滚石撞击下混凝土桥墩损伤仿真模拟

Damage Simulation of Concrete Pier under Impact of Rolling Stones

运用LS-DYNA软件开展了滚石撞击下双柱式桥墩动力响应和损伤形式的仿真分析。由撞击力时程曲线可见,撞击力最大值随滚石初始动能增大而增大,撞击力曲线的最大值和撞击接触面积相关。由滚石对桥墩的撞击损伤研究表明:滚石撞击下桥墩的损伤形式与损伤量与滚石的动能、速度和撞击截面密切相关,在滚石速度与撞击接触面积相同的情况下,桥墩的损伤量随滚石的动能增加而增大;撞击面面积越小,损伤越容易在碰撞撞击面正面发生。

The software of LS-DYNA was adopted to conduct the numerical simulation for the dynamic response and damage mode of a dual-column bridge pier under the impact of rolling stones. From the time-history curves of impact force, it could be found that the maximum impact force increased as the initial kinetic energy of the rolling stones increased, and the maximum value of impact curve was related with the size of the contact area during impact. The research on damage of bridge pier caused by rolling stones indicates that the damage mode and damage scope of the pier are pertinent to kinetic energy of the rolling stone, the impact velocity and the contact area. When the impact velocity of the rolling stones and the contact area of impact are kept constant, the damage scope of the pier becomes larger as the initial kinetic energy of the rolling stone increases. With a smaller contact area of impact, the damage is most likely to be found on the right side of the impact.