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  Subjects -> ENGINEERING (Total: 2268 journals)
    - CHEMICAL ENGINEERING (190 journals)
    - CIVIL ENGINEERING (183 journals)
    - ELECTRICAL ENGINEERING (103 journals)
    - ENGINEERING (1201 journals)
    - ENGINEERING MECHANICS AND MATERIALS (380 journals)
    - HYDRAULIC ENGINEERING (55 journals)
    - INDUSTRIAL ENGINEERING (67 journals)
    - MECHANICAL ENGINEERING (89 journals)

CIVIL ENGINEERING (183 journals)                     

Showing 1 - 183 of 183 Journals sorted alphabetically
ACI Structural Journal     Full-text available via subscription   (Followers: 17)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 2)
Acta Structilia : Journal for the Physical and Development Sciences     Open Access   (Followers: 2)
Advances in Civil Engineering     Open Access   (Followers: 35)
Advances in Structural Engineering     Full-text available via subscription   (Followers: 28)
Ambiente Construído     Open Access   (Followers: 1)
American Journal of Civil Engineering and Architecture     Open Access   (Followers: 30)
Architectural Engineering     Open Access   (Followers: 4)
Archives of Civil and Mechanical Engineering     Full-text available via subscription   (Followers: 1)
Archives of Civil Engineering     Open Access   (Followers: 10)
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: 10)
BER : Building Contractors' Survey     Full-text available via subscription   (Followers: 4)
BER : Building Sub-Contractors' Survey     Full-text available via subscription   (Followers: 3)
BER : Survey of Business Conditions in Building and Construction : An Executive Summary     Full-text available via subscription   (Followers: 4)
Bioinspired Materials     Open Access   (Followers: 5)
Bridge Structures : Assessment, Design and Construction     Hybrid Journal   (Followers: 15)
Building and Environment     Hybrid Journal   (Followers: 15)
Building Women     Full-text available via subscription  
Built Environment Project and Asset Management     Hybrid Journal   (Followers: 15)
Bulletin of Pridniprovsk State Academy of Civil Engineering and Architecture     Open Access   (Followers: 6)
Canadian Journal of Civil Engineering     Hybrid Journal   (Followers: 12)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 8)
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: 17)
Challenge Journal of Concrete Research Letters     Open Access   (Followers: 2)
Challenge Journal of Structural Mechanics     Open Access   (Followers: 5)
Change Over Time     Full-text available via subscription   (Followers: 2)
Civil and Environmental Engineering     Open Access   (Followers: 7)
Civil And Environmental Engineering Reports     Open Access   (Followers: 5)
Civil and Environmental Research     Open Access   (Followers: 19)
Civil Engineering = Siviele Ingenieurswese     Full-text available via subscription   (Followers: 4)
Civil Engineering and Architecture     Open Access   (Followers: 17)
Civil Engineering and Environmental Systems     Hybrid Journal   (Followers: 3)
Civil Engineering and Technology     Open Access   (Followers: 10)
Civil Engineering Dimension     Open Access   (Followers: 8)
Cohesion and Structure     Full-text available via subscription   (Followers: 2)
Composite Structures     Hybrid Journal   (Followers: 266)
Computer-aided Civil and Infrastructure Engineering     Hybrid Journal   (Followers: 11)
Computers & Structures     Hybrid Journal   (Followers: 36)
Concrete Research Letters     Open Access   (Followers: 6)
Construction Economics and Building     Open Access   (Followers: 2)
Construction Engineering     Open Access   (Followers: 9)
Construction Management and Economics     Hybrid Journal   (Followers: 22)
Construction Science     Open Access   (Followers: 4)
Constructive Approximation     Hybrid Journal  
Curved and Layered Structures     Open Access   (Followers: 2)
DFI Journal : The Journal of the Deep Foundations Institute     Hybrid Journal   (Followers: 1)
Earthquake Engineering and Structural Dynamics     Hybrid Journal   (Followers: 16)
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: 14)
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: 16)
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: 4)
Geosystem Engineering     Hybrid Journal   (Followers: 1)
Geotechnik     Hybrid Journal   (Followers: 3)
Géotechnique Letters     Hybrid Journal   (Followers: 6)
HBRC Journal     Open Access   (Followers: 2)
Hormigón y Acero     Full-text available via subscription  
HVAC&R Research     Hybrid Journal  
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: 22)
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: 16)
International Journal of Civil, Mechanical and Energy Science     Open Access   (Followers: 1)
International Journal of Concrete Structures and Materials     Open Access   (Followers: 14)
International Journal of Condition Monitoring     Full-text available via subscription   (Followers: 2)
International Journal of Construction Engineering and Management     Open Access   (Followers: 9)
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: 5)
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: 10)
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: 4)
International Journal of Sustainable Construction Engineering and Technology     Open Access   (Followers: 8)
International Journal on Pavement Engineering & Asphalt Technology     Open Access   (Followers: 6)
International Journal Sustainable Construction & Design     Open Access  
Journal of Bridge Engineering     Full-text available via subscription   (Followers: 15)
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: 6)
