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既有铁路钢桥承受着日益繁重的交通荷载,其使用安全倍受关注。针对铆接结构多破坏模式和铆接多成份、多构件的疲劳失效特点,在建立铆接构件双角钢概率疲劳破坏模型的基础上,提出铆接钢桥系统疲劳可靠性分析模型。基于M on te C arlo算法,建立计算系统疲劳失效概率的基本流程,编制用于铆接钢桥系统疲劳可靠性分析的大型程序RBSPFF。将铆接钢桥系统疲劳可靠性分析模型应用于京九线赣江桥的疲劳可靠度评估。由赣江桥概率剩余寿命评估结果可知,若按保证桥梁的正常使用功能,上、下游铁路桥面系的超声波探测间隔分别为1.7 a和0.6 a;若按保证主桁结构系统承载安全,则探测间隔为3.7 a。
The existing railway steel bridge is subject to the increasingly heavy traffic load, the use of safety much concern. Aiming at the multi-failure modes of riveted joints and the fatigue failure characteristics of riveted multi-component and multi-component joints, the fatigue reliability analysis model of riveted steel bridge systems is proposed based on the failure probability model of double-angle steel riveted components. Based on Monte Carlo algorithm, the basic flow of calculating the probability of system fatigue failure is established and a large program RBSPFF for fatigue reliability analysis of riveted steel bridge system is developed. The fatigue reliability analysis model of riveted steel bridge system is applied to the fatigue reliability assessment of the Ganjiang Bridge on the Beijing-Kowloon Railway. According to the assessment results of probable residual life of Ganjiang Bridge, if the normal function of the bridge is guaranteed, the ultrasonic detection intervals of the bridge deck at the upper and lower reaches are 1.7 a and 0.6 a, respectively; if the safety of the main truss structure system is guaranteed, The detection interval is 3.7 a.