大纵肋钢桥抗疲劳设计方法研究

Study on Fatigue Resistance Design Method of Large Longitudinal Ribbed Steel Bridge

针对目前大纵肋正交异性钢桥面板疲劳影响因素及抗疲劳性能研究较少的情况,本文基于有限元软件ANSYS,分别建立普通和大纵肋两个正交异性钢桥面板有限元模型,以3个典型疲劳细节为研究对象,基于最大主应力为评价指标,研究不同横肋板、U肋和顶板厚度的工况下两个正交异形钢桥面板的疲劳敏感性,详细对比了普通和大纵肋两个正交异性钢桥面板的疲劳特征。

In view of the fact that the fatigue influencing factors and fatigue resistance of large longitudinal rib orthotropic steel bridge decks are few,the finite element model of two orthogonal steel bridges of ordinary and large longitudinal ribs is established based on finite element software ANSYS.Taking three typical fatigue details as the research object,based on the maximum principal stress as the evaluation index,the fatigue sensitivities of two orthogonal shaped steel bridge decks under different working conditions of transverse ribs,U ribs and roof thickness were studied.Fatigue characteristics of two orthogonal steel bridge decks with large longitudinal ribs.