Reconnaissance of Combined Punching Shear with Flexure in RC Slabs with Different Boundary Conditions

Document Type : Original Article

Authors

1 Structural Engineering Department, Faculty of Engineering, Tanta University.

2 Structural Engineering Department, Faculty of Engineering, Tanta University, Egypt.

3 Structural Engineering Departement, Faculty of Engineering, Tanta University.

Abstract

Many of the previous researchers dealt with punching mechanism as a local failure of two way action in slabs. Focus was devoted to flat slabs exhibiting rigid body separation of punched zone. Unbalanced moment was an important parameter especially for exterior and corner columns. However, limited attention was directed to interaction of flexure and punching of slabs with different boundary conditions. This situation is typical for small patch loads of truck wheel print on roadway girders. In this paper, a brief summary is presented to capture the fundamental aspects in the literature. Experimental program has been conducted for 1700x1700x120 mm RC slabs made of high performance concrete. Five specimens were centrally loaded with 150x150 mm patch under monotonic quasi static force up to failure. The boundary condition simulated: (1) simply supported along two parallel sides , (2) simply supported along three sides , (3) simply supported along four sides , (4) simply supported along two adjacent sides and opposite corner support and (5) on four corner supports. Moreover , nonlinear finite element analysis was carried out to model the case studies and to conduct parametric investigation regarding the effect of tensile reinforcement ratio , the presence of compression steel mesh of partial or full span , the influence of concrete grade and the size of the slab to account for different combination of punching shear and flexural moment. Finally, analytical formulas and code equations were examined for the considered cases.

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International Journal of Advances in Structural and Geotechnical Engineering
Volume 01, Issue 03 - Serial Number 2022017
Special Issue for ICASGE'15 & ICASGE'17-3
August 2017

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