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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钢箱梁应力特性和结构参数优化分析

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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：提出了一种疲劳钢甲板桥的设计方法。使用有限元法分析焊接细节的应力特性。基于疲劳性能，使用组合BP（反向传播）神经网络和遗传算法（GA）优化正交钢甲板（OSDS）的结构参数。计算结果表明，甲板板到肋的焊接应力，甲板板到肋圈到隔膜焊接细节主要是弯曲应力，而肋状焊接细节的那些主要是膜应力。每个焊缝的疲劳应力深受横向和纵向方向的影响。所有焊接细节的应力分布的局部效果显着。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，并且误差在5％范围内。最佳结构结果受施加的车轮载荷的高度影响，而甲板厚度和U形肋开口尺寸的最佳结果受到温度的高度影响。特别是在普通车道上，温度对所有焊接细节的疲劳性能产生了很大的影响。

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