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  Subjects -> ENGINEERING (Total: 2358 journals)
    - CHEMICAL ENGINEERING (201 journals)
    - CIVIL ENGINEERING (192 journals)
    - ELECTRICAL ENGINEERING (107 journals)
    - ENGINEERING (1240 journals)
    - ENGINEERING MECHANICS AND MATERIALS (394 journals)
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CIVIL ENGINEERING (192 journals)                     

Showing 1 - 194 of 194 Journals sorted alphabetically
ACI Structural Journal     Full-text available via subscription   (Followers: 20)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 3)
Acta Structilia : Journal for the Physical and Development Sciences     Open Access   (Followers: 2)
Advances in Civil Engineering     Open Access   (Followers: 37)
Advances in Structural Engineering     Full-text available via subscription   (Followers: 31)
Agregat     Open Access   (Followers: 1)
Ambiente Construído     Open Access   (Followers: 1)
American Journal of Civil Engineering and Architecture     Open Access   (Followers: 33)
Architectural Engineering     Open Access   (Followers: 5)
Archives of Civil and Mechanical Engineering     Full-text available via subscription   (Followers: 2)
Archives of Civil Engineering     Open Access   (Followers: 12)
Archives of Hydro-Engineering and Environmental Mechanics     Open Access   (Followers: 2)
ATBU Journal of Environmental Technology     Open Access   (Followers: 4)
Australian Journal of Structural Engineering     Full-text available via subscription   (Followers: 6)
Baltic Journal of Road and Bridge Engineering     Full-text available via subscription   (Followers: 1)
BER : Building and Construction : Full Survey     Full-text available via subscription   (Followers: 9)
BER : Building Contractors' Survey     Full-text available via subscription   (Followers: 2)
BER : Building Sub-Contractors' Survey     Full-text available via subscription   (Followers: 2)
BER : Survey of Business Conditions in Building and Construction : An Executive Summary     Full-text available via subscription   (Followers: 3)
Bioinspired Materials     Open Access   (Followers: 5)
Bridge Structures : Assessment, Design and Construction     Hybrid Journal   (Followers: 14)
Building & Management     Open Access   (Followers: 1)
Building and Environment     Hybrid Journal   (Followers: 15)
Building Women     Full-text available via subscription  
Built Environment Project and Asset Management     Hybrid Journal   (Followers: 14)
Bulletin of Pridniprovsk State Academy of Civil Engineering and Architecture     Open Access   (Followers: 6)
Canadian Journal of Civil Engineering     Hybrid Journal   (Followers: 13)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 6)
Case Studies in Nondestructive Testing and Evaluation     Open Access   (Followers: 11)
Case Studies in Structural Engineering     Open Access   (Followers: 9)
Cement and Concrete Composites     Hybrid Journal   (Followers: 19)
Challenge Journal of Concrete Research Letters     Open Access   (Followers: 3)
Challenge Journal of Structural Mechanics     Open Access   (Followers: 6)
Change Over Time     Full-text available via subscription   (Followers: 2)
Civil and Environmental Engineering     Open Access   (Followers: 8)
Civil And Environmental Engineering Reports     Open Access   (Followers: 7)
Civil and Environmental Research     Open Access   (Followers: 17)
Civil Engineering = Siviele Ingenieurswese     Full-text available via subscription   (Followers: 4)
Civil Engineering and Architecture     Open Access   (Followers: 21)
Civil Engineering and Environmental Systems     Hybrid Journal   (Followers: 3)
Civil Engineering and Technology     Open Access   (Followers: 11)
Civil Engineering Dimension     Open Access   (Followers: 10)
Civil Engineering Infrastructures Journal     Open Access   (Followers: 1)
Cohesion and Structure     Full-text available via subscription   (Followers: 2)
Composite Structures     Hybrid Journal   (Followers: 272)
Computer-aided Civil and Infrastructure Engineering     Hybrid Journal   (Followers: 11)
Computers & Structures     Hybrid Journal   (Followers: 38)
Concrete Research Letters     Open Access   (Followers: 7)
Construction Economics and Building     Open Access   (Followers: 4)
Construction Engineering     Open Access   (Followers: 11)
Construction Management and Economics     Hybrid Journal   (Followers: 21)
Construction Science     Open Access   (Followers: 5)
Constructive Approximation     Hybrid Journal  
Curved and Layered Structures     Open Access   (Followers: 3)
DFI Journal : The Journal of the Deep Foundations Institute     Hybrid Journal   (Followers: 1)
Earthquake Engineering and Structural Dynamics     Hybrid Journal   (Followers: 17)
Enfoque UTE     Open Access   (Followers: 4)
Engineering Project Organization Journal     Hybrid Journal   (Followers: 7)
Engineering Structures     Hybrid Journal   (Followers: 13)
Engineering Structures and Technologies     Hybrid Journal   (Followers: 2)
Engineering, Construction and Architectural Management     Hybrid Journal   (Followers: 10)
Environmental Geotechnics     Hybrid Journal   (Followers: 5)
European Journal of Environmental and Civil Engineering     Hybrid Journal   (Followers: 9)
