基于复合IM的钢筋混凝土高墩地震易损性分析  

Seismic vulnerability analysis of reinforced concrete high piers based on composite intensity measure

作　　者：申彦利[1,2] 赵志宏 Shen Yan-li;Zhao Zhi-hong(School of Civil Engineering,Hebei University of Engineering,Handan 056038,China;Hebei Provincial Research Center of Assembly Structural Engineering Technology,Handan 056038,China)

机构地区：[1]河北工程大学土木工程学院,河北邯郸056038 [2]河北省装配式结构工程技术研究中心,河北邯郸056038

出　　处：《工程抗震与加固改造》2021年第4期160-166,共7页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金资助项目(51378169);河北省高等学校科学技术研究重点项目(ZD20161470)。

摘　　要：为更准确地评估桥梁高墩在地震作用下的损伤状态,以考虑高阶振型贡献的复合地震动强度参数IM_(1I&2E)作为易损性分析的地震动强度指标,曲率延性比作为损伤指标,运用有限元分析软件Open SEES建立高墩的数值模型,基于增量动力分析方法(IDA)对桥墩进行非线性动力分析,建立了高墩的地震易损性曲线。结果表明:所建高墩模型不易发生完全损伤破坏,具有较好的安全性;IM_(1I&2E)作为高墩地震易损性分析的地震动强度指标更为合理,可更准确地评估高墩的损伤状态;随墩身高度的增加桥墩抗易损性能力有所提高。可为桥梁高墩的抗震设计及震损评估提供一定参考。In order to evaluate the damage states of high bridge piers under earthquake more accurately,this paper takes the composite intensity measure IM;which considered the contribution of higher modes as the ground motion intensity index,and selects the curvature ductility ratio as damage index for seismic vulnerability analysis.The numerical model of high piers is established by using the finite element analysis software Open SEES.The nonlinear dynamic analysis of high piers carried out based on the incremental dynamic analysis(IDA)method,and then the seismic vulnerability curves of high piers are established.The results show that completely break is not easy happen to the established numerical models;use IM;as intensity measure for seismic vulnerability analysis of high piers is more rational and accurately;the resistance to vulnerability of pier increases with the increasing of pier height.This study may provide the references for seismic design and damage assessment of high bridge piers.

关 键 词：钢筋混凝土桥梁 高墩 地震易损性分析 复合地震动参数 抗震性能 

分 类 号：U442.55[建筑科学—桥梁与隧道工程] U443.22[交通运输工程—道路与铁道工程]