基于PSDM和IDA法的深水隔震桥梁地震易损性分析比较  

A comparative study on the seismic vulnerability of the deep-water isolated bridge based on the PSDM and the IDA methods

作　　者：冼巧玲[1] 冯俊迎 崔杰[1] 

机构地区：[1]广州大学工程抗震研究中心减震控制与结构安全国家重点实验室(培育),广东广州510405 [2]郑州华路兴公路科技有限公司,河南郑州450000

出　　处：《广州大学学报（自然科学版）》2016年第2期1-6,15,共7页Journal of Guangzhou University:Natural Science Edition

基　　金：国家重点基础研究发展计划资助项目(2011CB013606);国家自然科学基金高铁联合基金资助项目(U1334209);长江学者和创新团队发展计划资助项目(IRT13057)

摘　　要：考虑地震动水压力和波浪效应的共同作用,建立了隔震桥梁的弹塑性有限元分析模型,分别基于概率地震需求模型(PSDM)法和增量动力分析(IDA)法形成了桥梁系统及主要构件的地震易损性曲线,并对2种方法所形成的易损性曲线的差异进行了比较分析.研究表明,当桥墩处于弹性阶段时,基于PSDM和IDA法所得到的各损伤极限状态下桥墩的超越概率差别不大;但当桥墩构件进入非线性阶段,由于非线性结果的离散性导致基于PSDM法的需求回归分析的拟合结果失真,而基于IDA法能够很好的避免此种情况的出现;无论是桥墩还是支座,基于PSDM和IDA法计算得出的易损性曲线从轻微破坏到倒塌,2者差异越来越大.The elastic-plastic finite element analysis model of the isolated bridge structure is established by considering seismic hydrodynamic pressure and wave actions.The seismic fragility curves of the bridge system and its major components are formed based on the Incremental Dynamic Analysis（IDA） and Probabilistic Seismic Demand Models（PSDM） respectively.The fragility curves formed by the two approaches were compared and discussed.When the bridge pier is in the elastic stage,there is only little difference in the exceedance probability under damage limit state based on PSDM and IDA.However,when the bridge pier is in nonlinear stage,the discreteness of nonlinear result induces the distortion in the fitting results of the regression analysis of demands by adopting the PSDM method.The IDA-based method can well avoid such discrepancy.The fragility curves obtained by the PSDM differ from those obtained by the IDA,ranging from the state of minor damage to the state of collapse.

关 键 词：隔震桥梁 动水压力 波浪效应 增量动力分析 概率地震需求模型 易损性 

分 类 号：TU311.3[建筑科学—结构工程] U442.5[建筑科学—桥梁与隧道工程]