考虑行波效应的高墩刚构桥地震易损性分析

Seismic vulnerability analysis for high pier rigid bridge considering traveling wave effect

基于传统可靠度理论,结合IDA方法和大质量法,将空间效应引入地震易损性分析,提出了实现考虑行波效应的桥梁地震易损性评估方法。以一座墩高不一致的双肢薄壁高墩刚构桥为算例,建立系统近场和远场地震易损性曲线。结果表明:评估桥梁系统地震易损性时,宜考虑行波效应,否则可能高估其抗震性能;与远场地震易损性相比,近场地震易损性受行波效应影响显著;与矮墩易损性相比,高墩易损性对行波效应敏感。

A new bridge seismic vulnerability assessment methodology considering traveling wave effect is proposed based on the traditional theory of reliability, and incorporating incremental dynamic analysis （IDA） method and large mass method （LMM）. The far-field and near-field earthquake vulnerability curves are built for a rigid bridge with flexible twin piers in different height. The results show that the travelling wave effect should be considered when assessing the seismic vulnerability of the bridge otherwise the seismic performance maybe be overestimate. Compared with the far-field earthquake vulnerability, near-field earthquake vulnerability is influenced by the trave- ling wave effect significantly. The vulnerability of high pier is sensitive to the traveling wave effect compared with the vulnerability of the short pier.