Journal of Civil Engineering and Construction Technology     Open Access   (Followers: 12)
Journal of Civil Engineering and Management     Hybrid Journal   (Followers: 7)
Journal of Civil Engineering and Science     Open Access   (Followers: 7)
Journal of Civil Engineering Research     Open Access   (Followers: 6)
Journal of Civil Society     Hybrid Journal   (Followers: 4)
Journal of Civil Structural Health Monitoring     Hybrid Journal   (Followers: 4)
Journal of Composites for Construction     Full-text available via subscription   (Followers: 13)
Journal of Computing in Civil Engineering     Full-text available via subscription   (Followers: 24)
Journal of Construction Engineering     Open Access   (Followers: 7)
Journal of Construction Engineering and Management     Full-text available via subscription   (Followers: 19)
Journal of Constructional Steel Research     Hybrid Journal   (Followers: 8)
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: 11)
Journal of Highway and Transportation Research and Development (English Edition)     Full-text available via subscription   (Followers: 13)
Journal of Infrastructure Systems     Full-text available via subscription   (Followers: 21)
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: 10)
Journal of Nondestructive Evaluation     Hybrid Journal   (Followers: 11)
Journal of Performance of Constructed Facilities     Full-text available via subscription   (Followers: 4)
Journal of Pipeline Systems Engineering and Practice     Full-text available via subscription   (Followers: 7)
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: 40)
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: 4)
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  
Mathematical Modelling in Civil Engineering     Open Access   (Followers: 3)
Nondestructive Testing And Evaluation     Hybrid Journal   (Followers: 17)
Obras y Proyectos     Open Access   (Followers: 1)
Open Journal of Civil Engineering     Open Access   (Followers: 7)
Photonics and Nanostructures - Fundamentals and Applications     Hybrid Journal   (Followers: 2)
Practice Periodical on Structural Design and Construction     Full-text available via subscription   (Followers: 4)
Proceedings of the Institution of Civil Engineers - Bridge Engineering     Hybrid Journal   (Followers: 7)
Proceedings of the Institution of Civil Engineers - Civil Engineering     Hybrid Journal   (Followers: 11)
Proceedings of the Institution of Civil Engineers - Management, Procurement and Law     Hybrid Journal   (Followers: 8)
Proceedings of the Institution of Civil Engineers - Municipal Engineer     Hybrid Journal   (Followers: 3)
Proceedings of the Institution of Civil Engineers - Structures and Buildings     Hybrid Journal   (Followers: 4)
Random Structures and Algorithms     Hybrid Journal   (Followers: 5)
Research in Nondestructive Evaluation     Hybrid Journal   (Followers: 7)
Revista IBRACON de Estruturas e Materiais     Open Access   (Followers: 1)
Road Materials and Pavement Design     Hybrid Journal   (Followers: 10)
Russian Journal of Nondestructive Testing     Hybrid Journal   (Followers: 6)
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: 4)
Steel Construction - Design and Research     Hybrid Journal   (Followers: 3)
Structural and Multidisciplinary Optimization     Hybrid Journal   (Followers: 9)
Structural Concrete     Hybrid Journal   (Followers: 11)
Structural Control and Health Monitoring     Hybrid Journal   (Followers: 9)
Structural Engineering International     Full-text available via subscription   (Followers: 11)
Structural Safety     Hybrid Journal   (Followers: 7)
Structural Survey     Hybrid Journal  
Structure     Full-text available via subscription   (Followers: 23)
Structure and Infrastructure Engineering: Maintenance, Management, Life-Cycle Design and Performance     Hybrid Journal   (Followers: 13)
Structures     Hybrid Journal   (Followers: 1)
Study of Civil Engineering and Architecture     Open Access   (Followers: 8)
Superlattices and Microstructures     Hybrid Journal   (Followers: 2)
Surface Innovations     Hybrid Journal  
Technical Report Civil and Architectural Engineering     Open Access  
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: 6)
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 KSCE Journal of Civil Engineering
  [SJR: 0.355]   [H-I: 15]   [2 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1226-7988 - ISSN (Online) 1976-3808
   Published by Springer-Verlag Homepage  [2352 journals]
  • An experimental study on water surface profiles of high Froude number
           flows
    • Authors: Jae Hyeon Park; Yong Sung Park; Young Do Kim; Dong Seok Chae
      Abstract: Motivated by need to study supercritical overbank flows on floodplain, we experimentally investigate if initially supercritical flow in a rectangular flume would maintain its state throughout. Varying upstream gate opening, flow rate and angle of the slope, a total of 37 experimental cases were carried out. The experimental results are compared to two existing theories: an inviscid theory based on nonlinear shallow water equations and jump conditions and a hydraulic theory that takes friction into account. The experimental data are consistent with the two theories. Flows on downward slope were stable, while those on upward slope had unstable hydraulic jump and transformed into subcritical flow. The reported results should serve well in designing a laboratory flume with the supercritical inflow and in conducting hydraulic model experiments on overbank flows.
      PubDate: 2017-11-22
      DOI: 10.1007/s12205-017-0703-x
       
