荷载增量法的改进及应用  

Improvement and Application of Load Increment Method

作　　者：肖龙[1,2] 侯建国[1] 董黛 安旭文[1] 李茂华[3] 

机构地区：[1]武汉大学土木建筑工程学院,武汉430072 [2]中信建筑设计研究总院有限公司,武汉430014 [3]中国电力科学研究院,北京100055

出　　处：《武汉理工大学学报（交通科学与工程版）》2013年第5期1066-1070,共5页Journal of Wuhan University of Technology（Transportation Science & Engineering）

摘　　要：结构系统可靠度分析的关键问题是结构系统主要失效模式的识别.基于荷载增量法,提出了3项改进策略.改进后的荷载增量法考虑了荷载和抗力的变异性对约界参数的影响,删除了冗余失效模式,简化了全局约界的实现步骤,在不遗漏主要失效模式的基础上提高了识别效率.通过10杆桁架和输电线路杆塔结构主要失效模式识别的算例分析,验证了改进后的荷载增量法的正确性和合理性.Enumerating significant failure modes is the key problem of structural reliability analysis.Based on load increment method,three improvement strategies are proposed.Firstly,functional relationship between bounded parameters and variation coefficient of load and resistance is given.Secondly,redundancy failure modes are deleted.Thirdly,approach of global boundary is simplified.Confirmed by trial calculation,accuracy can meet the need of engineering demand and scientific research.These strategies can improve the enumeration efficiency of dominant failure modes and laid a solid foundation for the structural reliability analysis.

关 键 词：系统可靠度 失效模式 荷载增量法 约界参数 

分 类 号：TU311.2[建筑科学—结构工程]