大跨度混凝土梁斜拉桥横向地震作用易损性分析  

Fragility Analysis of Long-span Concrete Cable-stayed Bridge under Lateral Seismic Loads

作　　者：薛成凤[1] 刘来君[1] 武芳文[1] 

机构地区：[1]长安大学公路学院,陕西西安710064

出　　处：《地震研究》2017年第1期65-69,共5页Journal of Seismological Research

基　　金：国家自然科学基金(51408040)资助

摘　　要：以某大跨斜拉桥为例,利用SAP2000建立有限元模型,基于结构性能目标,探讨桥梁构件损伤标定方法,并采用IDA的倒塌易损性分析方法,对该斜拉桥进行横向的地震易损性分析,最后采用能力需求比模型法拟合出主塔的易损性曲线。研究结果表明,在横向地震作用下,索塔墩顶截面、上塔柱底部成为易损截面的概率增大,连接主梁的中塔柱底部截面出现完全破坏的概率增大。In this paper, based on a long -span cable -stayed bridge, a finite element model is established by using SAP2000. Based on structural objectives, we studied on calibration method for bridge structure damage. By using collapse vulnerability analysis method which is based on IDA, we analyze the lateral seismic fragility of cable - stayed bridge. Finally, the seismic fragility curves of the main tower can be fitted by using capacity requirement modeling method. The research indicate that under the transverse seismic waves, towers became more vulnerable at the section of top and the bottom of upper tower column. The bottom of mid tower connecting the girder tends to be completely destroyed.

关 键 词：斜拉桥 易损性分析 损伤标定 超越概率 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]