Simulation of Loading Rate Effects on Dynamic Brittle Failure of Concrete Structures Using a Two-Scale Damage Model

摘要

In this contribution, we use a dynamic damage model to simulate the failure of concrete structures at different loading rates. The damage model is fully deduced from the energy criterion describing the dynamic mode I propagation of microcracks using the asymptotic homogenization method. The influence of the rate of loading on the failure mode is investigated by performing Finite Element computations and the obtained numerical results are compared with the experimental ones. Compact tension and L-specimen tests are considered for concrete material. The simulations show that the loading rate essentially determines the macroscopic crack trajectory and the branching pattern. These results are in good agreement with the experimental observations.