水深对桥梁地震效应的影响分析

Study on the Impact of Water Depth on Seismic Response of Bridge

结合工程实例,以某水库中的连续刚构桥为工程背景,研究水深对桥梁地震效应的影响.计算了桥梁在无水状态下地震的动力响应,模拟有水状态下桥墩与流体的耦合作用,建立了不同水深状态下的有限元模型,计算了不同水深时地震的动力响应并做了对比分析.结果表明,随着水深的增加,水对桥梁结构的内力产生了重大影响,桥梁在地震作用下的应力有增加的趋势,且纵桥向地震波作用下,地震响应比横桥向地震波作用下响应要剧烈.

A continuous rigid frame bridge was taking as engineering background to study the impact of water depth on seismic response of bridge, the dynamic response of the bridge in anhydrous condition was calculated. The fluid-solid interaction between piers and water was simulated and finite element models under different water depth condition were established, the dynamic response analysis was car- ried out in order to compare with anhydrous condition. The results showed that with the increase of water depth, it had a significant impact on the stress of bridge structure. As the water depth in- creased, the stress of the structure was increased, and the seismic response was violent when the ori- entation of seismic waves was along the bridge.