Fatigue & Fracture of Engineering Materials and Structures     Hybrid Journal   (Followers: 17)
Frattura ed Integrità Strutturale : Fracture and Structural Integrity     Open Access  
Frontiers in Built Environment     Open Access  
Frontiers of Structural and Civil Engineering     Hybrid Journal   (Followers: 6)
Geomaterials     Open Access   (Followers: 3)
Geosystem Engineering     Hybrid Journal   (Followers: 1)
Geotechnik     Hybrid Journal   (Followers: 3)
Géotechnique Letters     Hybrid Journal   (Followers: 7)
GISAP : Technical Sciences, Construction and Architecture     Open Access  
HBRC Journal     Open Access   (Followers: 2)
Hormigón y Acero     Full-text available via subscription  
HVAC&R Research     Hybrid Journal  
Indonesian Journal of Urban and Environmental Technology     Open Access  
Indoor and Built Environment     Hybrid Journal   (Followers: 2)
Infrastructure Asset Management     Hybrid Journal   (Followers: 2)
Infrastructures     Open Access  
Ingenio Magno     Open Access   (Followers: 1)
Insight - Non-Destructive Testing and Condition Monitoring     Full-text available via subscription   (Followers: 29)
International Journal for Service Learning in Engineering     Open Access  
International Journal of 3-D Information Modeling     Full-text available via subscription   (Followers: 3)
International Journal of Advanced Structural Engineering     Open Access   (Followers: 17)
International Journal of Civil, Mechanical and Energy Science     Open Access   (Followers: 1)
International Journal of Concrete Structures and Materials     Open Access   (Followers: 15)
International Journal of Condition Monitoring     Full-text available via subscription   (Followers: 2)
International Journal of Construction Engineering and Management     Open Access   (Followers: 10)
International Journal of Geo-Engineering     Open Access   (Followers: 3)
International Journal of Geosynthetics and Ground Engineering     Full-text available via subscription   (Followers: 4)
International Journal of Masonry Research and Innovation     Hybrid Journal   (Followers: 1)
International Journal of Pavement Research and Technology     Open Access   (Followers: 6)
International Journal of Protective Structures     Hybrid Journal   (Followers: 6)
International Journal of Steel Structures     Hybrid Journal   (Followers: 2)
International Journal of Structural Engineering     Hybrid Journal   (Followers: 8)
International Journal of Structural Integrity     Hybrid Journal   (Followers: 2)
International Journal of Structural Stability and Dynamics     Hybrid Journal   (Followers: 7)
International Journal of Sustainable Built Environment     Open Access   (Followers: 5)
International Journal of Sustainable Construction Engineering and Technology     Open Access   (Followers: 8)
International Journal on Pavement Engineering & Asphalt Technology     Open Access   (Followers: 7)
International Journal Sustainable Construction & Design     Open Access   (Followers: 1)
Journal of Bridge Engineering     Full-text available via subscription   (Followers: 14)
Journal of Building Engineering     Hybrid Journal   (Followers: 1)
Journal of Building Materials and Structures     Open Access   (Followers: 2)
Journal of Building Performance Simulation     Hybrid Journal   (Followers: 7)
Journal of Civil Engineering and Construction Technology     Open Access   (Followers: 14)
Journal of Civil Engineering and Management     Hybrid Journal   (Followers: 7)
Journal of Civil Engineering and Science     Open Access   (Followers: 9)
Journal of Civil Engineering Research     Open Access   (Followers: 7)
Journal of Civil Engineering, Science and Technology     Open Access   (Followers: 1)
Journal of Civil Society     Hybrid Journal   (Followers: 4)
Journal of Civil Structural Health Monitoring     Hybrid Journal   (Followers: 4)
Journal of Composites     Open Access   (Followers: 80)
Journal of Composites for Construction     Full-text available via subscription   (Followers: 13)
Journal of Computing in Civil Engineering     Full-text available via subscription   (Followers: 23)
Journal of Construction Engineering     Open Access   (Followers: 8)
Journal of Construction Engineering and Management     Full-text available via subscription   (Followers: 18)
Journal of Constructional Steel Research     Hybrid Journal   (Followers: 6)
Journal of Earth Sciences and Geotechnical Engineering     Open Access   (Followers: 4)
Journal of Fluids and Structures     Hybrid Journal   (Followers: 6)
Journal of Frontiers in Construction Engineering     Open Access   (Followers: 2)
Journal of Green Building     Full-text available via subscription   (Followers: 10)
Journal of Highway and Transportation Research and Development (English Edition)     Full-text available via subscription   (Followers: 14)
Journal of Infrastructure Systems     Full-text available via subscription   (Followers: 19)
Journal of Legal Affairs and Dispute Resolution in Engineering and Construction     Full-text available via subscription   (Followers: 5)
Journal of Marine Science and Engineering     Open Access   (Followers: 1)
Journal of Materials and Engineering Structures     Open Access   (Followers: 5)
