基于IDA方法的高速铁路连续梁桥易损性分析  

Analysis of Seismic Fragility of High Speed Railway Continuous Beam Bridge Based on IDA Method

作　　者：韩兴[1] 李鑫[1] 向宝山[1] 崔圣爱[1] 祝兵[1] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031

出　　处：《公路交通科技》2016年第2期54-59,共6页Journal of Highway and Transportation Research and Development

基　　金：高速铁路运营混凝土连续桥梁地震风险项目(2013G002-A-2)

摘　　要：大量经验表明高速铁路预应力混凝土桥在地震下的破坏主要体现在桥墩和支座位置。为了得到该种桥型地震下的易损性曲线,利用典型高速铁路连续梁桥为计算实例,采用IDA方法 (增量动力分析法),通过有限元软件Open Sees建立了地震易损性分析模型。根据场地类型,选取20条地震波进行非线性时程分析,通过调幅得到200个计算工况。定义4种破坏极限状态,并通过回归分析建立不同破坏极限状态地震需求和地震动强度指标关系。基于对数正态分布假设绘制各个破坏状态对应的易损性曲线,并通过一阶可靠度理论得到整体易损性曲线。Many experiences show that high speed railway presstressed concrete bridge＇s damage under earthquake mainly reflects in piers and supports. In order to get the fragility curves of this kind of bridge,taking a typical high speed railway continuous beam bridge for example,the seismic fragility analysis model is built by using IDA method and Open Sees FE software. According to the site type,20 seismic waves are selected for nonlinear time history analysis, and 200 calculating conditions are obtained by amplitude modulation. Four failure limit states are defined,and the relations of seismic demand of different damage limit states with seismic intensity indexes are found by the regression analysis. The corresponding fragility curves of different damage state are drawn based on the assumption of logarithmic normal distribution,and the overall fragility curve is obtained by the first-order reliability theory.

关 键 词：梁桥工程 高速铁路连续梁桥 IDA方法 地震易损性分析 OPENSEES 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]