The Experts below are selected from a list of 279 Experts worldwide ranked by ideXlab platform
Yode Wang - One of the best experts on this subject based on the ideXlab platform.
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high strength concrete columns under Axial Compression Load hybrid confinement efficiency of high strength transverse reinforcement and steel fibers
Materials, 2016Co-Authors: Wisena Perceka, Wencheng Liao, Yode WangAbstract:Addition of steel fibers to high strength concrete (HSC) improves its post-peak behavior and energy absorbing capability, which can be described well in term of toughness. This paper attempts to obtain both analytically and experimentally the efficiency of steel fibers in HSC columns with hybrid confinement of transverse reinforcement and steel fibers. Toughness ratio (TR) to quantify the confinement efficiency of HSC columns with hybrid confinement is proposed through a regression analysis by involving sixty-nine TRs of HSC without steel fibers and twenty-seven TRs of HSC with hybrid of transverse reinforcement and steel fibers. The proposed TR equation was further verified by Compression tests of seventeen HSC columns conducted in this study, where twelve specimens were reinforced by high strength rebars in longitudinal and transverse directions. The results show that the efficiency of steel fibers in concrete depends on transverse reinforcement spacing, where the steel fibers are more effective if the spacing transverse reinforcement becomes larger in the range of 0.25–1 effective depth of the section column. Furthermore, the Axial Load–strain curves were developed by employing finite element software (OpenSees) for simulating the response of the structural system. Comparisons between numerical and experimental Axial Load–strain curves were carried out.
Adnan Alsibahy - One of the best experts on this subject based on the ideXlab platform.
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behaviour of masonry wallettes made from a new concrete formulation under Compression Loads at ambient temperatures testing and modelling
Construction and Building Materials, 2014Co-Authors: Adnan Alsibahy, Rodger EdwardsAbstract:Abstract This paper presents an experimental investigation and analytical simulation which aim to assess the behaviour of a new type of masonry wallette under conditions of an Axial Compression Load at ambient temperature. Two different masonry wallettes were produced using two types of lightweight concrete blocks, the first incorporating expanded clay and the second using by-product materials which consisted of recycled waste glass and metakaolin. Both vertical and lateral deformations were measured at different positions on the wallette specimens. The Load-bearing capacity was also determined. The measured results obtained were compared with analytically simulated results produced by the Abaqus/Standard finite element package. The experimental results showed that the maximum Axial Loads at failure were 474 kN and 558 kN for the reference and modified wallettes respectively implying corresponding bearing capacities of 7.1 MPa and 8.3 MPa. The critical path of the failure mode was similar for all of the wallettes tested and normally began underneath the Load point, then passed through the concrete blocks and head joint to reach the wallette toe. The most influential factors on the analytical model are the value of penalty stiffness and imperfect wallette construction. A close agreement between the measured and simulated results has been observed, suggesting that finite element analysis provides a reliable alternative to further laboratory measurements.
Rodger Edwards - One of the best experts on this subject based on the ideXlab platform.
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behaviour of masonry wallettes made from a new concrete formulation under Compression Loads at ambient temperatures testing and modelling
Construction and Building Materials, 2014Co-Authors: Adnan Alsibahy, Rodger EdwardsAbstract:Abstract This paper presents an experimental investigation and analytical simulation which aim to assess the behaviour of a new type of masonry wallette under conditions of an Axial Compression Load at ambient temperature. Two different masonry wallettes were produced using two types of lightweight concrete blocks, the first incorporating expanded clay and the second using by-product materials which consisted of recycled waste glass and metakaolin. Both vertical and lateral deformations were measured at different positions on the wallette specimens. The Load-bearing capacity was also determined. The measured results obtained were compared with analytically simulated results produced by the Abaqus/Standard finite element package. The experimental results showed that the maximum Axial Loads at failure were 474 kN and 558 kN for the reference and modified wallettes respectively implying corresponding bearing capacities of 7.1 MPa and 8.3 MPa. The critical path of the failure mode was similar for all of the wallettes tested and normally began underneath the Load point, then passed through the concrete blocks and head joint to reach the wallette toe. The most influential factors on the analytical model are the value of penalty stiffness and imperfect wallette construction. A close agreement between the measured and simulated results has been observed, suggesting that finite element analysis provides a reliable alternative to further laboratory measurements.
