结合正交异性钢桥面板的足尺模型试验和有限元数字分析方法,研究和探讨正交异性钢桥面板的疲劳强度和疲劳裂纹。通过静载和动载试验,研究纵向U肋与横梁接缝的应力特点和疲劳裂纹特性。用应变能密度因子方法分析疲劳裂纹的扩展,研究在裂纹尖端设止裂孔的裂纹维修方法的有效性。 Combined with the full-scale model test and finite element numerical analysis method of orthotropic steel bridge deck, the fatigue strength and fatigue crack of orthotropic steel bridge deck are studied and discussed. Through the static and dynamic load tests, the stress characteristics and fatigue crack characteristics of the joint between the longitudinal U-rib and the crossbeam are studied. The strain energy density factor method is used to analyze the expansion of fatigue crack, and the effectiveness of the crack repair method for crack arrest holes at crack tip is studied.