钢桥面板顶板与纵肋连接细节轮载受力特征及疲劳性能提升

Wheel load stress characteristics and fatigue performance improvement of rib-to-deck details for orthotropic steel deck

采用有限元方法分析了纵肋与顶板连接处3个疲劳易损细节的轮载应力响应特征,并研究了钢-UHPC组合桥面体系和顶板厚度对钢桥面板疲劳性能的影响。结果表明,纵肋与顶板连接各细节在车轮荷载作用下的局部效应显著,纵向影响区域均位于两道横隔板之间;采用钢-UHPC组合桥面体系可以减小局部变形,使各疲劳易损细节的轮载应力峰值和等效应力幅降低90%以上;建议设计中适当提高钢桥面板顶板厚度,以减少或防止顶板纵向疲劳裂纹的产生。

The wheel load stress response characteristics of three vulnerable details at rib-to-deck connection were analyzed by the finite element method,the effect of steel UHPC composite bridge deck system and roof thickness were also studied.The results showed that the local effect of rib-to-deck connection under the wheel load is significant,and the longitudinal influence area is located between the two diaphragms.The steel-UHPC composite bridge deck system can reduce the local deformation and reduce the wheel load stress peak and equivalent stress amplitude of each fatigue vulnerable detail by more than 90%.It is suggested that the thickness of the top plate of steel bridge deck should be properly increased in the design to reduce or prevent the occurrence of longitudinal fatigue cracks on the top plate.