffness under four common boundary conditions. The proposed method is validated by comparing with the theoretical and experimental results available in the literature. Finally, the effects of different boundary conditions, shear connection, cross-sectional stiffness ratio, and other parameters upon the frequencies of the beam are discussed in detail.
      Citation: International Journal of Structural Stability and Dynamics
      PubDate: 2021-01-09T08:00:00Z
      DOI: 10.1142/S0219455421500498
       
 
JournalTOCs
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
Email: journaltocs@hw.ac.uk
Tel: +00 44 (0)131 4513762
 


Your IP address: 3.238.71.80
 
Home (Search)
API
About JournalTOCs
News (blog, publications)
JournalTOCs on Twitter   JournalTOCs on Facebook

JournalTOCs © 2009-