EVALUATION OF CONCRETE MATERIAL MODEL FOR VESSEL-BRIDGE COLLISION SIMULATION AND ITS APPLICATION

摘要

When nonlinear finite element method is employed to simulate vessel-bridge collision, pier or pile-cap is often modelled with rigid material model or elastic material model. Thus, the dynamic responses of bridge may not be captured accurately. In this paper, the rational concrete material model is validated for vessel-bridge collision simulation. However, the tests of vessel-bridge collisions are rather rare at present. Thus, low-velocity impact tests of reinforced concrete beam are used to evaluate the material models. Several candidate material models are analyzed by the basic theory of concrete constitutive model firstly. The more appropriate models are adopted to simulate the lowvelocity impact test, and then compared with each other in the performance. Finally, the best performance material model (Mat_159 in LSDYNA) is determined to simulate ship-bridge collision. The results show that the structural displacement is larger than that of using the elastic material model.