Journal of Materials in Civil Engineering     Full-text available via subscription   (Followers: 7)
Journal of Nondestructive Evaluation     Hybrid Journal   (Followers: 9)
Journal of Performance of Constructed Facilities     Full-text available via subscription   (Followers: 3)
Journal of Pipeline Systems Engineering and Practice     Full-text available via subscription   (Followers: 6)
Journal of Rehabilitation in Civil Engineering     Open Access   (Followers: 3)
Journal of Solid Waste Technology and Management     Full-text available via subscription   (Followers: 1)
Journal of Structural Engineering     Full-text available via subscription   (Followers: 36)
Journal of Structural Fire Engineering     Full-text available via subscription   (Followers: 6)
Journal of Sustainable Architecture and Civil Engineering     Open Access   (Followers: 3)
Journal of Sustainable Design and Applied Research in Innovative Engineering of the Built Environment     Open Access   (Followers: 1)
Journal of the Civil Engineering Forum     Open Access  
Journal of the South African Institution of Civil Engineering     Open Access   (Followers: 2)
Journal of Water and Environmental Nanotechnology     Open Access  
Jurnal Spektran     Open Access   (Followers: 1)
Jurnal Teknik Sipil dan Perencanaan     Open Access   (Followers: 1)
Konstruksia     Open Access  
KSCE Journal of Civil Engineering     Hybrid Journal   (Followers: 2)
Latin American Journal of Solids and Structures     Open Access   (Followers: 4)
Materiales de Construcción     Open Access   (Followers: 1)
Mathematical Modelling in Civil Engineering     Open Access   (Followers: 4)
Nondestructive Testing And Evaluation     Hybrid Journal   (Followers: 15)
npj Materials Degradation     Open Access  
Obras y Proyectos     Open Access   (Followers: 1)
Open Journal of Civil Engineering     Open Access   (Followers: 9)
Photonics and Nanostructures - Fundamentals and Applications     Hybrid Journal   (Followers: 3)
Practice Periodical on Structural Design and Construction     Full-text available via subscription   (Followers: 3)
Proceedings of the Institution of Civil Engineers - Bridge Engineering     Hybrid Journal   (Followers: 8)
Proceedings of the Institution of Civil Engineers - Civil Engineering     Hybrid Journal   (Followers: 13)
Proceedings of the Institution of Civil Engineers - Management, Procurement and Law     Hybrid Journal   (Followers: 9)
Proceedings of the Institution of Civil Engineers - Municipal Engineer     Hybrid Journal   (Followers: 2)
Proceedings of the Institution of Civil Engineers - Structures and Buildings     Hybrid Journal   (Followers: 3)
Promet : Traffic &Transportation     Open Access  
Random Structures and Algorithms     Hybrid Journal   (Followers: 5)
Research in Nondestructive Evaluation     Hybrid Journal   (Followers: 6)
Revista IBRACON de Estruturas e Materiais     Open Access   (Followers: 1)
Road Materials and Pavement Design     Hybrid Journal   (Followers: 11)
Russian Journal of Nondestructive Testing     Hybrid Journal   (Followers: 5)
Science and Engineering of Composite Materials     Hybrid Journal   (Followers: 61)
Selected Scientific Papers - Journal of Civil Engineering     Open Access   (Followers: 3)
Slovak Journal of Civil Engineering     Open Access   (Followers: 2)
Soils and foundations     Full-text available via subscription   (Followers: 5)
Steel Construction - Design and Research     Hybrid Journal   (Followers: 4)
Structural and Multidisciplinary Optimization     Hybrid Journal   (Followers: 10)
Structural Concrete     Hybrid Journal   (Followers: 11)
Structural Control and Health Monitoring     Hybrid Journal   (Followers: 8)
Structural Engineering International     Full-text available via subscription   (Followers: 11)
Structural Mechanics of Engineering Constructions and Buildings     Open Access   (Followers: 1)
Structural Safety     Hybrid Journal   (Followers: 6)
Structural Survey     Hybrid Journal  
Structure     Full-text available via subscription   (Followers: 24)
Structure and Infrastructure Engineering: Maintenance, Management, Life-Cycle Design and Performance     Hybrid Journal   (Followers: 12)
Structures     Hybrid Journal   (Followers: 1)
Study of Civil Engineering and Architecture     Open Access   (Followers: 10)
Superlattices and Microstructures     Hybrid Journal   (Followers: 2)
Surface Innovations     Hybrid Journal  
Technical Report Civil and Architectural Engineering     Open Access   (Followers: 1)
Teknik     Open Access  
The IES Journal Part A: Civil & Structural Engineering     Hybrid Journal   (Followers: 6)
The Structural Design of Tall and Special Buildings     Hybrid Journal   (Followers: 5)
Thin Films and Nanostructures     Full-text available via subscription   (Followers: 2)
Thin-Walled Structures     Hybrid Journal   (Followers: 4)
Transactions of the VŠB - Technical University of Ostrava. Construction Series     Open Access   (Followers: 1)
Transportation Geotechnics     Full-text available via subscription   (Followers: 1)
Transportation Infrastructure Geotechnology     Hybrid Journal   (Followers: 8)
Underground Space     Open Access  
Water Science & Technology     Partially Free   (Followers: 25)
Water Science and Technology : Water Supply     Partially Free   (Followers: 22)

