基于LS-DYNA的车辆对桥墩撞击力仿真分析

车辆撞击跨线桥桥墩的事故时有发生,为探究不同车辆载重和撞击角度对撞击力的影响,运用LS-DYNA对车辆撞击桥墩过程进行仿真模拟,采用标准车辆模型和圆端形桥墩模型,基于3种车速赋予车辆不同载重,计算得到撞击力随车辆载重和撞击角度的变化情况,并探求不同车辆载重下撞击力的变化规律。结果表明:车辆载重和撞击角度对撞击力的峰值和持续时间有一定影响,并且车辆对桥墩的撞击力超出规范要求。

Dynamic Simulation Analysis Based on LS-DYNA about Impact Force on Bridge Pier Caused by Vehicle

A vehicle dashing against a bridge pier can often be seen at an overpass bridge.For the purpose of exploring the changes of the impact force under different vehicle loads and from different impact angles,the LS-DYNA was employed to simulate the process of a vehicle dashing against a bridge pier,and the standard vehicle model and round-ended pier model were adopted.And by using three kinds of vehicle speeds with different vehicle loads and after calculation,the changes of impact forces with both the changes of vehicle loads and impact angles were ascertained,and the change rule of impact forces under different vehicle loads was researched.The results show that the peak and duration time of impact force curve are influenced by vehicle loads and by impact angles to a certain degree,and the maximum impact force exceeds the provision stipulated in relevant standard.