This paper investigates the fatigue property of U rib-crossbeam-deck connections in orthotropic steel bridge decks (OBD) under combined loading of bending and torsion by using the improved traction structural stress method. Applicability of the method for analyzing OBD under combined loads is validated by comparing the simulation results with the experimental results from the literature. The fatigue property of OBD in multiaxial stress states is studied by investigating the effects of the ratio of specimen width to length and combined loading amplitude. The trend and amplitude of the improved traction structural stress distribution change with an increase in the ratio of width to length.

利用改进的牵引结构应力方法，研究正交各向异性钢桥面板（OBD）中U肋-横梁-桥面连接的疲劳特性。通过将仿真结果与文献中的实验结果进行比较，验证了组合载荷下OBD分析方法的适用性。通过研究试样宽度与长度之比和组合载荷振幅的影响，研究了OBD在多轴应力状态下的疲劳特性。牵引结构应力分布改善的趋势和幅度随宽度与长度之比的增加而变化。