Finite Element Simulation on Punching Shear Behavior of Reinforced Concrete Slabs

A K M Jahangir Alam,Khan Mahmud Amanat

doi:10.5402/2012/501816

A K M Jahangir Alam, Khan Mahmud Amanat

Open Access

https://doi.org/10.5402/2012/501816

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Abstract

A finite element simulation for experimental punching shear behavior of reinforced concrete slab is presented in this paper. The numerical simulation is based on previously tested 15 reinforced concrete model slabs. Finite element analysis of reinforced concrete slabs subjected to punching load is evaluated and results are compared with experiments. This study involves development of a nonlinear strategy which implements solution for a realistic description of the deflection, load carrying capacity and crack, pattern related to punching shear of RC slabs for several types of slab thickness, edge restraints, and reinforcement ratio. It has been shown that the load versus. deflection diagram and ultimate load capacity obtained from FE analysis closely match with the experimental results. Comparison of crack pattern of the slab also shows good agreement. It has been shown that using appropriate method and material for numerical simulation, significant benefit can be achieved using finite element tools and advanced computing facilities in obtaining safe and optimum solutions without doing expensive and time-consuming laboratory tests.

Highlights

For the design of punching shear, code provisions rely mostly on empirical methods derived from the test results on supported conventional [1] and thin slab specimens [2]
The present study comprised of a planned series of finite element analysis to simulate test results on restrained as well as unrestrained slabs, variation of flexural reinforcement, and slab thickness
It has been found that ultimate punching shear capacity and behavior of slab samples are dependent on restraining action of slab edges [10], flexural reinforcement ratio [11, 12], slab thickness and span-to-depth ratio of the slab [3, 13]

Summary

Introduction

For the design of punching shear, code provisions rely mostly on empirical methods derived from the test results on supported conventional [1] and thin slab specimens [2]. Some of the present-day code provisions usually specify the punching shear strength as a function of concrete strength alone. These codes do not take adequate account of the possible role of specimen size, edge restraint, as well as effect of longitudinal reinforcement [3, 4]. Extensive experimental data and analysis using possible role of restraint, effect of reinforcement, and slab thickness should be considered in the code provision. The present study comprised of a planned series of finite element analysis to simulate test results on restrained as well as unrestrained slabs, variation of flexural reinforcement, and slab thickness. It is very important that before practical application finite element analysis methods should be verified and validated comparing the analysis results with reliable experiment data

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Results

Discussion

Conclusion