  • Broken-line markings preferred under high-speed conditions for visibility
    • Authors: Heung-Un Oh; Sungho Mun
      Abstract: Broken-line markings on the freeway have been installed for delineation and lane division, which together are expected to potentially reduce the number of traffic crashes. Although these functions are clearly dependent on visibility, the practical application of broken lines differs greatly worldwide in terms of the ratio of the line segment to the gap length or the width of the markings. On Korean freeways, existing broken-line markings consist of 8-m line segments and a 12-m gap with a width of 15 cm, although the reasoning for these dimensions is not known. The present study began with the field installation of diverse broken-line marking alternatives under the regulated ratio of the line segment to the gap segment—that is, 1:2 in Korea. Using the installed markings, a visibility experiment with subjects riding in a vehicle moving at a speed of 100 km/h was performed. From this study, it can be concluded that the existing broken-line markings on Korean freeways are not ideal in terms of visibility and that broken-line markings with 6-m line segments and a 12-m gap with a width of 13 cm is preferred in terms of visibility. This alternative was recommended to later become the new nationwide standard for Korean freeways.
      PubDate: 2017-11-22
      DOI: 10.1007/s12205-017-0644-4
       
  • Nanomechanical and surface morphological properties of hydrated cement
           paste containing volcanic ash and micro- or nano- silica
    • Authors: S. Al-Bahar; J. Chakkamalayath; A. Joseph; S. Al-Otaibi; M. Abdulsalam
      Abstract: The current trend in concrete science and technology is to characterize the cementitious materials in multiscales so that the optimal performance of concrete can be achieved with the minimal use of cement as well as sustainable materials. It has been realized that the new properties of many materials are discovered when examined at nanoscale. Nanoindentation test has been adopted as a technique to examine the nanomechanical properties of cementitious materials leading to an improvement of their macro-mechanical performance in terms of strength development, tailoring of desired properties, and durability. The evidence of an experimental investigation to evaluate the influence of micro- and nanocement additives on the nanomechanical properties and the surface morphology of the hydrated cement paste is presented in this paper. The effect of additives on the compressive strength of binary and ternary blended cement paste was also examined. It could be concluded from these studies that the effect of the additives on the properties of cement paste matrix at macroscale, microscale, and nanoscale can be correlated, and mixes can be designed for the optimal performance by multiscale investigation.
      PubDate: 2017-11-22
      DOI: 10.1007/s12205-017-1737-9
       