           

Journal Cover Journal of Civil Structural Health Monitoring
  [SJR: 0.296]   [H-I: 7]   [4 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 2190-5452 - ISSN (Online) 2190-5479
   Published by Springer-Verlag Homepage  [2351 journals]
  • JCSHM: invaluable resource for practice of civil structural health
           monitoring
    • Authors: Farhad Ansari
      Pages: 1 - 1
      PubDate: 2018-01-01
      DOI: 10.1007/s13349-018-0271-x
      Issue No: Vol. 8, No. 1 (2018)
       
  • 3D numerical modeling of multi-channel analysis of surface wave in
           homogeneous and layered concrete slabs
    • Authors: Hossein Rahnema; Reza Bahman Bijari
      Pages: 161 - 170
      Abstract: The surface wave method has recently gained popularity in engineering issues for determining homogeneity in depth profiles of media consisting of huge concrete structures. This paper extends a 3D numerical modeling of an experimental seismic surface wave study on the investigation of concrete layering properties. Furthermore, the homogeneity, quality and layering of two large concrete slabs which were experimentally examined by some non-destructive seismic tests are conducted using the ABAQUS/Explicit finite element software, which is efficient for this purpose. To simulate an infinite media, special elements are used in the boundary named absorbing layer using increasing damping to eliminate sufficient reflections from the fictatus boundary. Rayleigh waves were identified using Lamb wave fundamental-modes; then, dispersion curves were numerically studied for the sake of comparison with the experimental results. Consequently, to see the agreement of finite element simulations with experiments, from the gathered records at the free surface of the layered slab, the comparison between the estimated and the average measured Young’s moduli of all concrete slab layers according to their thicknesses is conducted in the simulation and a reliable estimation with an error less than 3% is observed.
      PubDate: 2018-01-01
      DOI: 10.1007/s13349-017-0264-1
      Issue No: Vol. 8, No. 1 (2018)
       
  • Dynamic characterisation of a historic bell-tower using a
           sensitivity-based technique for model tuning
    • Authors: Massimiliano Ferraioli; Lorenzo Miccoli; Donato Abruzzese
      Abstract: The most relevant results of the vibration-based investigations performed on a historic masonry tower in Italy namely the Santa Maria a Vico bell-tower is here presented. The first part of the study involves preliminary full-scale ambient vibration measurements in operational conditions and dynamics-based finite element (FE) modelling. At first, a manual tuning of the uncertain parameters of the model was carried out to adjust material properties, soil-structure interaction and constraining effect of the neighbouring structures. Then, based on the sensitivity analysis, only the most sensitive parameters were chosen as updating parameters. Finally, a model updating technique based on a sensitivity-based method was used to minimise the error between experimental vibration data and numerical response values. To this aim, a residual vector defined as the weighted difference between the measured quantities and calculated quantities was used. The uncertain structural parameters of the FE model were identified by minimising a robust penalty function. The calibrated model was used as an important tool for the seismic assessment of the structure using pushover analysis. Since the assumed value of the masonry compressive strength is the most sensitive parameter of non-linear behaviour, a sensitivity analysis was performed considering reference values in the range of interest. The seismic safety corresponding to increasing levels of the seismic hazard was finally investigated.
      PubDate: 2018-02-14
      DOI: 10.1007/s13349-018-0272-9
       
  • Modelling techniques for structural evaluation for bridge assessment
    • Authors: Shojaeddin Jamali; Tommy H. T. Chan; Andy Nguyen; David P. Thambiratnam
      Abstract: Load assessment of existing bridges in Australia is evaluated mainly using beam line model and the grillage analogy to examine the structural integrity of bridge components due to live loadings. With the majority of existing bridge networks designed for superseded design vehicular loading, the necessity to utilise more rigorous analysis methods to assess the load effects of bridges is indispensable. In this paper, various vehicular loading cases on a grillage model of a box girder bridge and its equivalent finite element model (FE) are considered, and their applicability for bridge assessment using structural health monitoring (SHM) as defined in the new revision of AS 5100.7 is studied. Based on numerical analyses, it was observed that component-level load effects in the two models have notable differences, irrespective of vehicle speed, position and loading. However, when global-level load responses are compared, the discrepancy in analysis outputs drops dramatically. The modelling ratios developed in this paper are practical and will be applicable with any modelling techniques for bridge assessment under vehicular loading on both a global and component-response basis. It was also observed that FE is more efficient in terms of model updating and damage simulation, and hence more appropriate for implementation of SHM techniques. The proposed flowchart suggested for heavy load assessment incorporates detailed and simple modelling approaches aligned with experimental data obtained by SHM techniques, which can be used for periodic and long-term monitoring of bridges. It can enhance the proper determination of bridge condition states, as any conservative estimation of bridge capacity may result in unnecessary load limitations.
      PubDate: 2018-02-06
      DOI: 10.1007/s13349-018-0269-4
       
  • Structural identification of a tied arch bridge using parallel genetic
           algorithms and ambient vibration monitoring with a wireless sensor network
           
