在役钢结构吊车梁疲劳可靠性分析  

Fatigue reliability analysis of a steel crane beam in service

作　　者：杨佑发[1] 陈前 雷鸣 YANG Youfa;CHEN Qian;LEI Ming(College of Civil Engineering,Chongqing University,Chongqing 400045,China;Changsha Planning and Design Institute Co.,Ltd.Changsha 410030,China)

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]长沙市规划设计院有限责任公司,长沙410030

出　　处：《振动与冲击》2020年第9期165-172,193,共9页Journal of Vibration and Shock

基　　金：重庆市建设科技计划项目(2016-07)。

摘　　要：基于结构可靠性理论,针对钢吊车梁的应力幅是否服从威布尔分布进行了计算验证,并对分布参数进行了讨论。对我国钢结构设计规范中的S-N曲线进行了考虑降低低应力幅的疲劳效应的双斜率形式的修正,并利用修正前后的S-N曲线的计算结果进行了分析。采用动态疲劳可靠度模型分析了表面粗糙度、残余应力、吊车竖向荷载偏心及温度对钢吊车梁的疲劳可靠度的影响规律;并提出了对钢吊车梁设计、使用和维护的参考意见。Based on the theory of structural reliability,the whole use process of a steel crane beam was considered as a random process.The effect and resistance of the steel crane beam were considered as random variables,and the fatigue dynamic reliability calculation model for the limit stress was studied.The fatigue reliability factors of the steel crane girder were analyzed by using the fatigue dynamic reliability calculation model.Based on the study,the suggestions for fatigue design,operation and maintenance of steel crane beams were put forward.

关 键 词：钢结构吊车梁 疲劳 可靠度 应力幅 S-N曲线 

分 类 号：TU375.3[建筑科学—结构工程]