隔震连续梁桥易损性分析中标准差的取值研究  

Research on standard deviation in the vulnerability analysis of isolated continuous girder bridge

作　　者：简涛[1] 马玉宏[2] 赵桂峰[1] 崔杰[1,2] 周福霖[2] 

机构地区：[1]广州大学土木工程学院,广东广州510006 [2]广州大学工程抗震研究中心,广东广州510405

出　　处：《地震工程与工程振动》2016年第2期93-101,共9页Earthquake Engineering and Engineering Dynamics

基　　金：国家重点基础研究发展计划973项目(2011CB013606);国家自然科学基金项目(51578170);国家自然科学基金高铁联合基金重点项目(U1334209);长江学者和创新团队发展计划项目(IRT13057);广州市属高校科技计划项目(1201421152)~~

摘　　要：目前,很多学者在进行结构地震易损性分析计算标准差时,采用按照HAZUS99直接取值的方法或直接对所研究对象进行具体计算的方法,但两种方法的易损性分析结果是否有差别,差别的大小如何,采用简便的直接取值法精度如何,是否适用于隔震桥梁等问题有待于深入研究。建立3个隔震连续梁桥模型,采用IDA分析方法进行非线性时程分析,通过回归分析得到地震动强度与桥梁构件地震需求的关系;通过弯矩-曲率分析和pushover分析确定墩柱的损伤指标——墩顶位移角;对桥梁墩柱、隔震支座及整体系统进行地震易损性分析来研究标准差的取值问题。结果表明:标准差的实际计算值与直接取值0.5的误差大部分超过10%;从构件的易损性曲线和隔震桥梁系统的易损性曲线来看,按照实际计算的方法和直接取值0.5的方法得到的结果误差相差也比较大,说明以PGA为地震动参数时,直接取0.5计算隔震连续梁桥相应的易损性是不合理的。At present,during the structural seismic vulnerability analysis,there are two methods to calculate standard deviation,one method is using the value from HAZUS99 directly,the other one is calculating the specific value according to the response of the actual bridge. But,whether the results of seismic vulnerability analysis from two method are the same or not. Are the difference of these results large or small？ And whether using the simple direct value from HAZUS99 can meet the requirement,and be applied into the isolated bridge or not. These problems need to be further studied in detail. In this paper,three isolated continuous girder bridge models were established,nonlinear time history analysis of the bridges were carried on using IDA analysis method,and the seismic demand of the isolated bridge was obtained through the regression analysis. The damage index,namely top drift of bridge pier was determined through the moment curvature analysis and pushover analysis and then standard deviation was ana-lyzed through seismic vulnerability analysis of the bridge pier,the isolated bearings and the overall system. Results show that： most of errors of two methods are more than 10%,and the errors of the vulnerability curve of the components or the overall system respectively obtained from two methods are also larger,which indicate that it is unreasonable to use 0. 5 from HAZUS99 directly during the vulnerability analysis of the isolated bridge when PGA is regarded as ground motion parameters.

关 键 词：隔震桥梁 易损性分析 变异系数 取值分析 超越概率 

分 类 号：U442.55[建筑科学—桥梁与隧道工程] U448.215[交通运输工程—道路与铁道工程]