    • Authors: Matthew Whelan; Neal Salas Zamudio; Timothy Kernicky
      Abstract: Structural identification has received increased attention as an applied technique for performance-based assessment of large civil structures by providing a means to improve the correlation of simulated responses in numerical models to experimental measurements of actual behavior under in-service conditions. This paper presents the application of structural identification to a large set of modal parameter estimates obtained through ambient vibration monitoring of a tied arch bridge with a wireless sensor network facilitating high-rate, real-time vibration measurement over 48 measurement channels. Model updating of a finite element model of the span is achieved through global optimization of an objective function using an integer-constrained genetic algorithm implemented on a parallel computing cluster to facilitate the use of large population sizes. The influence of the number of modes included in the objective function and the number of uncertain parameters included in the optimization are explored for this real-world application. The results highlight the capability of the genetic algorithm to achieve an exceptionally strong correlation between the calibrated finite element model and the experimentally measured natural frequencies and mode shapes over a large set of modal parameter estimates. However, variations observed in the parameter solutions, identified as the number of uncertain parameters updated and modes included in the objective function are varied, serve to highlight the challenges associated with reliable parameter estimation in structural identification using classical optimization-based approaches.
      PubDate: 2018-01-25
      DOI: 10.1007/s13349-017-0266-z
       
  • Health assessment and ambient vibration testing of the “Ponte delle
           
    • Authors: Ivan Roselli; Marialaura Malena; Marialuisa Mongelli; Nicola Cavalagli; Massimiliano Gioffrè; Gerardo De Canio; Gianmarco de Felice
      Abstract: The Ponte delle Torri is a large medieval masonry bridge, one of the main architectural heritage of Spoleto, Italy. The location of the bridge is less than 50 km from the main epicenters of the recent Central Italy earthquakes (Mw > 5.0) that occurred between August 2016 and February 2017. In addition, some minor quakes of the sequence (Mw between 3.0 and 4.0) occurred within 10 km from the bridge, causing some damages and fear among the population around Spoleto. In this context, the present paper aims at contributing to understand the effects on the structural health of the bridge by analyzing the ambient vibration data acquired before, during and after the seismic sequence, as changes in the dynamic behavior of the structure might indicate the evolution of the state of damage of the monument. In particular, vibration data were processed by modal analysis techniques for mutual validation of the extracted modal parameters. Environmental and vibration data were simultaneously acquired to take into account the seasonal effects on the dynamic behavior. Through a preliminary finite-element model (FEM) the modal shapes were obtained to choose the positions where to locate the sensors for the vibration spot acquisition session of June 2015. The same positions were acquired in October 2016 and at the end of May 2017. Subsequently, a more detailed FEM was produced based on a 3D reconstruction by structure-from-motion stereo-photogrammetry technique with high-resolution photos from unmanned aerial vehicle of the bridge. The model was validated through comparison with the damage pattern experienced by the bridge and then used for assessing the seismic safety by means of both, nonlinear dynamic and static push-over analyses.
      PubDate: 2018-01-24
      DOI: 10.1007/s13349-018-0268-5
       
  • Detection of mortar defects in ballastless tracks of high-speed railway
           using transient elastic wave method
    • Authors: Xiushu Tian; Weigang Zhao; Yanliang Du; Baoxian Wang
      Abstract: In the multi-layered track structure, the defects of cement-emulsified asphalt (CA) mortar are hidden and difficult to detect. There is still no effective detection method yet. Thus, this paper discusses the feasibility of mortar defect detection by transient elastic wave method. First, a finite-element model (FEM) was created by the LS-DYNA for a section of the multi-layered structure of the ballastless tracks, and the features of elastic waves were investigated in ballastless tracks with and without defects. Then, three identification parameters were presented and the spectra of measuring points were analysed in detail. Moreover, the IE method was adopted to detect the defects in the entity models of ballastless tracks. It is shown that the internal defects of the mortar layer can be pinpointed by comparing the waveforms of various frequencies in the frequency domain, different peaks of resonance frequency, and diverse power density values.
      PubDate: 2017-12-20
      DOI: 10.1007/s13349-017-0265-0
       
  • Efficiency investigation of structural interventions based on in situ
           ambient vibration measurements on Acheiropoietos Early Byzantine basilica,
           Thessaloniki, Greece
    • Authors: Thomas Salonikios; Nikolaos Theodoulidis; Konstantinos Morfidis; Georgia Zacharopoulou; Konstantinos Raptis
      Abstract: Acheiropoietos in its current state is a typical Early Byzantine three-aisled timber-roofed basilica with narthex and galleries. During the destructive earthquake of June 20, 1978, the basilica suffered significant damage. In the following years, ambient vibration measurements were performed at the damaged structure before any intervention and main eigenperiods of vibration were calculated. In 1990s, an extensive structural restoration project was undertaken aiming at the provision of diaphragms of controlled shear strength and rigidity at the level of the timber floors and roofs of the galleries. Horizontal steel frames were placed at the perimeter of these diaphragms providing the required diaphragmatic response. The interventions were intended to support the long north and south walls and galleries of the basilica by its stiffer east and west walls against horizontal actions. Within the framework of the present study, the efficiency of the interventions to achieve the desired diaphragmatic response was investigated by measuring the structure’s response to ambient vibration. The in situ measurements and the postprocessing data document that the timber diaphragms are actually behaving as rigid levels. Therefore, it is concluded that the implemented interventions on the basilika assure its proper diaphragmatic function, improving thus successfully its dynamic behavior in future earthquake excitations, according to the redesigned structural approach.
      PubDate: 2017-12-12
      DOI: 10.1007/s13349-017-0262-3
       
