The Experts below are selected from a list of 4905 Experts worldwide ranked by ideXlab platform
Lin Xu-jian - One of the best experts on this subject based on the ideXlab platform.
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The strength and the deformation of circular concrete slab subjected to Punching Shear
Journal of Fuzhou University, 2004Co-Authors: Lin Xu-jianAbstract:Based on the tests, the strength and the deformation of reinforced concrete circular slab subjected to Punching Shear are investigated. The author points out that the deformation of slab before Punching Shear failure is caused by bending moment. The deformation not only reflects the flexure behavior of slab at every loading stage, but also affects the stress status on the surface of Punching Shear cone and affects the ultimate capacity of the slab. In this paper, the collapse mechanism considering bending deformation of Punching Shear slab is established. The author also points out that the final strength of Punching Shear slab includes the Punching capacity of failure cone and a part of flexure strength of the whole slab. At the same time, the deformations of Punching Shear slabs at three loading stages before failure are calculated. The comparison shows good agreement between the theoretical values and the testing curves.
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NEW COLLAPSE MECHANISM AND ULTIMATE Punching Shear STRENGTH OF REINFORCED CONCRETE SLABS
Engineering mechanics, 2003Co-Authors: Lin Xu-jianAbstract:Based on test results, a new collapse mechanism of Punching Shear failure of concrete slabs is established in this paper. The twin Shear strength theory is used in the plastic limit analysis to obtain the Punching Shear capacity from the failure cone. It is suggested that the ultimate Punching Shear strength of reinforced concrete slabs consist of the Punching resistance capacity of the failure cone and a part of flexure strength of the whole slab. The formulas are provided to calculate the strengths of ordinary-strength concrete slabs, high-strength concrete slabs, steel-fiber reinforced ordinary-strength concrete slabs and steel-fiber reinforced high-strength concrete slabs subjected to Punching Shear. Good agreement between the present theoretical values and available experimental results is achieved.
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New collapse mechanism of reinforced concrete slab subjected to Punching Shear
Journal of Fuzhou University, 2001Co-Authors: Lin Xu-jianAbstract:According to the test results of reinforced high-strength concrete slabs subjected to Punching Shear,a new collapse mechanism of Punching Shear slab is presented.
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Punching Shear Strength of Steel Fiber High-Strength Concrete Slabs
Journal of Fuzhou University, 1999Co-Authors: Lin Xu-jianAbstract:Based on the tests,the strength characteristics of steel fiber high-strength concrete slabs subjected to Punching Shear are investigated,and a formula for calculating the Punching Shear strength is presented in this paper.
E. Opheim - One of the best experts on this subject based on the ideXlab platform.
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Punching Shear of Reinforced Concrete Plates
DIANA Computational Mechanics ‘84, 1994Co-Authors: T. Dyngeland, K. V. Hoiseth, E. OpheimAbstract:This paper presents the results of a numerical simulation of Punching Shear of RC plates. Two RC plates were analysed by use of the FE-program DIANA and compared with experimental results. The RC plates were modelled by solid elements and an embedded formulation was used for the reinforcement. A non-associated Mohr-Columb plasticity based formulation was applied for concrete in compression and a smeared crack approach was applied for the tensile regime. The numerical results mapped the experimental findings fairly well, and the deviation for the ultimate capacity did not exceed 10%. The study suggests that FE-analyses can be used beneficially in design of Punching Shear of RC structures, although a more comprehensive study is required before general design procedures can be established.
Brahim Benmokrane - One of the best experts on this subject based on the ideXlab platform.
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Punching Shear Behavior of Two-Way Slabs Reinforced with FRP Shear Reinforcement
Journal of Composites for Construction, 2015Co-Authors: Mohamed Hassan, Ehab A Ahmed, Brahim BenmokraneAbstract:AbstractThis study investigated the Punching Shear behavior of two-way concrete slabs with glass-fiber-reinforced polymer (GFRP) bars as flexural reinforcement and FRP stirrups (glass or carbon) as Shear reinforcement. A total of 10 full-scale interior slab-column specimens measuring 2,500×2,500 mm, with thicknesses of either 200 or 350 mm, and 300×300-mm square column stubs were fabricated and tested under monotonic concentric loading until failure. These tests aimed at investigating the behavior of GFRP-reinforced two-way concrete slabs reinforced with FRP stirrups as Shear reinforcement and evaluating their contribution to the Punching Shear capacity. The investigated parameters were the flexural reinforcement ratio and the Shear reinforcement type (glass FRP and carbon FRP stirrups) and ratio. The test results revealed that using FRP stirrups as Shear reinforcement increased the Punching Shear strength and deformation capacity of the test slabs. The increased Punching Shear strength and deformation c...
Mohamed Hassan - One of the best experts on this subject based on the ideXlab platform.
