铆接钢桥的系统疲劳可靠度评估  

System Fatigue Reliability Assessment of Riveted Steel Bridges

作　　者：王春生[1] 陈惟珍[2] 陈艾荣[2] 

机构地区：[1]长安大学桥梁与隧道陕西省重点实验室,陕西西安710064 [2]同济大学桥梁工程系,上海200092

出　　处：《中国公路学报》2008年第5期45-49,共5页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(50408028);高等学校全国优秀博士学位论文作者资助项目

摘　　要：针对铆接钢桥的疲劳失效特点,在建立铆接钢桥构件整体断裂力学数值分析模型的基础上,提出铆接钢桥构件、结构系统疲劳断裂可靠性分析模型。基于Monte Carlo算法,编制用于铆接钢桥系统疲劳可靠性分析的大型程序。将铆接钢桥系统疲劳可靠性分析模型应用于浙江路桥的系统疲劳可靠度评估,概率剩余寿命评估结果表明:若按保证桥梁的正常使用功能,超声波探测间隔为1.5年,该值要比按构件简化断裂力学分析模型计算的系统探测间隔(4年)短,可见铆接构造、钉载等对概率疲劳寿命的影响是显著的。According to the fatigue failure mechanism of riveted steel bridges, a double-angle probabilistic fracture failure model （DAPFFM） of riveted bridge members and a system fatigue reliability model were proposed based on the whole riveted member fracture mechanics models. Furthermore, a large systems fatigue reliability analysis program was developed based on Monte Carlo algorithm. Then the member and structure system fatigue reliability model of riveted bridge was used to predicate the system fatigue reliability of Zhejiang Road Bridge based on Monte Carlo algorithm. According to the probabilistic remaining fatigue life assessment results, the inspection interval for assuring the normal service function of main truss system is 1. 5 years, which is shorter than system evaluation results （4 years） using simple fracture mechanics models. The fatigue reliability evaluation results indicate that the influence of the riveted configuration and pin loads on probabilistic fatigue life is remarkable.

关 键 词：桥梁工程 铆接钢桥 概率断裂力学 系统疲劳可靠度 MONTE Carlo算法 

分 类 号：U447[建筑科学—桥梁与隧道工程]