基于PDEM的正交异性钢桥面板焊接节点时变疲劳可靠度评估

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (18) : 87-95.

论文

基于PDEM的正交异性钢桥面板焊接节点时变疲劳可靠度评估

郝静1，卢海林1,2，陈龙3

作者信息 +

Time-dependent fatigue reliability assessment for welded joints of orthotropic steel bridge decks based on the probability density evolution method

HAO Jing1，LU Hailin1,2，CHEN Long3

Author information +

文章历史 +

摘要

提出了基于概率密度演化方法的正交异性钢桥面板焊接节点时变疲劳可靠度评估方法，并以润扬大桥顶板-U肋焊接节点为对象开展应用研究。首先，基于S-N曲线和Miner准则，构建了可同时考虑疲劳性能退化和荷载效应增长的钢桥面板焊接节点疲劳极限状态函数，并导出其概率密度演化方程。然后，采用有限差分法求解该方程，据此得到概率密度演化曲面，进而建立其时变疲劳可靠度评估方法。最后，通过工程实例验证了所提方法的可行性和准确性，并探讨了疲劳性能退化和荷载效应增长对该节点时变疲劳可靠度的影响规律。研究表明：与Monte Carlo法相比，本方法不仅精确高效，还能捕捉概率密度演化信息；疲劳性能退化和荷载效应增长会显著影响钢桥面板焊接节点的疲劳寿命。

Abstract

A time-dependent fatigue reliability assessment method based on probability density evolution method was proposed for the orthotropic steel deck with welded joints, and the application was presented with the examples of a welded rib-to-deck joint for Runyang Bridge. Firstly, based on the S-N curve and Miner’s rule, the fatigue limit state function of the welded joints in steel deck with consideration of the degradation of the fatigue behavior and growth of loading effects was established, and the probability density evolution equation of that was derived. Then, this equation was solved by the finite difference method to obtain the corresponding probability density evolution surface, and then a time-dependent fatigue reliability assessment method for that was established. Finally, the feasibility and accuracy of the proposed method was verified through an engineering example, and the influences of degradation of the fatigue behavior and growth of loading effects on time-dependent fatigue reliability of the welded joints were discussed. The results reveal that the proposed method possesses of preferable computational precision, efficiency, and can capture the probability density evolution information by comparison with Monte Carlo method. Degradation of the fatigue behavior and growth of loading effects significantly affect the fatigue life of the welded joints in orthotropic steel deck.

导出引用

郝静1, 卢海林1, 2, 陈龙3. 基于PDEM的正交异性钢桥面板焊接节点时变疲劳可靠度评估[J]. 振动与冲击, 2024, 43(18): 87-95

HAO Jing1, LU Hailin1, 2, CHEN Long3. Time-dependent fatigue reliability assessment for welded joints of orthotropic steel bridge decks based on the probability density evolution method[J]. Journal of Vibration and Shock, 2024, 43(18): 87-95

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