正交异性钢桥面板顶板与纵肋疲劳性能研究  

Research on Fatigue Properties of Top Slab and Longitudinal Rib of the Orthotropic Steel Bridge Deck

作　　者：吴伟胜[1] 曹志[2] 柴瑞 闰禹 张梁[1] 

机构地区：[1]中交公路规划设计院有限公司,北京市100088 [2]西南交通大学,成都市610031 [3]港珠澳大桥管理局,广州市519015

出　　处：《公路》2014年第10期12-16,共5页Highway

基　　金：国家科技支撑计划;项目编号2011BAG07B03

摘　　要：结构体系和受力特性共同决定了,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。正交异性钢桥面板顶板与纵肋连接焊缝直接受轮载作用,其疲劳病害尤为严重。以典型正交异性钢桥面板港珠澳大桥为研究对象,建立三维实体参数化有限元模型,以该焊接部位潜在裂纹萌生处3个关键点的应力水平及应力集中系数作为评价其疲劳性能的标准,通过改变重要设计参数,对各设计参数进行敏感性分析。研究结果表明,当顶板厚度为16mm^20mm、U肋厚度为8mm^10mm、U肋高度为280mm^300mm、熔透率为80%以上时,顶板与U肋连接焊缝抗疲劳性能较优。Abstract. Fatigue is one of the most important issues for steel orthotropic bridge deck because of the complexity of structure and corresponding mechanical characteristics. Fatigue issue is especially serious since the deck-to-longitudinal rib weld of steel orthotropic bridge deck is directly affected by wheel loads. The steel orthotropic bridge deck of the Hong Kong-Zhuhai-Macao Bridge is taken as study subject, and 3D solid parameterization finite element model is established to conduct sensitivity analysis for design parameters by changing the range of design parameters. Stress levels and stress concentration factor of three critical points at the potential sites for crack initiation of the deck-to- longitudinal rib weld are as the evaluation criteria to assess the fatigue properties. The results indicate that its fatigue properties is better when deck thickness ranges from 16mm to 20ram, longitudinal rib thickness ranges from 8mm to 10mm, longitudinal rib height ranges from 280mm to 300mm, and penetration rate ranges from 80% to 100%.

关 键 词：正交异性桥面板 顶板与纵肋焊缝 疲劳性能 应力集中系数 熔透率 

分 类 号：U443.32[建筑科学—桥梁与隧道工程]