Study on Detail Fatigue Reliability of Composite Beams under Vehicle Bridge Coupling Vibration

桥梁的疲劳破坏作为一种不易发现的破坏形式，发生后易造成较为严重的人员伤亡以及财产损失。可靠度分析方法作为一种科学的疲劳事故预防手段，可以有效地为桥梁的维护以及修缮工作提供理论指导。本文采用车桥耦合振动分系体系，计算车辆荷载作用下桥梁细节产生的应力响应，针对交通量增长、路面不平整度等级以及初始路面平整度指数影响下的桥梁可靠度指标变化规律进行研究。 Fatigue failure of bridges, as a form of failure that is difficult to detect, can easily cause serious casualties and property damage when it occurs. The fatigue reliability analysis method, as a scientific means of preventing fatigue accidents, can effectively provide theoretical guidance for the maintenance and repair of bridges. This article uses a vehicle bridge coupled vibration system to calculate the stress response of bridge details under vehicle loads, and studies the variation of bridge reliability indicators under the influence of traffic volume growth, road roughness level, and initial road roughness index.