陇南公路总段桥梁震害及易损性分析

Seismic damage and vulnerability analysis of bridges along Longnan Highway

陇南公路总段所辖百余座大中小桥,在5.12四川汶川特大地震中遭受了不同程度的损害。本文首先介绍了这些桥梁的震害和现场鉴定情况,然后为验证桥梁易损性理论分析与现场科学考察所得震害等级的一致性,在收集大量所需参数的基础上,采用公路桥梁震害预测经验统计法,对其中154座有详备资料的桥梁进行了易损性分析,并与科考结果进行统计意义上的对比,从较好的一致性中验证了桥梁震害预测结果。最后在公式修正和桥梁加固等方面提出了建议。

There are hundreds of bridges along Longnan Highway.They have suffered damage at varying degrees in 5.12 great Wenchuan earthquake in Sichuan Province of China.This paper summarizes and,introduces seismic damage character and field identification of the situation for these bridges firstly.Then in order to test the consistency of damage rating,which is got from theoretical vulnerability analysis of bridges and field research expedition respectively,on the basis of collecting the large number of parameters required,vulnerability analysis of 154 bridge group having detailed information is done by using the method of highway bridges＇ earthquake damage prediction.Then we make statistic compare with the bridge information of site investigation,test the results of earthquake damage prediction and propose the idea of formula modification and bridge strengthening,etc at last.