动水压力影响下考虑SSI效应的桥墩结构地震响应分析

Seismic Response Analysis of Bridge Pier Structure of Considering SSI Effect under Dynamic Water Pressure

基于Morison方程法,采用附加质量考虑动水压力的影响,利用ABAQUS软件计算平台建立了动水压力作用下刚性地基桥墩和考虑SSI效应的桥墩结构,对动水压力作用下考虑和不考虑SSI效应时桥墩的地震响应进行了比较,分析了考虑SSI效应的桥墩的地震响应随水深的变化规律。结果表明:动水压力作用会增大桥墩的地震响应,其受桥墩入水深度的影响;当考虑SSI效应后,动水压力作用对桥墩自振频率折减和地震响应增大作用有所降低,但仍不能忽视动水压力作用。

Based on the Morison equation method, the influence of the dynamic water pressure was considered by using the additional mass. The rigid foundation bridge pier and the bridge pier structure taking into account SSI effect under the dynamic water pressure were established by using ABAQUS software computing platform.Then the seismic responses of the bridge pier structure with and without consideration of SSI effect were compared under the dynamic water pressure. Finally, the change regulation of seismic response of bridge pier at different water depths considering SSI effect was analyzed. The research results show that under the dynamic water pressure, the seismic response of the pier increases, and it is influenced by underwater penetration of bridge pier; when considering SSI effect, the dynamic water pressure on the decrease of the natural vibration frequency and the increase of the seismic responses are reduced. However, the dynamic water pressure can not be neglected.