桥墩在船舶撞击作用下的损伤仿真研究

SIMULATION OF DAMAGE FOR BRIDGE PIER SUBJECTED TO SHIP IMPACT

评述了考虑应变率效应和材料损伤的HJC混凝土模型,就材料参数的取值进行了讨论。通过刚性球撞击混凝土板的例子,讨论了HJC模型中损伤参数的敏感性,并据此确定了计算中采用的HJC模型参数。对一艘万吨级的散货船与桥墩的碰撞过程进行了仿真,给出了船舶与桥墩的碰撞力时程以及桥墩损伤形态。结果表明,由于混凝土的破损,船舶对桥墩的撞击力峰值显著降低。为获得真实的结果,在船舶与薄壁桥墩碰撞的仿真分析中应考虑混凝土的动态损伤特征。

A review is made for HJC concrete model which includes strain rate effects and material damage. Sensitivity of damage parameters in HJC model are discussed through a collision of a rigid ball with a concrete plate, and the parameters used in HJC concrete model are determined. A scenario of a 12000 DWT bulk cargo collision with a bridge pier is simulated by the software of LS-DYNA, and the time history of ship collision force and the damage of the bridge pier are presented. The results show that the peak value of ship collision force decreases remarkably due to the failure of concrete. Damage characteristic of concrete should be taken into account to achieve objective result in the simulation of ship collision with thin-wall bridge pier.