Finite-Element Analysis of Reinforced Concrete Plates Subjected to Repeated Impact Loads

This paper adapts and validates a three-dimensional finite element (3D-FE) model of reinforced concrete (RC) plates subjected to repeated low-velocity impact loads that were formerly tested by the authors. A brief description of the experimental tests that are required to facilitate the finite element (FE) modeling is provided. Numerical simulations have been performed using an explicit FE commercial code. A concrete damage plasticity (CDP) model is adapted to consider nonlinearity, stiffness degradation, and strain rate effects of concrete. The classical metal plasticity model is used to define the full response of the steel reinforcement. CDP parameters are calibrated based on the test results of a control specimen. Thereafter, the predictive capability of the calibrated model has been demonstrated by simulating different plates with varied steel reinforcement ratios and arrangements. The numerical results showed that computed responses are sensitive to CDP parameters related to the plastic expansion, and damage parameters. Additionally, strain rate effect inclusion is critical to properly predict the punching shear failure pattern. Results confirmed also the ability of the calibrated model to predict the response of RC structures under low-velocity loading conditions.