川藏线不同墩高铁路简支梁桥地震易损性分析  

Seismic vulnerability analysis of railway simple supported bridge with different height piers of the Sichuan-Tibet line

作　　者：马腾[1] 单德山[1] 董俊[1] 张二华[1] MA Teng SHAN Deshan DONG Jun ZHANG Erhua(College of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031

出　　处：《四川建筑科学研究》2016年第5期56-61,共6页Sichuan Building Science

基　　金：国家重点基础研究发展计划(2013CB036300-2);中铁二院控科研项目(院计划13164191(13-15))

摘　　要：基于地震易损性分析的理论方法,建立了川藏线铁路简支梁桥的分析型地震易损性模型。根据桥梁结构自身不确定参数,采用拉丁超立方体方法进行抽样并建立桥梁分析样本库。利用实测的汶川地震动对各样本进行了非线性动力时程分析,获得结构各构件的最大动力响应数据,通过回归分析建立了地震动强度和桥梁构件地震需求之间的关系。在确定结构不同构件各损伤状态对应的极限状态后,基于对数正态分布假设,采用传统可靠度理论建立了桥梁各构件地震易损性曲线,获得的易损性曲线可以为川藏线抗震设计提供依据。Analytical seismic vulnerability model of typically simply supported girder bridge was developed using the method of seismic vulnerability analysis theory. According to the uncertain parameters of the bridges,the bridge analysis sample library was established by using Latin hypercube sampling method. Nonlinear dynamic transient analysis was preformed using the Wenchuan earthquake ground motions,in which the responses of bridge components were recorded. By using the regression analysis method,a relationship between the ground motion intensity and components seismic demand was established. Once the limit states of bridge components at each bridge damage state were determined,seismic fragility curves were generated based on the logarithmic normal distribution assumption and the reliability theory and calculation. The seismic vulnerability curve of Sichuan-Tibet highway can provide basis for seismic design.

关 键 词：简支梁桥 川藏铁路 易损性曲线 地震需求 

分 类 号：TU352.1[建筑科学—结构工程] U447[建筑科学—桥梁与隧道工程]