  • Final outcomes on the multi-disciplinary long-term monitoring and
           preservation state investigation on the medieval external Façades of
           Palazzo Ducale in Venice, Italy
    • Authors: Francesca Sciarretta; Fabrizio Antonelli; Fabio Peron; Silvia Caniglia
      Abstract: The paper presents the results of the research and monitoring activities carried out at Palazzo Ducale in Venice, Italy, between 2009 and 2014. A team of academic and technical personnel of the Iuav University designed and carried on the programme. The aim was to acquire knowledge and data to establish a clear picture of the preservation state of the two XIV–XV Century external façades (South and West). The size of the façades, their complex and uncertain consistency, as well as their long and complicated history dictated the choice of multi-disciplinary, integrated and nondestructive methodologies. In detail, the diagnostics consisted of static monitoring of cracks and rotation, dynamic monitoring along a critical vertical section, sonic wave velocity measurements, endoscopic probing and ground penetrating radar, infrared thermographic imaging and finally mineralogical and petro-physical analyses of stone samples. Other information from visual and geometric surveys, bibliographic research and conventional calculations supported the results of the diagnostic procedures. The outcomes of the programme enlightened specific conclusions for each activity as well as crossing multi-disciplinary points of view; the latter are about the quality and consistency of the load-bearing masonry, the stress state in the façade walls and the potentially critical issues. As a specific objective, optimization of the available knowledge besides test results could finally be reached. The outcomes could update the scientific knowledge basis and support maintenance provisions for this unique and world-famous monument.
      PubDate: 2017-12-12
      DOI: 10.1007/s13349-017-0263-2
       
  • Review of machine-vision based methodologies for displacement measurement
           in civil structures
    • Authors: Yan Xu; James M. W. Brownjohn
      Abstract: Vision-based systems are promising tools for displacement measurement in civil structures, possessing advantages over traditional displacement sensors in instrumentation cost, installation efforts and measurement capacity in terms of frequency range and spatial resolution. Approximately one hundred papers to date have appeared on this subject, investigating topics like system development and improvement, the viability on field applications and the potential for structural condition assessment. The main contribution of this paper is to present a literature review of vision-based displacement measurement, from the perspectives of methodologies and applications. Video-processing procedures in this paper are summarised as a three-component framework: camera calibration, target tracking and structural displacement calculation. Methods for each component are presented in principle, with discussions about the relative advantages and limitations. Applications in the two most active fields, bridge deformation and cable vibration measurement, are examined followed by a summary of field challenges observed in monitoring tests. Important gaps requiring further investigation are presented, e.g. robust tracking methods, non-contact sensing and measurement accuracy evaluation in field conditions.
      PubDate: 2017-12-01
      DOI: 10.1007/s13349-017-0261-4
       
  • Continuous monitoring of a challenging heritage tower in Monza, Italy
    • Authors: Antonella Saisi; Carmelo Gentile; Antonello Ruccolo
      Abstract: A recent survey of the historic complex of “Santa Maria del Carrobiolo” in Monza (Italy) highlighted that two sides of the bell-tower are directly supported by the load-bearing walls of the apse and South aisle of the neighbouring church. After the discovery of the weak structural arrangement of the building, a network of 10 displacement transducers, integrated by five temperature sensors, was installed in the tower to check the opening variation of the main cracks. Subsequently, ambient vibration tests were performed and closely spaced modes with similar mode shapes were clearly identified: since the dynamic characteristics of the tower are quite different from those obtained in past experimental studies of similar structures and conceivably related to the construction sequence, a simple dynamic monitoring system was installed in the tower to complete the health monitoring aimed at the preservation of the historic structure. The paper—after a brief description of the tower and a summary of selected evidences provided by on-site survey, historic research and static monitoring—focuses on the dynamic characteristics identified in the preliminary ambient vibration tests and the main results of 1-year dynamic monitoring. In order to assess the effects of changing temperature on the natural frequencies of the investigated tower, especially in view of the removal of those effects needed for an effective performance assessment, simple correlation studies between modal frequencies and temperature are presented and discussed.
      PubDate: 2017-11-29
      DOI: 10.1007/s13349-017-0260-5
       
  • Evaluation of one hundred and one instrumented bridges suggests a new
           level of inspection should be established in the bridge design codes
    • Authors: Baidar Bakht; Aftab Mufti
      PubDate: 2017-11-20
      DOI: 10.1007/s13349-017-0256-1
       