  • Comparison between pedestrian and vehicle occupant fatality rate when
           reducing endogeneity
    • Authors: Seongkyun Cho
      Abstract: This research investigated whether a pedestrian fatality rate of a country responds differently to that of the vehicle occupant with respect to infrastructure, demography, and transportation factors. Road density, population density, Vehicle Travelled Kilometer (VKT) per vehicle and urban speed limit were chosen as infrastructure, demography, and transport factor respectively. This comparison is uniquely meaningful in that it was performed when the endogeneity of Vehicle Kilometer Travelled (VKT) per vehicle is reduced significantly. This research used macro panel data of the countries, members of the OECD International Transport Forum, from 1965 to 2014, and Two Stage Least Squares equations (2SLS) instrumenting VKT per vehicle with representative socioeconomic variables. The socio-economic variables included GDP, GDP per capita, employment rate, vehicle per capita, and price of unit fuel, which had been known to be correlated with VKT. The results showed clearly different patterns of the pedestrian fatality rate from those of the vehicle occupant with respect to the infrastructure, demography, and transportation factors. This result sheds light on that a policy customized for vehicle occupants might not be best appropriate for pedestrians considering a policy for a road user is usually an operational combination of those three factors, which are likely to respond to the two road users differently.
      PubDate: 2017-11-22
      DOI: 10.1007/s12205-017-0753-0
       
  • Digital image-based identification method for the determination of the
           particle size distribution of dam granular material
    • Authors: Shi-lin Zhang; Gao-jian Wu; Xing-guo Yang; Wan-hong Jiang; Jia-wen Zhou
      Abstract: The Particle Size Distribution (PSD) properties of dam granular material plays an important role in the construction process of earth-rock dams, as it can affect the filling quality and structural safety. However, the conventional sieving method employed to check the PSD is labor-intensive, time-consuming and not highly accurate. In this study, a digital image-based identification method is presented for the determination of the PSD of dam granular material, which mainly incorporates image acquisition technology, a large database and a neural network. Digital Image Processing (DIP) technology is used to recognize the geometric size and grading curve of dam granular materials at a small scale, while statistical distribution models are used to determine the characteristic parameters of the grading curve and convert the graphical curve into mathematical variables. Furthermore, a large database and a BP neutral algorithm, which is improved using a genetic algorithm, are introduced as tools to reveal the implicit relationship between the DIP and sieving grading curves to correct the error of identification. A case study for the Changheba Hydropower Station is used to illustrate the implementation details of the presented method. The identification results demonstrate that the presented method can acquire and assess the gradation in spite of a degree of error, which can be decreased when more advanced DIP technologies are explored, the amount of data in the database is increased, and a more optimized network algorithm is adopted.
      PubDate: 2017-11-22
      DOI: 10.1007/s12205-017-0304-8
       
  • Multi-objective optimization of TMD for frame structure based on response
           surface methodology and weighted desirability function
    • Authors: Mohammad Saiful Islam; Jeongyun Do; Dookie Kim
      Abstract: Multi-objective optimization approach has been applied to find an optimum Tuned Mass Damper (TMD) to attenuate the earthquake induced vibrations of a ten-stored frame structure. In the optimization process, the Response Surface Methodology (RSM) with the experimental design of central Composite Design (CCD) and weighted desirability function (WDF) have been utilized for getting an optimum TMD. The properties of TMD such as frequency ratio and damping ratio have been considered as design variables where the top floor root mean square displacement and frequency responses were considered as objective functions. The optimization has been executed under the El Centro earthquake loads. To evaluate the efficiency of RSM and WDF based optimum TMD, the structure has been analyzed with the Den Hartog’s, Sadek et al.’s and Warburton’s designed TMD respectively for the El Centro, California and Northridge earthquakes load. The evaluated results have been found more satisfactory with the RSM and WDF based optimum TMD than with the others TMD.
      PubDate: 2017-11-22
      DOI: 10.1007/s12205-017-0387-2
       
  • Investigation of hydration temperature of alkali activated slag based
           concrete
    • Authors: Kubilay Akçaözoğlu; Semiha Akçaözoğlu; Abdullah Açıkgöz
      Abstract: This paper presents the results of an investigation on the effect of activator type, binder amount and sodium dosage on hydration heats of Alkali-Activated Slag (AAS) concrete. For the slag activation, sodium hydroxide (NaOH) pellets and the mixture of NaOH+liquid sodium silicate (Na2SiO3) were used at three sodium concentrations, 4%, 6% and 8% by mass of slag. Twenty one different mixtures were prepared for the laboratory tests. In the reference three mixtures, OPC was used as binder and in the other AAS mixtures Granulated Blast Furnace Slag (GBFS) was used. The binder dosages were 300, 350 and 400 kg/m3 and the waterbinder (w/b) ratio used in the mixtures was 0.50. The compressive strength and hydration temperature of produced concretes were measured. The temperature change of specimens measured in every 15 minutes until 120 hours. The test results showed that, the compressive strengths and hydration temperatures of the mixtures increased depending on increasing binder amount and sodium dosage. The use of NaOH+Na2SiO3 mixture as activator increased compressive strength but decreased hydration temperature of the mixtures. The hydration temperatures of all AAS mixtures were lower than OPC mixtures. Produced AAS concrete with low hydration temperature can be an alternative in recycled construction material at mass concrete applications.
      PubDate: 2017-11-22
      DOI: 10.1007/s12205-017-0219-4
       
