铁路钢桥疲劳损伤概率分析  

Analysis of Fatigue Damage Probability for Steel Railway Bridges

作　　者：李亚东[1] 徐俊[1] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031

出　　处：《桥梁建设》2003年第4期1-3,10,共4页Bridge Construction

摘　　要：首先介绍了钢桥疲劳剩余寿命评估的常规方法及其缺陷,这种缺陷可以由可靠度方法弥补。随后推导出在材料疲劳曲线已知、疲劳曲线的概率分布已知以及给定疲劳曲线可靠度等3种可能条件下相应的计算结构疲劳损伤度概率的公式。最后结合实例,将概率方法与常规方法的评估结果进行了比较。The common method for evaluating the remaining fatigue life of steel bridges and limitations of the method are presented. The limitations of the method, however, can be improved by the reliabilitybased method. The corresponding expressions for calculating the structure fatigue damage probability are derived under three kinds of possible conditions that the material fatigue curves, the probability distribution of fatigue curves and the reliability of fatigue curves are given. Finally, the evaluation results yielding from both the common method and probability method are compared through a case study.

关 键 词：钢桥 损伤 疲劳 评估 可靠度 概率分布 

分 类 号：U441.4[建筑科学—桥梁与隧道工程]