Physical fatigue tests and numerical simulation were conducted to verify the effectiveness of cold reinforcement methods of distortion-induced fatigue cracks at web gaps in steel girder bridges. Test results indicate that stop-holes could temporarily arrest crack growth. However, bolting and bonding angle could effectively arrest further cracking, and reduce distortions and fatigue stresses. Numerical simulation analysis results show that the equivalent stress intensity factor decreased dramatically below the corresponding threshold after bolting or bonding reinforcement. The innovative bonding angle reinforcement strategy is more recommended for better reinforcement effectiveness, no damage to the original structure, and avoiding traffic disruption.

通过物理疲劳试验和数值模拟，验证了冷加固方法对钢梁桥腹板间隙扭曲疲劳裂纹的有效性。测试结果表明，止动孔可以暂时阻止裂纹扩展。然而，螺栓连接和粘合角度可以有效地阻止进一步的开裂，并减少扭曲和疲劳应力。数值模拟分析结果表明，在螺栓连接或粘接加固后等效应力强度因子显着降低到相应阈值以下。更推荐采用创新的粘接角加固策略，加固效果更好，不破坏原有结构，避免交通中断。