  • A study on method of vertical zoning of construction lift for high-rise
           building based on lift planning & operation history database
    • Authors: Joonghwan Shin; Soonwook Kwon; Daeyoon Moon; Suwan Chung; Kyuhyup Lee
      Abstract: As the height and size of urban buildings constructed in cities in Korea have recently increased, vertical lift planning and operation is a key factor for the successful project of a tall building. Although many studies have attempted to set up a lift planning system at an early stage, a real-time lift operation control system with respect to the construction stage has yet to be proposed. Therefore, in this study, the sensor module and storage device named the Embedded Lift Information System (ELIS) was used to collect the lift operating data for improvement of lift operation efficiency in order to develop an optimum lift operating analysis system which could perform real-time analysis. Finally, the pattern of operation data of the lift was analyzed and the lift event of the next day was derived. In addition, we verified the efficiency of the proposed optimum vertical zoning simulation system using the expected lift event extracted from the operation history data pattern. In this paper, the proposed system provides more efficient vertical zoning alternatives for the lift manager. This simulation based decision making tool reduces the user's queuing time compared with the previous system. This system is expected to contribute to high-rise building construction of over 400 m.
      PubDate: 2017-11-15
      DOI: 10.1007/s12205-017-1374-3
       
  • Research on the influence factors of thermal cracking in mass concrete by
           model experiments
    • Authors: Xianzheng Yu; Jianyun Chen; Qiang Xu; Zhi Zhou
      Abstract: Thermal cracking has significant impact on the safety and durability of mass concrete. This paper aims to find the reason for cracking of a prototype bridge structure and consider which influencing factors are the most important. For this model experiments on mass concrete in bridge structures were designed and conducted and thermally cracking was induced. Fiber bragg grating sensors were used to monitor the temperature and strain within concrete in real time, as well as the strain around the embedded cooling pipes. Thermal properties of concrete were deduced from these monitoring data and then used in the numerical analyses to verity the calculation accuracy. In the context of engineering practice, the primary influencing factors on the cracking of mass concrete were investigated by numerical analyses. The optimized temperature control methods were proposed to prevent the occurrence of thermal cracking of mass concrete.
      PubDate: 2017-11-15
      DOI: 10.1007/s12205-017-2711-2
       
  • Retrofitting notch damaged box steel beams with composite materials
    • Authors: Boshra El-Taly
      Abstract: An experimental program was designed to investigate the structural behavior of retrofitted notch damaged box steel beams using Fiber - Reinforced Polymer (FRP) under flexure up to failure. The experimental program included twelve box steel specimens; one intact specimen, one notched specimen and ten notches damaged specimen and repaired with FRP sheets. All the tested beams have 1000 mm length. The notches specimens were notched at the tension flanges at 400 mm distance from the beam edge to simulate a localized and non-uniformly distributed deterioration along the beam length. The beams were repaired by bonding the FRP to the tension flange only, and the sheets were wrapped to cover a part of the two webs for the two beam halves or for the half of the beam that includes the notch with different heights. All the tested beams were simulated using a Finite Element (FE) program, and the FE model gives good results in comparison with the test results. The presented results indicate that wrapping CFRP sheet around the two webs for the half of the beam that includes the notch only gives an acceptable structural performance in comparing with wrapping CFRP sheet around the two webs for two halves of the beam and in this beam, the difference in the deflections of the two halves of the beam at the ultimate load does not increase than 3.2%.
      PubDate: 2017-11-15
      DOI: 10.1007/s12205-017-0293-7
       
