桥台背墙对连续梁桥地震易损性的影响  

Influence of abutment back wall on continuous girder bridge's seismic fragility

作　　者：张玥[1] 刘传森 宋飞 ZHANG Yue;LIU Chuan-sen;SONG Fei(School of Architecture and Civil Engineering,Xi'an University of Science and Technology,Xi'an 710054,China)

机构地区：[1]西安科技大学建筑与土木工程学院,西安710054

出　　处：《吉林大学学报（工学版）》2023年第5期1372-1380,共9页Journal of Jilin University:Engineering and Technology Edition

基　　金：中央高校基本科研业务费专项项目(300102210513);陕西省教育厅科研计划项目(18JK0502)。

摘　　要：为探究桥台背墙对连续梁桥各主要构件地震易损性的影响,以一座四跨连续梁桥为例,使用OpenSees软件分别建立是否考虑桥台背墙的桥梁非线性模型。根据场地类型,从PEER数据库中筛选了100条地震波,对两模型分别进行计算,使用云图法建立各构件易损性曲线。研究表明:桥台背墙对连续梁桥的各构件抗震性能有显著影响;桥台背墙对各构件地震易损性的影响随着损伤程度的增大而增大,并在完全损伤状态,影响程度达到最大,桥墩易损性均值偏差达到85.5%;在各级损伤状态下,桥台背墙对桥墩的地震易损性影响最大。因此,建议在分析连续桥梁结构抗震性能时,考虑桥台背墙。To explore the impact of the abutment back wall on the seismic fragility of each continuous girder bridge component,two nonlinear models of the four-span continuous girder bridge with or without back wall were built separately using OpenSees software.Models were analyzed by 100 seismic waves selected from PEER(Pacific Earthquake Engineering Research Center)database,based on class II site.Then the fragility curves of each component were established by cloud method.The results show that the abutment back wall has significant effect on the seismic fragility of continuous girder bridge.The effect of the abutment back wall on seismic responses of each component increases with the increase of the damage degree.In the state of complete damage,the influence degree reaches maximum,and the mean deviation of pier fragility reaches 85.5%.Considering the abutment back wall have the greatest influence on the seismic response of piers.Therefore,it is suggested that the abutment back wall should be considered when analyzing the seismic performance of continuous bridge structures.

关 键 词：桥梁工程 连续梁桥 桥台背墙 地震易损性 云图法 易损性均值 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]