随机轮载下钢桥面顶板与纵肋焊缝疲劳裂纹扩展特性研究

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (1) : 193-201.

论文

鲁乃唯1,2，刘静1，王凯3，王鸿浩1

作者信息 +

Fatigue crack propagation characteristics of steel bridge deck roof-longitudinal rib weld joint under random wheel load

LU Naiwei1,2, LIU Jing1, WANG Kai3, WANG Honghao1

Author information +

文章历史 +

摘要

车辆轮迹横向分布是钢桥面板焊缝处产生随机应力谱的一项关键因素，加之焊接缺陷形态的随机性，诱发钢桥面板疲劳裂纹随机扩展行为。为了研究钢桥面顶板焊缝处疲劳裂纹的随机扩展特性，基于断裂力学理论与扩展有限元方法分析了轮迹横向分布对钢桥面板顶板焊根和焊趾等效应力强度因子的影响规律，揭示了轮迹横向分布离散度、初始裂纹深度和初始裂纹形态比对焊缝处疲劳裂纹随机扩展路径分布的影响规律。结果表明：轮载中心处于U肋正上方中心和焊缝中心位置分别为顶板焊趾和焊根的最不利横向加载工况；车辆轮迹横向分布对顶板焊根和顶板焊趾疲劳裂纹前缘应力强度因子影响差异显著，顶板焊根最大等效应力强度因子为85.99(MPa•mm1/2)，比顶板焊趾增加了6.72%；轮迹横向分布离散度和初始裂纹深度与钢桥面板焊缝处疲劳裂纹随机扩展路径分布离散程度成正相关，初始裂纹形态比与其成负相关；焊缝细节初始裂纹深度越大，车辆荷载对其横向影响范围越大；焊缝细节初始裂纹形态比越大，车辆荷载对其横向影响范围变化不明显。

Abstract

The transverse distribution of wheel tracks is a key factor to generate random stress spectrum at welded joints of orthotropic steel bridge deck. In addition, the morphology of welding defect are random in nature. Thus, the random propagation behavior of fatigue cracks in steel bridge deck was induced. In order to study the random propagation characteristics of fatigue cracks at the welded joints of steel bridge deck, the effect of wheel tracks transverse distribution on equivalent stress intensity factor of welded root and toe of orthotropic steel bridge deck were analyzed based on the fracture mechanics theory and extended finite element method. The effect of wheel tracks transverse dispersion, initial crack depth and initial crack morphology ratio on distribution of random propagation path of fatigue cracks at welded joints were revealed. The results indicate that transverse distribution of vehicle wheel tracks has a significant effect on the stress intensity factor of the fatigue cracks of the welded root and the welded toe. The maximum equivalent stress intensity factor of welded root is 85.99(MPa•mm1/2), which was 6.72% higher than that of welded toe. The dispersion degree of transverse distribution of wheel tracks and initial crack depth are positively correlated with the dispersion of random propagation path distribution of fatigue cracks of welded joints of orthotropic steel bridge deck, and the initial crack morphology ratio is negatively correlated with them.

导出引用

鲁乃唯1,2，刘静1，王凯3，王鸿浩1. 随机轮载下钢桥面顶板与纵肋焊缝疲劳裂纹扩展特性研究[J]. 振动与冲击, 2024, 43(1): 193-201

LU Naiwei1,2, LIU Jing1, WANG Kai3, WANG Honghao1. Fatigue crack propagation characteristics of steel bridge deck roof-longitudinal rib weld joint under random wheel load[J]. Journal of Vibration and Shock, 2024, 43(1): 193-201

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