  • A comparative study of eighteen self-adaptive metaheuristic algorithms for
           truss sizing optimisation
    • Authors: Nantiwat Pholdee; Sujin Bureerat
      Abstract: Performance comparison of meta-heuristics (MHs) is conducted for truss sizing design. Six traditional truss sizing design problems with mass objective function subject to displacement and stress constraints were employed for performance test. The test problems have two types with and without including buckling constraints. Eighteen self-adaptive MHs from literature are employed to tackle the truss sizing problems. The results from implementing the self-adaptive MHs are compared in terms of convergence rate and consistency. It is found that for the test problem without buckling constraints, the top two optimisers according to the statistical Wilcoxon rank sum tests are Success-History Based Adaptive Differential Evolution with Linear Population Size Reduction (L-SHADE) and Success-History Based Adaptive Differential Evolution (SHADE) while the top two optimiser for the test problems with buckling constraints is L-SHADE and L-SHADE with Eigenvector-Based Crossover and Successful-Parent-Selecting Framework (SPS-L-SHADE-EIG). The buckling constraints are significantly important and should be included to truss design subjected to static loads.
      PubDate: 2017-11-15
      DOI: 10.1007/s12205-017-0095-y
       
  • Dewatering of a 32.55 m deep foundation pit in MAMA under leakage risk
           conditions
    • Authors: Jianxiu Wang; Xiaotian Liu; Jiaxing Liu; Linbo Wu; Qingfeng Guo; Qian Yang
      Abstract: A 2,250 mm whirlpool foundation pit is located in Donghai Island, Zhanjiang City, Guangdong Province, China. The layers of the island are composed of multi-aquifers and multi-aquitards (MAMA). The aquifers are intersected by partial aquitard lenses. A large confined aquifer is frequently interbedded and separated into several sub-confined aquifers by partial aquitards. In the 2,250 mm foundation pit, the water level of two confined aquifers was reduced to satisfy excavation requirements and prevent water inrush. Construction of the 32.55 m deep foundation pit encountered MAMA and potential defects of the diaphragm wall. The pumping wells in the second confined aquifer were used to reduce the water level to ensure the safety of bottom excavation. The pumping wells in the first confined aquifer were used to reduce the water level under emergency conditions to prevent potential water inrush and piping from the defects of the diaphragm wall. Field pumping tests and numerical simulations were performed to determine the risk of leakage and verify the capability of the pumping wells to reduce the water level. Quicksand occurred during shallow excavation because of leakage although the confined aquifer had been cut off and pumped for a long time. Three pumping wells were installed to reduce the water level. When the foundation pit was excavated to a depth of 24 m, water inrush occurred at the middle of the pit bottom although the water level of the dewatered aquifer had been reduced to below the excavation face. A 90 m deep borehole was found where the underlying confined aquifer below the first aquifer induced the water inrush. Although the upper water level was reduced, the high water level in the deep part still induced water inrush. The pumping wells in the second aquifer were all opened, and the water level of the underlying confined aquifer was reduced. After the water level was reduced to below the pit bottom, the borehole was filled, and the water inrush stopped. However, water inrush occurred on the cracks of the diaphragm wall as predicted. The pre-installed pumping wells were opened to control the water inrush. The deepest foundation pit on the island was constructed successfully after dealing with the water inrush and leakages.
      PubDate: 2017-11-15
      DOI: 10.1007/s12205-017-1950-6
       
  • Comparative experimental and analytical modeling of impact energy
           dissipation of ultra-high performance fibre reinforced concrete
    • Authors: G. Murali; J. Venkatesh; N. Lokesh; Teja Reddy Nava; K. Karthikeyan
      Abstract: This study examines the impact energy dissipation capacity of Ultra High Performance Fibre Reinforced Concrete (UHPFRC). For this purpose, nine different mixes were fabricated with hooked end and crimped steel fibres at a dosage of 0.5, 1.0, 1.5 and 2.0 percentage and tested under pendulum impact test. The impact energy dissipation capacity is assessed based on test (Charpy U-notch) procedure suggested by ASTM E23. Also, an analytical model was adopted to predict the impact energy dissipation value of UHPFRC and its performance is verified against experimental results. Based on the test results, the impact energy dissipation capacity of the mixtures containing crimped and hooked end steel fibres were significantly higher than that of Plain Concrete (PC). The hooked end steel fibres had an increased impact energy dissipation capacity compared to crimped steel fibres, which implies that hooked end steel fibre is more appropriate for enhancing the impact energy dissipation of UHPFRC. Also, the modelling data compared well with experimental data for the fibre volume fraction beyond 0.5%.
      PubDate: 2017-11-15
      DOI: 10.1007/s12205-017-1678-3
       
