滨海重载钢桥的焊缝腐蚀疲劳可靠度评估

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振动与冲击 ›› 2025, Vol. 44 ›› Issue (5) : 140-148.

土木工程

滨海重载钢桥的焊缝腐蚀疲劳可靠度评估

朱金1，陈远文1，吴梦雪2，张宇3，衡俊霖*4，李永乐1

作者信息 +

Reliability assessment of weld corrosion fatigue of coastal heavy duty steel bridge

ZHU Jin1, CHEN Yuanwen1, WU Mengxue2, ZHANG Yu3, HENG Junlin*4, LI Yongle1

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摘要

为研究钢桥焊缝在强腐蚀环境和重载下的疲劳问题，首先，基于前期实验成果，构建了一个三阶段的腐蚀疲劳概率损伤演化模型，分为腐蚀驱动扩展、腐蚀与疲劳竞争、疲劳驱动扩展三个关键阶段。在考虑焊缝多源疲劳裂纹的萌生、融合与扩展的基础上，还纳入了多重失效路径的影响。以某滨海桥梁为工程背景，结合该桥梁的实测车辆荷载谱与服役环境特征，综合多尺度有限元模拟和腐蚀疲劳概率损伤演化模型开展了可靠度分析。结果表明：与焊趾失效模式相比，焊根失效模式的腐蚀疲劳寿命降低了11.3%，而双失效模式的寿命减少了16.3%，即焊根失效模式占主导地位；C5环境下腐蚀疲劳寿命相比C4环境条件下降低了26.9%，即环境腐蚀等级越高，腐蚀疲劳寿命越短；当车流量系数为1.2%和2.4%时，相比恒定车流量，腐蚀疲劳寿命分别减少了29.9%和38.8%，即车流量越大，腐蚀疲劳寿命越短；在高等级环境腐蚀和高车流量的双重作用下，腐蚀疲劳寿命下降了47.8%，即强环境腐蚀和重载的耦合作用下，钢桥焊缝抗疲劳性能显著退化。

Abstract

To investigate the fatigue issues of welds in steel bridges under severe corrosion environments and heavy loading, a three-stage probabilistic corrosion fatigue damage evolution model was developed based on previous experimental results. The model is divided into three key stages: corrosion-driven growth, competition between corrosion and fatigue, and fatigue-driven growth. The model also incorporates the effects of multiple failure paths, considering the initiation, coalescence, and propagation of multi-source fatigue cracks in the welds. Using a coastal bridge as the engineering background, a reliability analysis was conducted through multi-scale finite element simulations combined with the probabilistic corrosion fatigue damage evolution model, integrating the measured vehicle load spectrum and environmental characteristics of the bridge. The results indicate that, compared to the weld toe failure mode, the corrosion fatigue life of the weld root failure mode is reduced by 11.3%, and the dual failure mode life is reduced by 16.3%, with the weld root failure mode being dominant. Under a C5 environment, the corrosion fatigue life is reduced by 26.9% compared to the C4 environment, indicating that the higher the environmental corrosion grade, the shorter the corrosion fatigue life. When the traffic volume coefficients are 1.2% and 2.4%, the corrosion fatigue life decreases by 29.9% and 38.8%, respectively, compared to constant traffic conditions, indicating that the higher the traffic volume, the shorter the corrosion fatigue life. Under the combined effects of severe environmental corrosion and heavy traffic loads, the corrosion fatigue life is reduced by 47.8%, demonstrating significant degradation of the fatigue resistance of welds in steel bridges under the coupled effects of severe corrosion and heavy loads.

导出引用

朱金1, 陈远文1, 吴梦雪2, 张宇3, 衡俊霖4, 李永乐1. 滨海重载钢桥的焊缝腐蚀疲劳可靠度评估[J]. 振动与冲击, 2025, 44(5): 140-148

ZHU Jin1, CHEN Yuanwen1, WU Mengxue2, ZHANG Yu3, HENG Junlin4, LI Yongle1. Reliability assessment of weld corrosion fatigue of coastal heavy duty steel bridge[J]. Journal of Vibration and Shock, 2025, 44(5): 140-148

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