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Behaviour of masonry wallettes made from a new concrete formulation under combination of Axial Compression Load and heat exposure: Experimental approach
Engineering Structures, 2013Co-Authors: Adnan Al-sibahy, Rodger EdwardsAbstract:Abstract This study was undertaken to evaluate the thermo-mechanical behaviour of masonry wallettes constructed using blocks made from lightweight concretes of experimental compositions under an Axial Compression Load combined with heat exposure. A comprehensive experimental investigation was carried out on two different types of masonry wallettes at temperature levels ranging from 20 °C to 400 °C. The wallettes were produced using two types of lightweight concrete blocks, the first incorporating expanded clay and the second using by-product materials which consisted of recycled waste glass and metakaolin. The vertical deformation, Load-bearing capacity and failure modes were determined experimentally. Furthermore, the modulus of elasticity was determined for both types of wallette and their constituent concrete blocks and cement mortar. The results obtained showed that the percentage decrease in the strength of both lightweight concretes when exposed to various temperatures compared to that at ambient temperature reached almost 30%. In contrast, the cement mortar exhibited an increase in strength of approximately 20%. A significant reduction in the value of modulus of elasticity was observed for the constituents of wallette, whilst the entire masonry wallettes showed a minimal reduction for both types. Clear improvements in thermal behaviour were observed for both types of masonry wallettes. The masonry wallettes formulated using expanded clay lightweight concrete blocks exhibited failure due to explosive spalling at 400 °C with no mechanical Load, whereas the second type of masonry wallettes (the modified wallettes) did not show such behaviour.
Radhouane Masmoudi - One of the best experts on this subject based on the ideXlab platform.
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Experimental assessment and theoretical evaluation of Axial behavior of short and slender CFFT columns reinforced with steel and CFRP bars
Construction and Building Materials, 2018Co-Authors: Maha Hussein Abdallah, Hamdy M. Mohamed, Radhouane MasmoudiAbstract:Abstract This paper presents the test results of an experimental program to investigate the structural performance of short and slender concrete-filled fiber-reinforced polymer (FRP)-tubes (CFFTs) columns under pure Axial Compression Load. The test parameters include: transverse reinforcement type (steel spirals versus glass-FRP (GFRP-tube), type of longitudinal reinforcement (steel and carbon-FRP (CFRP) bars), GFRP tube thickness, and slenderness ratio. Comparisons between the experimental test results and the theoretical design equations are performed in terms of ultimate Load carrying capacity. The design equation is modified to accurately predict the ultimate Load capacities of CFFT columns reinforced with FRP bars. Furthermore, the experimental results showed that the Axial compressive strength of CFRP-reinforced CFFT columns was reduced by 22% with increasing the slenderness ratio from 8 to 20. In general, the use of the FRP tube induces a confinement effect for concrete columns which enhances the strength and ductility of such column’s section. This enhancement resulted in a slender section which increased the possibility of buckling instability of the CFFT columns. Thus, a theoretical model was conducted to develop a simplified formula for critical slenderness limit of FRP-reinforced CFFT columns to control the buckling instability mode of failure. Results indicated that the slenderness limit of 14 was suggested as a safe value for the design purposes. A parametric study was conducted which showed the significant effect of the concrete compressive strength and hoop stiffness of FRP tube on the critical slenderness ratio of FRP-reinforced CFFT columns.
Wisena Perceka - One of the best experts on this subject based on the ideXlab platform.
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high strength concrete columns under Axial Compression Load hybrid confinement efficiency of high strength transverse reinforcement and steel fibers
Materials, 2016Co-Authors: Wisena Perceka, Wencheng Liao, Yode WangAbstract:Addition of steel fibers to high strength concrete (HSC) improves its post-peak behavior and energy absorbing capability, which can be described well in term of toughness. This paper attempts to obtain both analytically and experimentally the efficiency of steel fibers in HSC columns with hybrid confinement of transverse reinforcement and steel fibers. Toughness ratio (TR) to quantify the confinement efficiency of HSC columns with hybrid confinement is proposed through a regression analysis by involving sixty-nine TRs of HSC without steel fibers and twenty-seven TRs of HSC with hybrid of transverse reinforcement and steel fibers. The proposed TR equation was further verified by Compression tests of seventeen HSC columns conducted in this study, where twelve specimens were reinforced by high strength rebars in longitudinal and transverse directions. The results show that the efficiency of steel fibers in concrete depends on transverse reinforcement spacing, where the steel fibers are more effective if the spacing transverse reinforcement becomes larger in the range of 0.25–1 effective depth of the section column. Furthermore, the Axial Load–strain curves were developed by employing finite element software (OpenSees) for simulating the response of the structural system. Comparisons between numerical and experimental Axial Load–strain curves were carried out.