  • Deformation characteristics and countermeasures of shallow and large-span
           tunnel under-crossing the existing highway in soft soil: a case study
    • Authors: Chengyong Cao; Chenghua Shi; Mingfeng Lei; Limin Peng; Ruxue Bai
      Abstract: Hongmian Road goes under Jihe highway by the way of tunnel in Shenzhen City, Guangdong Province, China. The tunnel has some special characteristics such as shallow depth, large span, soft soil, busy traffic, and long distance under-crossing the operating highway, thus there is great difficulty and risk during its construction. A series of in-situ tests were conducted to reveal deformation characteristics during tunneling beneath the existing highway by the double-side-drift method (DSDM). The results show that initial construction method and measures can't meet the safety requirement of tunnel construction, and the level of risk is extremely high, so the construction method need to be timely adjusted. By comprehensive analysis, the double-side-drift optimum method (DSDOM) is put forward, on the basis of which a series of optimum measures also have been put forward, such as reasonable construction methods, the suitable length of bench and excavation, soil reinforcement measures on tunnel face, optimizing construction process, closing primary support in time and speeding up the construction of secondary lining. Then the feasibility of this optimized construction method and measures are verified by the numerical simulations. Finally, from feedbacks of monitoring results, the optimum method and measures have been proved to be reasonable and feasible, and they can guarantee a successful pass beneath the operating highway.
      PubDate: 2017-11-15
      DOI: 10.1007/s12205-017-1586-6
       
  • Structural lightweight concrete containing recycled lightweight concrete
           aggregate
    • Authors: Athika Wongkvanklom; Patcharapol Posi; Banlang Khotsopha; Chetsada Ketmala; Natdanai Pluemsud; Surasit Lertnimoolchai; Prinya Chindaprasirt
      Abstract: In this paper, Structural Lightweight Concrete (SLC) containing Recycled Lightweight Aggregate (RLA) is described. Damaged lightweight concrete was used as RLA by crushing it into fine particles, and used to replace fine limestone aggregate of up to 45% by weight. To enhance the strength development of SLC, silica fume and a superplasticizer were incorporated into the mixture. The compressive strength, density, water absorption, porosity, modulus of elasticity, and thermal conductivity of the concrete were tested. The results show that SLC with satisfactory 28-day compressive strengths of between 16.5 and 30.5 MPa, and densities of between 1600 and 1800 kg/m3, were obtained. The compressive strength, modulus of elasticity, and thermal conductivity decreased with an increase in RLA content, and the water absorption and porosity increased. Water absorption of 3.28–7.87%, porosity of 6.82–13.87%, modulus of elasticity of 16.5–25.2 GPa, and thermal conductivity of 0.49–0.75 W/mK were found to be within the working range of SLC.
      PubDate: 2017-11-15
      DOI: 10.1007/s12205-017-0612-z
       
  • Experimental study on shear behavior of the interface between new and old
           concrete with reinforced
    • Authors: Cheng Maili; Ma Jing
      Abstract: In order to investigate the shear behavior of the new and old concrete interface, three kinds of reinforced concrete models with new-old concrete anchorage reinforcement were designed and fabricated. The semi-cyclic loading test was carried out. The failure mode, shear bearing capacity, interfacial shear slip and stress distribution of steel bars were analyzed. The test results show that the failure mode of the old and new concrete reinforcement at the interface was split type shear failure. The shear bearing capacity of reinforced concrete is mainly related to the shear resistance of concrete and the dowel pin shear, and the maximum value is about 1.186 × 104 kN/m2. The shear bearing capacity of stirrups reinforced concrete is increased by 28.5%. According to the obvious interface slip, the working state of the interface between rebar bolt and concrete can be divided into the stage of interface bonding and the stage of the friction. The lower part of the tendons is mainly cut and its upper part is shear-based. The largest stress is obtained at the interface and it decreases gradually to both ends. By analyzing the test results and relevant research, the formulas for calculating the shear capacity of the new and old concrete interface are derived. The results show that the formula of shear capacity is correct and feasible.
      PubDate: 2017-11-11
      DOI: 10.1007/s12205-017-2007-6
       
