板式橡胶支座梁桥抗震韧性评估  

Seismic resilience assessment of unbonded rubber-bearing supported girder bridges

作　　者：周连绪 吴学平 王晓伟[1] 叶爱君[1] Zhou Lianxu;Wu Xueping;Wang Xiaowei;Ye Aijun(State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China;China Railway Major Bridge Reconnaissance and Design Group Co.,Ltd.,Wuhan 430050,China)

机构地区：[1]同济大学土木工程防灾减灾全国重点实验室,上海200092 [2]中铁大桥勘测设计院集团有限公司,武汉430050

出　　处：《东南大学学报（自然科学版）》2024年第6期1386-1394,共9页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(52008155,52178155,52378183);中央高校基本科研业务费专项资金资助项目(22120240235)。

摘　　要：以我国量大面广的板式橡胶支座梁桥为研究对象,开展板式橡胶支座梁桥抗震韧性评估方法研究.首先阐明了桥梁的通用抗震韧性评估框架,包括桥梁非线性建模、面向韧性评价的地震易损性曲线建立和韧性评估3个模块.其次,针对典型板式橡胶支座梁桥,在OpenSees平台建立非线性有限元模型,进行增量动力分析,采用支座残余位移和峰值位移界定桥梁的损伤状态,构建板式橡胶支座梁桥地震易损性曲线.然后,结合不同损伤状态下板式橡胶支座梁桥的损伤概率和对应的构件功能恢复模型,生成给定PGA下的功能恢复曲线.最后,以等效的桥梁总关闭天数为韧性指标,生成桥梁韧性随PGA的变化曲线.结果表明,当PGA从0.6g增加到1.0g时,桥梁韧性快速下降,等效的桥梁总关闭天数从15 d增加到58 d.The seismic resilience assessment for the widespread unbonded laminated rubber bearing supported highway girder bridge in China is carried out.Firstly,seismic resilience assessment framework for bridges is introduced,which includes the finite element modeling for the bridge considering nonlinearity,the seismic fragility curve towards resilience assessment,and seismic resilience assessment.Secondly,the nonlinear finite element model of a typical laminated rubber bearing supported girder bridge is generated in OpenSees,and the incremental dynamic analysis(IDA)is performed.The damage state of the bridge is defined according to the residual displacement and peak displacement of the unbonded laminated rubber bearing.The seismic fragility curve of the bridge is obtained.Then,the functionality recovery curve of the bridge at a given peak ground acceleration(PGA)is generated by combining the failure probability and the restoration model of the bridge at the individual damage state.Finally,taking an equivalent downtime of the bridge as the seismic resilience index,the seismic resilience curve of the bridge varying with the PGA is obtained.The results show that the seismic resilience of the bridge declines rapidly when PGA increases from 0.6 g to 1.0 g,and the equivalent downtime of the bridge increases from 15 to 58 d.

关 键 词：桥梁工程 抗震韧性 板式橡胶支座 易损性曲线 功能恢复曲线 韧性指标 

分 类 号：TU997[建筑科学—市政工程] U447[建筑科学—桥梁与隧道工程]