正交异性钢桥面板闭口加劲肋对接焊缝疲劳性能评价

Fatigue Assessment Method of the Close Ribs Butt Weld of the Orthotropic Steel Deck

摘要:

根据等效应力幅的概念，采用国内2座大桥近半年的交通数据对闭口加劲肋的疲劳性能进行评价.闭口加劲肋对接焊缝处应力影响线较短，通过车型的调查可以将车辆荷载转化为轴型荷载加载应力影响线，从而避免数值模拟实际车流.通过与我国钢桥规范推荐评价方法对比可以看出，采用统计的轴型荷载计算得到的等效应力幅小于规范评价方法得到的计算结果.并对我国钢桥规范中的损伤等效系数的取值进行了讨论.

关键词:正交异性钢桥面板; 对接焊缝; 等效应力幅; 损伤等效系数

Abstract:

Based on the theory of the equivalent stress range, almost half a year traffic data of two bridges were adopted to assess the fatigue behavior of the butt weld of the close rib. Due to the length of the stress influence line of the butt weld was relatively short, the axle loads were used to pass the influence line instead of the vehicle loads. The equivalent stress range was obtained and then compared with the result of the method in China specification. It showed that the equivalent stress range obtained from the practice axle loads is less than the value in China specification, at last the values of damage equivalent factors are discussed.

Key words:the orthotropic steel deck; butt weld; equivalent stress range; damage equivalence factor