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首页> 外文期刊>KSCE journal of civil engineering >Analysis for Stress Characteristics and Structural Parameters Optimization in Orthotropic Steel Box Girders based on Fatigue Performance
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Analysis for Stress Characteristics and Structural Parameters Optimization in Orthotropic Steel Box Girders based on Fatigue Performance

机译：基于疲劳性能的正交异性钢箱梁受力特性及结构参数优化分析

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摘要

A fatigue design method for the orthotropic steel deck bridges is proposed. The stress characteristics of welded details are analyzed using the finite element method. Based on the fatigue performance, the structural parameters of the orthotropic steel decks (OSDs) are optimized using the combination BP (back propagation) neural network and genetic algorithms (GA). The calculated results demonstrate that the weld stresses at the deck plate-to-rib, deck plate-to-rib-to-diaphragm welded details are mainly bending stress while those at the rib-to-rib welded details are mainly membrane stress. The fatigue stress of each weld is deeply affected by the transverse and longitudinal direction positions. The local effect of stress distribution of all welded details is remarkable. The calculated results obtained using the proposed model are in good agreement with those obtained using ANSYS and the errors are within 5%. The optimal structural results are highly influenced by the applied wheel loadings, while the optimal results for the deck thickness and the U-rib opening size are highly influenced by temperature. Especially on the ordinary lane, temperature has a great effect on the fatigue performance for all welded details.
机译：提出了正交异性钢桥面的疲劳设计方法。使用有限元方法分析了焊接细节的应力特性。基于疲劳性能，使用BP（反向传播）神经网络和遗传算法（GA）相结合来优化正交异性钢甲板（OSD）的结构参数。计算结果表明，甲板到肋，甲板到肋至膜片焊接处的焊接应力主要是弯曲应力，而肋到肋的焊接处的焊接应力主要是膜应力。每个焊缝的疲劳应力都会受到横向和纵向位置的严重影响。所有焊接零件的应力分布的局部效应是显着的。使用所提出的模型获得的计算结果与使用ANSYS获得的结果吻合良好，误差在5％以内。最佳的结构结果在很大程度上受到所施加的车轮载荷的影响，而甲板厚度和U型肋开口尺寸的最佳结果则受温度的影响很大。特别是在普通车道上，温度对所有焊接细节的疲劳性能都有很大影响。

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