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疲劳问题是正交异性钢桥面板应用和发展所面临的重要课题。以典型的正交异性桥面板钢箱梁桥——港珠澳大桥为研究对象,通过足尺试件模型,校准了钢桥面板中横隔板挖孔分析的有限元模型。选取最易发生疲劳损伤的U肋与横隔板连接处的两个疲劳细节为研究对象,利用校准的有限元模型分析不同开孔以及各开孔纵肋和横隔板厚度等变化对该处疲劳的影响,进而为优化设计提供理论依据。分析表明:仅就应力水平而言,Eurocode推荐的铁路孔型3和文中给出的典型圆形孔型7较好;但是,综合考虑应力和加工制造等原因,孔型1即港珠澳大桥所采用的孔型占优。
The fatigue problem is an important issue facing the application and development of orthotropic steel bridge deck. Taking the typical orthotropic deck steel box girder bridge - Hong Kong-Zhuhai-Macao Bridge as the research object, the finite element model of the excavation analysis of the diaphragm in the steel bridge deck was calibrated by the full-scale specimen model. The two fatigue details of the connection between the U-rib and the diaphragm which is the most prone to fatigue damage are selected as the research object. The finite element model is used to analyze the variation of the different openings and the thickness of the vertical ribs and the diaphragm in each opening Fatigue effects, and thus provide a theoretical basis for the optimal design. The analysis shows that Eurocode’s recommended rail type 3 and the typical circular hole type 7 given in this paper are better than the stress level alone. However, considering the stress and manufacturing reasons, Pier 1 is the Hong Kong-Zhuhai-Macau Bridge The hole used by dominant.