Application of damage–plasticity models in finite element analysis of punching shear. (15th April 2015) - Wosatko, Adam
Highlights: Damage–plasticity models can be used for predicting punching shear behaviour of concrete slabs. FEA results using two damage plasticity models; one implemented in FEAP and the second from ABAQUS are presented. Punching shear FE analysis is sensitive to the representation of the tensile concrete behaviour. Regularization must be adopted to avoid premature predicted failure due to localized cracking. Abstract: The paper presents numerical simulations of punching shear in a reinforced concrete slab-column configuration formerly tested in the laboratory. A brief description of the test program at the University of Waterloo is reported. For the simulation, a symmetric quarter of the test configuration is employed. Full three-dimensional finite element discretized geometry is considered together with elastic–plastic reinforcement embedded as truss elements in concrete. Two regularized numerical models of concrete, formulated within elastic–plastic-damage theories, are applied. The first one, called gradient damage, is refined by an additional averaging equation where gradient enhancement involves an internal length scale. In the second one, called rate-dependent damaged plasticity model, a viscoplastic strain rate is introduced. The results for the first model implemented in FEAP and the second model from ABAQUS are discussed in detail. Different issues of numerical simulation to properly predict punching shear behaviour in the slab-column configuration are presented.