  • Fire resistances of restrained steel beams subjected to fire loads
    • Authors: Zhen Guo; Rui Gao; Xuecheng Zhang; Xingzhi Jia
      Abstract: Conventional fire loads and fire resistances of a steel beam still lack an adequate correlation. This paper has established the relationship between the responses of restrained steel beams and fire actions by using a new definition of fire resistances and a new expression of fire loads. By using reduction factors of elastic modulus and yield strengths, has presented three critical equations to predict the limit state of a restrained steel beam in a fire. Based on these equations and the heat transfer formula, the paper provided a new definition of fire resistances. By using the heat release rate and effective rate coefficient of thermal absorption, a new expression of fire loads has been argued. Compared with tests, the proposed approach in this paper is in good agreement with the measured values in tests. The results show that the new fire resistances could be able to reflect the facts of heat transfers and duration time. In contrast to conventional fire loads, the new fire loads are more efficient to indicate a fire load.
      PubDate: 2017-11-06
      DOI: 10.1007/s12205-017-0403-6
       
  • Utilizing structural equation modeling and segmentation analysis in
           real-time crash risk assessment on freeways
    • Authors: Chengcheng Xu; Dawei Li; Zhibin Li; Wei Wang; Pan Liu
      Abstract: The study aimed to utilize Structural Equation Modeling (SEM) and K-means clustering for predicting real-time crash risks on freeways. The SEM was used to transform a number of correlated traffic variables into four independent latent traffic factors, and to establish the interrelationships among the traffic variables and crash risks. The segmentation analysis based on K-means clustering was then conducted to investigate the main traffic factors affecting crash risks in various traffic regimes. It was found that: (a) The measurement equations in SEM can effectively account for the correlations among traffic variables by transforming numerous correlated traffic variables into several latent traffic variables; (b) The SEM can both capture the direct and indirect effects of traffic flow variables on crash risks. This promotes a better understanding how traffic conditions affect crash risks; (c) The SEM produces more accurate estimates of crash risks than existing modeling technique. It can increase the crash prediction accuracy by an average of 7.6% compared with the commonly used logistic regression; and (d) Segmentation analysis results suggested that the traffic factors contributing to crash risks are various across different traffic regimes. The proactive crash prevention strategies for different traffic regimes were discussed based on the findings in the segmentation analysis.
      PubDate: 2017-11-06
      DOI: 10.1007/s12205-017-0629-3
       
  • Optimized growth curve for estimating performance measurement baseline
           depended on domestic construction facility type
    • Authors: Chang-Won Kim; Taehoon Kim; Wi Sung Yoo; Hunhee Cho; Kyung-In Kang
      Abstract: This study describes an optimized growth curve for quantitatively estimating performance measurement baseline according to domestic construction facility types. The proposed curves is derived using the progress information of the 19 listed construction companies through the electronic disclosure system provided by the Financial Supervisory. The procedures of this study consisted of the following steps; (1) performing a preliminary review on the outline of a data collection, classification of construction facilities, and growth curve and regression used to derive the proposed curves; (2) presenting data collection, refining and preprocessing procedures; (3) deriving and verifying of the optimized model for domestic construction facility types; and (4) analyzing and discussing the results of considering the inherent characteristics of each facility type. Overall, the proposed curves were statistically significant, and found to be able to explain about 77% or more of the actual progress. The results of this study is expected to be used as an alternative to estimate the performance measurement baseline objectively in the context of domestic construction industry which is difficult to gather reliable data on various indicators to set baseline and calculate the standard progress by trial and error method.
      PubDate: 2017-11-06
      DOI: 10.1007/s12205-017-0180-2
       
  • Determination of maximum penetration depth of suction caissons in sand
    • Authors: Yuqi Wu; Dayong Li; Yukun Zhang; Fuquan Chen
      Abstract: The suction caisson is a large top-closed cylindrical steel structure in diameter, short in length and much thinner in skirt wall thickness. The total resistance of the suction caisson during installation consists of the tip resistance and the skirt wall friction. However, since the thickness of the skirt wall is very small, the skirt wall friction may produce additional vertical stress and shear stress in soil at the skirt tip level, and this additional vertical stress and shear stress will contribute to the increase in the skirt tip resistance. At the same time, seepage induced by suction also causes the tip resistance to reduce significantly. A modified slip-line field is proposed in this study estimating the tip resistance in terms of the slip-line theory. The expression obtaining the minimum suction to install the suction caisson is also proposed in terms of the force equilibrium. In addition, the critical suction is determined based on the mechanism of sand piping. Thus, the maximum penetration depth of the suction caisson can be reached when the critical suction equals the minimum suction. Results from calculations of the minimum suction and the maximum penetration depth have been proved to be in a good agreement with the measured data.
      PubDate: 2017-11-06
      DOI: 10.1007/s12205-017-1469-x
       
 
 
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