  • Toward effective structural identification of medium-rise building
           structures
    • Authors: A. Nguyen; K. A. T. L. Kodikara; T. H. T. Chan; D. P. Thambiratnam
      Abstract: Structural Identification (St-Id) is the process of constructing and calibrating a physics-based model based on the measured static and/or dynamic response of the structure. Over the last two decades, although the St-Id methods have become increasingly popular amongst civil–structural engineering communities, most complete and successful applications are often found with flexible structures such as long-span bridges and towers. Very few comprehensive studies were reported on building structures, especially those with medium-rise characteristics which are often associated with complicated analytical modelling and different degrees of parameter uncertainties. To address this need, this paper presents an in-depth study on St-Id of a benchmark medium-rise building firstly demonstrating the importance of developing appropriate initial analytical models that can be used for the automated model calibration techniques. Then, a novel parametric study-based sensitivity analysis approach is introduced to identify tuning parameters as well as their appropriate ranges to maximise the correlation of the calibrated model whilst preserving the physical relevance of the calibrated model. Modal data of the first few modes measured under ambient vibration conditions are used in this study. Further application of the St-Id process developed herein for structural health monitoring (SHM) of buildings is also discussed.
      PubDate: 2017-11-20
      DOI: 10.1007/s13349-017-0259-y
       
  • Effect of central and non-central frequency components on the quality of
           damage imaging
    • Authors: Gnana Teja Pudipeddi; Ching-Tai Ng; Andrei Kotousov
      Abstract: Accurate image reconstruction of damage through Lamb wave diffraction tomography (LWDT) requires substantial information of scatter field. This can be achieved using transducer network to collect the scatter field data. However, this requires a large number of transducers that creates logistical constraints for the practical applications of the technique. Various methods have been developed to improve the practicability of LWDT. One of the main approaches is to employ data at multiple frequencies within the bandwidth of the excitation signal. The objective of this study is to investigate the performance of using the data at non-central frequencies to reconstruct the damage image using LWDT. This provides an understanding on the influence of data at each individual frequency in the damage image reconstruction.In this paper, a series of numerical case studies with consideration of different damage sizes and shapes are carried out. Different non-central frequencies data is used to reconstruct the damage image. The results show that using the data at different non-central frequencies leads to different qualities of the reconstructed damage images. The quality of these reconstructed damage images are then compared to investigate the information contained of the data at each individual frequency. The study shows that the non-central frequencies data can provide additional information in the damage image reconstruction. Overall, the results of this study provide insights into the influences of the data at different frequencies, which is essential to advance the developments of the LWDT.
      PubDate: 2017-11-15
      DOI: 10.1007/s13349-017-0258-z
       
  • Seismic performance assessment of isolated bridges for different limit
           states
    • Authors: P. Castaldo; R. Lo Priore
      Abstract: This study aims to evaluate the seismic performances of bridges isolated by the friction pendulum system (FPS) bearings considering the seismic hazard of Sant’Angelo dei Lombardi site (Italy), to provide useful and preliminary recommendations in terms of health assessment for design or retrofit of new or existing bridges, respectively. Single- and two-degree-of-freedom models are considered to describe the isolated bridge behavior taking into account an infinitely rigid deck and the isolated bridge behavior having an infinitely rigid deck with the elastic pier, respectively. In both models, a velocity-dependent rule for the FPS isolators is assumed. Seismic excitations are properly modeled as non-stationary stochastic processes having different intensities corresponding to different limit states and with frequency contents related to the medium soil condition, representative of the soil type in Sant’Angelo dei Lombardi site (Italy). The statistics of deck and pier responses of the isolated bridge are evaluated for different system parameters such as mass ratio, isolation period, pier period and friction coefficient of the FPS considering both Life Safety and Collapse Prevention limit states according to Italian seismic codes. The results, deriving mainly from the two-degree-of-freedom (2dof) model analyses, show that particular values of the friction coefficient allow to minimize the response of the pier depending on the different system properties and the different limit states. In particular, the optimum friction coefficient of the FPS ranges from 0.01 to 0.04 and from 0.01 to 0.05 for Life Safety and for Collapse Prevention limit state, respectively, depending on the structural properties.
      PubDate: 2017-11-06
      DOI: 10.1007/s13349-017-0255-2
       
  • A numerical–experimental study for structural damage detection in CFRP
           plates using remote vibration measurements
    • Authors: Guilherme Ferreira Gomes; Yohan Alí Diaz Mendéz; Sebastião Simões da Cunha; Antônio Carlos Ancelotti
      Abstract: The performance and behavior of composite structures can be significantly affected by degradation and damage. Degradation can be caused by exposure to environmental conditions and damage can be caused by handling conditions, such as impact and loading. Such damages are not always visible on the surface and could potentially lead to catastrophic structural failures. This paper addresses the specific challenge of using numerical simulations to assess damage detection techniques applied to composite laminated plates. This study aims to solve the direct and inverse problem of damage detection by combining numerical and experimental data. Finite element analysis was carried out to analyze the direct problem of mechanical response. Heuristic optimization techniques were used to solve the direct and inverse problem by combining data from a model with that of the experiment to identify structural damage. This study also sought to update the finite element model by minimizing the objective function. The structure studied was constituted of a composite plate. Two damage models were used: (i) circular hole and (ii) delamination (local stiffness reduction). The results of the optimization algorithms show good efficacy in the detection of structural damage, identifying the damaged location on the structure and also quantifying the size of the damage in real composite structures. A method has been proposed to identify the damage in CFRP plates using remote vibration measurements. Furthermore, the numerical simulation and experimental tests have been used to verify the method.
      PubDate: 2017-11-06
      DOI: 10.1007/s13349-017-0254-3
       
