基于失效树的连续刚构桥体系可靠度研究  

Research on the reliability of continuous rigid frame bridge system based on failure tree

作　　者：刘梦莹[1] 徐岳[1] 

机构地区：[1]长安大学公路学院,陕西西安710064

出　　处：《合肥工业大学学报（自然科学版）》2014年第11期1341-1345,共5页Journal of Hefei University of Technology：Natural Science

基　　金：国家留学基金委资助项目(220021130090)

摘　　要：文章讨论了针对连续刚构桥破坏机理和失效准则,采用失效树的方法进行桥梁体系可靠性分析;运用全局临界强度分枝-约界准则识别结构体系主要失效模式,以JC法计算各主要失效模式的可靠指标,结合失效模式的相关性,提出了连续刚构桥体系可靠指标计算流程。以某连续刚构桥为例,分析了不同构件的失效类型及失效顺序,绘制了相应失效树图形,计算了连续刚构桥主要失效模式的可靠指标、失效概率及桥梁结构体系可靠性。研究结果表明各失效模式间的相关性非常高,主梁比桥墩更易失效,给出的连续刚构桥体系可靠指标计算流程可以全面反映连续刚构桥体系失效问题。T he continuous rigid frame bridge failure mechanism and failure criterion are studied ,and the bridge system reliability analysis is conducted by using the method of failure tree .The major fail‐ure modes of the structural system are identified by the global threshold intensity branch‐and‐bound standard ,and the reliability index of each major failure mode is calculated by using JC method .Based on the correlation of failure modes , the reliability index calculation procedure of continuous rigid frame bridge system is put forward .Finally ,taking a continuous rigid frame bridge as an example , the different types of component failure and failure sequence are analyzed ,the corresponding failure tree graph is draw n ,and the reliability index ,failure probability of the major failure modes and bridge structure system reliability are calculated .The results show a very high correlation between the vari‐ous failure modes ,the main beams are more likely to fail than piers ,and the reliability index calcula‐tion procedure of continuous rigid frame bridge system proposed in this paper can comprehensively re‐flect continuous reflect frame bridge system failures .

关 键 词：桥梁工程 连续刚构桥 失效树 失效模式 相关性 可靠指标 

分 类 号：U441.4[建筑科学—桥梁与隧道工程]