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本文针对正交异性钢桥面板,建立了焊接构造细节有限元模型,并对热点应力进行了有限元分析。计算结果表明,国际焊接学会IIW推荐的线性外推法所得热点应力最大;各船级社推荐的方法次之;直接取距离热点0.5倍厚度处的应力作为热点应力结果最小。同时设计了相应的典型焊接构造细节,并进行了疲劳试验研究。研究结果表明,利用有限元方法得到的热点应力所预测的疲劳寿命点,处于母材的疲劳抗力方程附近;两个试件发生疲劳破坏的位置都是面板与纵肋交汇处焊缝构造处,且破坏均发生在面板母材上,两者之间吻合良好。
In this paper, the finite element model of welded structure is established for the orthotropic steel bridge deck, and the hot spot stress is analyzed by finite element method. The calculation results show that the thermal stress of the IIW recommended by the International Welding Society is the largest, the second one is the second one, and the second one is the thermal stress of the hot spot. At the same time, the corresponding typical welding structure is designed, and the fatigue test is carried out. The results show that the fatigue life predicted by the hot spot stress obtained by the finite element method is near the fatigue resistance equation of the base metal. The locations of the fatigue failure of the two specimens are all the weld structures at the intersection of the panel and the longitudinal rib, And the damage occurred in the panel base material, good agreement between the two.