3-D non-linear finite element analysis based on a 20 node isoparametric element is used to predict the punching shear failure of flat slabs at an interior column-slab junction. Nearly 90 slabs covering a very wide range of variables including slabs with and without shear reinforcement and tested by different investigators were analysed . A non-linear elastic isotropic model, proposed by Kotsovos, is used to model concrete behaviour, while steel is modelled as an embedded element exhibiting elastic-perfectly plastic response. Allowance is made for shear retention in concrete after cracking and also for tension stiffening. Only fixed direction, smeared cracking modelling is adopted. Particular attention was paid to ensure that the predicted mode of failure as judged by crack pattern, strain in steel and concrete corresponded closely to that observed in the experiments. Good agreement was observed between predicted ultimate load and the experimentally measured load. It is concluded that the present program can confidently be used to predict the failure load in practice.

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