考虑内力状态的大跨高墩连续刚构桥地震易损性分析  

Seismic Fragility of the Long-span,Continuous,Rigid-frame Bridge with High-rise Pier Involving the State of the Internal Force

作　　者：石岩[1] 张智超 李军 王文仙 王瑞 SHI Yan;ZHANG Zhichao;LI Jun;WANG Wenxian;WANG Rui(School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,Gansu,China)

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050

出　　处：《地震研究》2022年第1期8-16,共9页Journal of Seismological Research

基　　金：国家自然科学基金项目(51908265、51768042);红柳优秀青年人才资助计划(04-061810)联合资助.

摘　　要：为研究考虑内力状态的连续刚构桥的地震反应及易损性情况,以一座非规则大跨高墩连续刚构桥为对象,基于MIDAS/Civil和OpenSees平台分别进行施工过程模拟和非线性动力分析,并采用等效荷载法将内力等效荷载附加到OpenSees模型上,使其处于对应的等效内力状态;选取40组典型的速度脉冲型近断层地震动记录为输入,采用增量动力分析法进行考虑内力状态的地震易损性分析,对比分析了考虑内力状态与否对连续刚构桥地震易损性的影响。结果表明:所采用的内力等效荷载方法能够较好地考虑成桥内力状态;考虑内力状态与否对成桥阶段主墩和引桥墩的地震易损性具有很大影响,不考虑内力状态时将严重低估主墩和引桥墩的地震损伤概率。To investigate seismic fragility of the continuous,rigid-frame bridge involving internal force state,an irregular,long-span,continuous,rigid-frame bridge with high piers was selected as the background project.The simulation of construction process and the analysis of nonlinear dynamic were carried out by using MIDAS/Civil and OpenSees platforms.Then an equivalent load method was used to apply the equivalent loads of internal force to the OpenSees model.Forty groups of typical near-fault ground motion records were selected for input,then the seismic fragility of the bridge with additional equivalent loads was analyzed through OpenSees by the Incremental Dynamic Analysis method.Finally,the influence of internal force state on the seismic fragility of the continuous,rigid-frame bridge was compared and analyzed.The results show that the state of the internal force of the main bridge can be accurately calculated and simulated by the formulas for the equivalent loads of the internal force,and the seismic fragility of the main piers and approach piers is affected by the state of the internal force.If the state of the internal force is not taken into consideration,the seismic damage probability of the main pier and the approach pier will be underestimated.

关 键 词：连续刚构桥 施工过程 等效荷载法 成桥内力状态 地震易损性 

分 类 号：U448.23[建筑科学—桥梁与隧道工程]