Design for punching shear in concrete: critical review of Canadian Standard CSA-A23.3-94

1996 ◽  
Vol 23 (2) ◽  
pp. 444-456 ◽  
Author(s):  
Amin Ghali ◽  
Sami Megally
Keyword(s):  
Shear Strength ◽  
Reinforced Concrete ◽  
Key Words ◽  
Critical Review ◽  
Concrete Structures ◽  
Punching Shear ◽  
Shear Reinforcement ◽  
Concrete Plates ◽  
Punching Failure

The requirements of the new Canadian Standard CSA-A23.3-94 "Design of concrete structures" to avoid punching failure of slabs at their connections with columns are critically reviewed. Changes are proposed to avoid unsafe design and to cover practical situations not adequately treated by the Standard. Key words: columns, connections, flat concrete plates, punching shear, reinforced concrete, shear reinforcement, shear strength, stud shear reinforcement, slabs.

Critical review of Canadian Standards Association standard CSA-A23.3-94 provisions for punching shear strength of edge column–slab connections

2003 ◽  
Vol 30 (6) ◽  
pp. 1069-1080 ◽  
Author(s):  
Alaa G Sherif ◽  
Walter H Dilger
Keyword(s):  
Shear Stress ◽  
Shear Strength ◽  
Critical Review ◽  
Punching Shear ◽  
Stress Model ◽  
Test Results ◽  
Shear Reinforcement ◽  
Concrete Plates

The purpose of this paper is to critically review the punching shear strength provisions of the Canadian Standards Association standard CSA-A23.3-94 for edge column–slab connections. Tests from the literature and our own experiments are used to study the most important parameters affecting the punching shear strength of edge slab–column connections. Based on the test results the eccentric shear stress model is evaluated for edge column connections, and improvements are suggested.Key words: edge column–slab connections, flat concrete plates, shear strength, punching shear, shear reinforcement, moment transfer.

scholarly journals Punching Shear Strength of Reinforced Concrete Flat Plates with GFRP Vertical Grids

2021 ◽  
Vol 11 (6) ◽  
pp. 2736
Author(s):  
Min Sook Kim ◽  
Young Hak Lee
Keyword(s):  
Shear Strength ◽  
Reinforced Concrete ◽  
Fiber Reinforced Polymer ◽  
Punching Shear ◽  
Test Results ◽  
Shear Reinforcement ◽  
Flat Plates ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Vertical Grids

In this study, the structural behavior of reinforced concrete flat plates shear reinforced with vertical grids made of a glass fiber reinforced polymer (GFRP) was experimentally evaluated. To examine the shear strength, experiments were performed on nine concrete slabs with different amounts and spacings of shear reinforcement. The test results indicated that the shear strength increased as the amount of shear reinforcement increased and as the spacing of the shear reinforcement decreased. The GFRP shear reinforcement changed the cracks and failure mode of the specimens from a brittle punching to flexure one. In addition, the experimental results are compared with a shear strength equation provided by different concrete design codes. This comparison demonstrates that all of the equations underestimate the shear strength of reinforced concrete flat plates shear reinforced with GFRP vertical grids. The shear strength of the equation by BS 8110 is able to calculate the punching shear strength reasonably for a concrete flat plate shear reinforced with GFRP vertical grids.

Critical review of the CSA A23.3-94 punching shear strength provisions for interior columns

1996 ◽  
Vol 23 (5) ◽  
pp. 998-1011 ◽  
Author(s):  
Alaa G. Sherif ◽  
Walter H. Dilger
Keyword(s):  
Shear Strength ◽  
Critical Review ◽  
Shear Force ◽  
Bending Moment ◽  
Punching Shear ◽  
Design Codes ◽  
Shear Reinforcement ◽  
Model Code ◽  
Shear Design ◽  
Improved Design

The purpose of this paper is to demonstrate that the shear design of slabs according to the relevant Canadian CSA A23.3-94 (and U.S. ACI 318-95) design codes can be unsafe under certain conditions, and to propose improved design equations, some of which should be considered immediately for implementation in the Canadian CSA code. The paper deals with interior slab–column connections, with and without shear reinforcement, subjected to shear force alone or to a combination of shear force and unbalanced bending moment. Some comparisons with the British code BS 8110-85 and the CEB –FIP model code 1990 are also made. Tests reported in the literature and some experiments by the authors provide the basis for this study. Key words: flat concrete plates, slab–column connections, shear strength, punching shear, shear reinforcement, moment transfer.

Critical shear crack theory-based punching shear model for FRP-reinforced concrete slabs

2020 ◽  
pp. 136943322097814
Author(s):  
Xing-lang Fan ◽  
Sheng-jie Gu ◽  
Xi Wu ◽  
Jia-fei Jiang
Keyword(s):  
Shear Strength ◽  
Reinforced Concrete ◽  
Shear Crack ◽  
Concrete Strength ◽  
Weight Ratio ◽  
Punching Shear ◽  
Concrete Slabs ◽  
Crack Theory ◽  
Reinforced Concrete Slabs ◽  
Rc Slabs

Owing to their high strength-to-weight ratio, superior corrosion resistance, and convenience in manufacture, fiber-reinforced polymer (FRP) bars can be used as a good alternative to steel bars to solve the durability issue in reinforced concrete (RC) structures, especially for seawater sea-sand concrete. In this paper, a theoretical model for predicting the punching shear strength of FRP-RC slabs is developed. In this model, the punching shear strength is determined by the intersection of capacity and demanding curve of FRP-RC slabs. The capacity curve is employed based on critical shear crack theory, while the demand curve is derived with the help of a simplified tri-linear moment-curvature relationship. After the validity of the proposed model is verified with experimental data collected from the literature, the effects of concrete strength, loading area, FRP reinforcement ratio, and effective depth of concrete slabs are evaluated quantitatively.

Punching shear strength improved by upward panel in reinforced concrete transfer slabs

2021 ◽  
pp. 103753
Author(s):  
Su-Min Kang ◽  
Su-Jeong Na ◽  
Hyeon-Jong Hwang ◽  
Seung-Il Kim
Keyword(s):  
Shear Strength ◽  
Reinforced Concrete ◽  
Punching Shear

Moment and shear transfer between columns and concrete slabs

1990 ◽  
Vol 17 (4) ◽  
pp. 621-628
Author(s):  
Amin Ghali ◽  
Adel A. Elgabry
Keyword(s):  
Shear Strength ◽  
Structural Design ◽  
American Concrete Institute ◽  
Punching Shear ◽  
Vertical Shear ◽  
Concrete Slabs ◽  
Finite Element Analyses ◽  
Shear Transfer ◽  
Flat Slabs ◽  
Punching Failure

Gravity and horizontal forces cause the transfer of vertical shear and moments between concrete flat slabs and their supporting columns. These forces can cause punching failure. Design equations for safety against punching given in the Canadian Standards Association and the American Concrete Institute codes are critically reviewed. It is shown that the equations give in some cases incorrect stresses which do not satisfy equilibrium. A modification is suggested which makes the equations applicable to all cases. The paper also discusses the codes' approach of sharing the resistance to transferred moment between resistances by flexure and by eccentricity of shear, using the coefficient γv. Comparisons are made with the result of finite element analyses. It is concluded that the code equations, with the suggested modification, are adequate, provided that appropriate values are used for the coefficient γv. Key words: columns, connections, flat concrete plates, moments, punching shear, reinforced concrete, shear strength, slabs, structural design.

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