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Pilot Experimental Tests on Punching Shear Strength of Flat Plates Reinforced with Stirrups Punching Shear Reinforcement
2017Co-Authors: Mohamed Hassan, Ahmed M. Abdel Rahman, Alaa G Sherif, Moustafa Osman, Asmaa Abdeldaim AhmedAbstract:Flat plates are favor structure systems usually used in parking garages and high-rise buildings due to its simplicity for construction. However, flat plates have some inherent structural problems, due to high Shear stress surrounding the supporting columns which cause a catastrophic brittle type of failure called "Punching Shear Failure". Several solutions are used to avoid Punching Shear failure, including the use of drop panels or Punching Shear reinforcement. The latter is being a more sophisticated solution from the structural ductility, the architectural and the economical point of view. This study aims at investigating the effect of stirrups as Shear reinforcement in enhancing the Punching strength of interior slab-column connections. A total of four full-scale interior slab-column connections were tested up to failure. All slabs had a side length of 1700 mm and 160 mm thickness with 200 mm x 200 mm square column. The test parameters were the presence of Shear reinforcement and stirrups concentration around the supporting column. The test results showed that the distribution of stirrups over the critical Punching Shear zone was an efficient solution to enhance not only the Punching Shear capacity but also the ductility of the connection. Furthermore, the concentrating of stirrups Shear reinforcement in the vicinity of the column for the tested slabs increases the Punching Shear capacity by 13 % compared to the uniform distribution at same amount of Shear reinforcement.
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Punching Shear Behavior of Two-Way Slabs Reinforced with FRP Shear Reinforcement
Journal of Composites for Construction, 2015Co-Authors: Mohamed Hassan, Ehab A Ahmed, Brahim BenmokraneAbstract:AbstractThis study investigated the Punching Shear behavior of two-way concrete slabs with glass-fiber-reinforced polymer (GFRP) bars as flexural reinforcement and FRP stirrups (glass or carbon) as Shear reinforcement. A total of 10 full-scale interior slab-column specimens measuring 2,500×2,500 mm, with thicknesses of either 200 or 350 mm, and 300×300-mm square column stubs were fabricated and tested under monotonic concentric loading until failure. These tests aimed at investigating the behavior of GFRP-reinforced two-way concrete slabs reinforced with FRP stirrups as Shear reinforcement and evaluating their contribution to the Punching Shear capacity. The investigated parameters were the flexural reinforcement ratio and the Shear reinforcement type (glass FRP and carbon FRP stirrups) and ratio. The test results revealed that using FRP stirrups as Shear reinforcement increased the Punching Shear strength and deformation capacity of the test slabs. The increased Punching Shear strength and deformation c...
Radha Sagadevan - One of the best experts on this subject based on the ideXlab platform.
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Prediction of Punching Shear Capacity of Biaxial Voided Slab
2019Co-Authors: Radha SagadevanAbstract:Biaxial voided slab systems are advantageous due to their reduced self-weight, up to 50 % in comparison with the conventional reinforced concrete solid slab. The reduction in the concrete cross sectional area reduces the Shear capacity up to about 40 %. The prediction of Punching Shear capacity in voided slab is not direct unlike in solid slab. This is because the presence of voids alters the critical failure section and hence the Punching load. In the present study, the applicability of conventional method (adopted for solid slabs) in the Indian design standard IS 456: 2000 is explored for predicting the Punching Shear capacity of the voided slab. In addition, three full-scale specimens were tested with sphere shaped voids. Finally, experimental results of present study and test data collected from literature (23 specimens) are compared with theoretical predictions. The estimation of Punching Shear capacity of biaxial voided slab by existing provisions for solid slabs in IS 456 do not lead to satisfactory results. Hence, the presence of voids is considered by adopting an effective concrete area available to resist Punching Shear at the critical section. It is found that the estimated capacity based on IS 456 with effective concrete area is in good agreement with experimentally observed capacity.
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Experimental and analytical investigation of Punching Shear capacity of biaxial voided slabs
Structures, 2019Co-Authors: Radha SagadevanAbstract:Abstract Biaxial voided slab is an emerging slab system which reduces its self-weight up to 50% in comparison with the conventional reinforced concrete solid slab. The reduction in the concrete volume does not affect its flexural capacity significantly, however, it reduces both one-way and two-way (Punching) Shear capacity about 40%. Therefore, an effective way of predicting the Punching Shear capacity is investigated as the presence of voids alters the critical failure section. The applicability of conventional methods for solid slabs in the design standards, such as ACI 318 (2014), EN 1992-1-1 (2004) and IS 456 (2000) to predict the Punching Shear capacity of the voided slab is examined. In addition, eight full-scale specimens were tested with the sphere and cuboid shape of voids. Finally, experimental results of present study and test data collected from literature (33 specimens) were compared with predictions by the relevant code provisions. The estimation of Punching Shear capacity of biaxial voided slab by existing provisions for solid slabs in standards does not lead to satisfactory results. Hence, the presence of voids is considered by modifying the critical section depending on the void location. Further, only the effective concrete area is considered to predict the Punching Shear capacity. After the modifications, the predictions by all three building standards lead to satisfactory results.
