某隔震连续梁桥的地震失效模式研究  

Failure Pattern Analysis of an Isolated Continuous Bridge

作　　者：刘晗[1] 谭平[2] 张尚荣[3] 周福霖[1,2] 

机构地区：[1]武汉大学土木建筑工程学院,湖北武汉430072 [2]广州大学减震控制与结构安全国家重点实验室(培育),广东广州510405 [3]宁夏大学土木与水利工程学院,宁夏银川750000

出　　处：《四川大学学报（工程科学版）》2016年第5期42-49,共8页Journal of Sichuan University (Engineering Science Edition)

基　　金：教育部创新团队项目资助(IRT13057);国家重点基础研究发展计划资助项目(2011CB013606)

摘　　要：针对传统可靠度分析对隔震桥梁地震失效模式识别的局限性,提出一种基于IDA分析和加权秩和比法的失效模式判别方法,结合改进的Park-Ang损伤模型,给出具有统计意义的隔震桥梁的地震损伤失效模式,为隔震桥梁优化设计提供依据。以某6跨隔震连续梁桥为例,基于opensees建立桥梁结构有限元模型,分析得到基于加权秩和比的失效模式,并与结构的最弱失效模式进行对比。针对最弱失效模式,分析隔震支座屈重比对结构时程响应的影响,得出该隔震桥梁的最优屈重比。结果表明:基于加权秩和比法的失效模式为中间墩支座最先失效,且所有隔震支座先于桥墩失效,与最弱失效模式的规律一致,该隔震桥梁的最优屈重比为7%,优化后桥梁的失效PGA增大了0.05g。According to limitations of traditional reliability analysis on the identification of failure pattern of isolated bridges, a distinguish method based on IDA analysis and Weighted RSR method, combined with improved Park-Ang damage model, was presented to estimate the statistical failure pattern of isolated bridges, which could provide a basis for the optimization of structural design. A finite element model for an isolated continuous bridge with six spans was developed within the environment of opensees, and then analyzed to obtain a statistic failure pattern. The obtained failure pattern was compared with the weakest failure mode of the isolated bridge. The weakest failure mode was optimized by selection of an optimal flexion weight ratio. The results showed that the isolation beatings on middle pears fail firstly, and all the bearings fail before piers. The optimal flexion weight ratio of this isolated bridge was 7% , which made the failure PGA increased by 0. 05g.

关 键 词：桥梁隔震 损伤模型 失效模式 IDA分析 OPENSEES 

分 类 号：TU318[建筑科学—结构工程]