正交异性夹层钢桥面板力学性能分析与截面优化

Mechanical Behaviors and Section Optimization of Orthotropic Sandwich Bridge Decks

夹层板系统(Sandwich Plate System,SPS)是由上、下2层钢板和中间1层聚氨酯弹性体芯层形成的一种复合结构,可应用于正交异性钢桥面板以优化桥面结构力学性能。为探究正交异性夹层钢桥面板的力学性能特点,并提出夹层板构造的合理化建议,针对正交异性夹层钢桥面板开展了有限元模拟与参数化分析。结果表明:正交异性夹层钢桥面板在车轮荷载作用下的位移、应力等性能指标均优于传统正交异性钢桥面板;正交异性夹层钢桥面板的芯层厚度合理取值为40~80 mm;夹层板上层钢板厚度宜大于下层钢板,且下层钢板厚度不宜太薄;通过减少纵肋数量、增大纵肋间距可在不增大应力水平的条件下减少焊缝数量。SPS夹层钢桥面板具有良好的力学性能,可在实际工程中开展应用。

Sandwich Plate System(SPS)is composed of two steel plates and a solid polymer(polyurethane)core in between.It can be applied to the orthotropic steel deck(OSD)of bridge structures to optimize the mechanical performance.In this paper,the mechanical properties of orthotropic SPS bridge decks are studied by carrying out finite element simulation and parametric analysis,based on which some design suggestions are provided.Results show that the performances regarding to displacements and stresses of the orthotropic SPS bridge deck under wheel loads are better than those of conventional OSD.The rational core thickness of orthotropic SPS bridge deck ranges from 40 mm to 80 mm.The thickness of the upper plate should be greater than the lower plate,and the thickness of lower plate should not be too thin.By decreasing the number and increasing the spacing of longitudinal ribs,the number of welds can be reduced without raising the stress level.In general,SPS bridge decks have good mechanical performance and can be used in real projects.