中文摘要：

基于疲劳累积损伤和断裂力学理论，建立了能表征铆接钢桥疲劳破坏行为的确定性评估方法．进而基于铆接钢桥的疲劳随机损伤演化机理，针对铆接结构多破坏模式和铆接多成分、多构件的疲劳失效特点，建立了能反映铆接钢桥脆断和韧断疲劳破坏机制的构件概率疲劳模型和系统疲劳可靠性分析模型．基于Monte-Carlo算法，进行铆接钢桥构件和结构系统疲劳断裂失效概率的计算，并编制了用于铆接钢桥系统疲劳可靠性分析的大型程序系统．

英文摘要：

Based on linear fatigue-damage accumulation theory and fracture mechanics, the deterministic assessment approach was proposed, in which the fatigue failure behavior of riveted steel bridges was reflected. According to the stochastic fatigue failure mechanism of riveted steel bridges, two probabilistic fatigue failure models-brittle and ductile were established. Moreover. a double-angle probabilistic fatigue failure model （DAPFFM） for riveted members and a system fatigue reliability assessment model for riveted truss bridges were proposed, in which the effects of the fatigue failure mechanism, multi-failure models, riveted multi-elements, riveted build-up multi-members of riveted steel bridges, etc. were included, Furthermore, based on Monte-Carlo method, a large system fatigue reliability analysis program was developed to calculate members and system fatigue failure probability of riveted steel bridges.