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Nonlinear numerical simulation of punching shear behavior of reinforced concrete flat slabs with shear-heads

Frontiers of Structural and Civil Engineering 2020年第2期14卷 331-356页

作者： Dan VBOMPA Ahmed YELGHAZOULI Department of Civil and Environmental Engineering Imperial College LondonLondon SIV72AZUK

This paper examines the structural response of reinforced concrete flat slabs,provided with flillyembedded shear-heads,through detailed three-dimensional nonlinear numerical simulations and parametric assessments using concrete damage plasticity *** of the adopted nonlinear finite element procedures are carried out against experimental results from three test *** gaining confidence in the ability of the numerical models to predict closely the full inelastic response and failure modes,numerical investigations are carried out in order to examine the influence of key material and geometric *** results of these numerical assessments enable the identification of three modes of failure as a function of the interaction between the shear-head and surrounding *** on the findings,coupled with results from previous studies,analytical models are proposed for predicting the rotational response as well as the ultimate strength of such slab *** recommendations are also provided for the design of shear-heads in RC slabs,including the embedment length and section *** analytical expressions proposed in this paper,based on a wide-ranging parametric assessment,are shown to offer a more reliable design approach in comparison with existing methods for all types of shear-heads,and are suitable for direct practical application.

关键词： non-linear numerical modelling concrete damage plasticity RC flat slabs shear-heads punching shear

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