  • Monitoring-based analysis of the static and dynamic characteristic of wind
           actions for long-span cable-stayed bridge
    • Authors: Dong-Hui Yang; Ting-Hua Yi; Hong-Nan Li; Yu-Feng Zhang
      Abstract: Wind action is one of the environmental actions which has substantial static and dynamic effects on the long-span bridges. The main objective of the paper is to reveal the static and dynamic characteristics of the regular wind and typhoon condition. A monitoring-based investigation has been carried out to analyze the characteristics of the wind actions. The static characteristics of regular wind and typhoon condition are investigated by analyzing the average wind speed. Moreover, the dynamic characteristics of the two conditions of wind actions are studied by analyzing the parameters of turbulence intensity and gust factors. The correlation analysis is performed between the lateral wind speed and the lateral girder displacement to reveal the static effects of the wind actions on the bridge structures. It is concluded that static and dynamic characteristics of regular wind and typhoon conditions are quite different, and the dynamic effects of wind actions obtained based on monitoring data need to be further studied.
      PubDate: 2017-11-04
      DOI: 10.1007/s13349-017-0257-0
       
  • Quantifying live bending moments in rail using train-mounted vertical
           track deflection measurements and track modulus estimations
    • Authors: Saeideh Fallah Nafari; Mustafa Gül; J. J. Roger Cheng
      Abstract: This paper presents a new methodology to quantify the vertical bending moments that generate in rail under the passage of train wheels. In this method, the rail-bending moments are quantified from track modulus estimated using train-mounted vertical track deflection (VTD) measurements. This provides a practical approach for quantifying the rail-bending moments along large railway networks. The method requires the mathematical correlations between VTD, track modulus and rail-bending moments. Hence, a detailed finite element model was developed to investigate and quantify the mathematical correlations between these parameters. Various track modulus distributions were simulated and the resultant VTD and rail-bending moments were calculated. The mathematical correlation between inputted track modulus, and modelled VTD and rail-bending moments were then quantified using statistical approaches. From the results, track modulus average and standard deviation can be estimated over track windows using the VTD measurements. These estimations can be then employed to quantify the average and peak for the envelope of the maximum vertical bending moment in rail over the same track window. The accuracy of the method was verified using a numerical case study for which a random track modulus distribution was considered and artificial noise was added to the modelled VTD.
      PubDate: 2017-10-19
      DOI: 10.1007/s13349-017-0248-1
       
  • Experimental vibration analyses of a historic tower structure
    • Authors: Giovanni Bongiovanni; Giacomo Buffarini; Paolo Clemente; Dario Rinaldis; Fernando Saitta
      Abstract: Tower structures were often built by Romans to celebrate military victories, especially in honor of army leaders. They played an important role in the reconstruction of some historical periods, but also in the study of the historical seismicity. These considerations, in conjunction with their cultural value, justify the interest in such structures, which are still objects of several studies. In this paper, the experimental dynamic analyses of the column erected in honour of Emperor Trajan, which is one of the most interesting tower structure in Rome, are shown. The experimental results obtained recently are compared with those of a previous experimental campaign. The study is the base for a numerical modelling of the tower and successive structural analysis in the framework of a preservation effort.
      PubDate: 2017-10-16
      DOI: 10.1007/s13349-017-0245-4
       
  • Study on dynamic characteristics and seismic response of the extradosed
           cable-stayed bridge with single pylon and single cable plane
    • Authors: Qu Hao; Su Jufeng; Huang Pingming
      Abstract: Taking Sifang Bridge in Suijiang County, Yunnan Province as a research object, this paper established a three-dimensional finite-element model of the entire bridge. In the semi-floating structure system, the dynamic characteristics were calculated according to the pile–soil interaction, and the influence of pile–soil interaction on the dynamic characteristics of the structure was analyzed. Based on this, the seismic dynamic time history analysis method was used by considering the cable sag, nonlinearity of the support, rigidity of the structure, boundary condition setting, and the pile–soil interaction. Then, we analyzed the seismic performance of the structure and its responses by providing the seismic wave at different levels. The results showed that the structure can be softened by the pile–soil interaction. The dynamic characteristics of the structure in each direction could be accurately reflected by considering the pile–soil interaction. Due to the weak lateral stiffness of the main pylon, the other structural measures should be added in the design. The support between the pylon and girder was the most unfavorable part in the along bridge segment, while the bottom of the pylon was the most unfavorable part in the across bridge segment. Under the earthquake magnitude E1, the bridge sustained the damage and the structure was in the elastic working range. Under the earthquake magnitude E2, some local repairable damage has been detected in some segment of the bridge. The results of this study can be used as a potential reference for practical engineering problems as well as can provide the parameter basis for the subsequent seismic design of the bridge. At the same time, this study has also provided a theoretical reference and an effective method for the seismic analysis of cable-stayed bridge with single pylon and single cable plane of the same kind.
      PubDate: 2017-10-12
      DOI: 10.1007/s13349-017-0243-6
       
 
 
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