钢桥面铺装层结构设计指标近似计算新方法

在行车荷载作用下,钢桥面铺装层的受力与变形较一般公路沥青路面或机场道面复杂得多,也是钢桥面铺装层结构设计的一个重要因素。从使用条件、工程实践、试验研究和受力特点等角度出发,提出钢桥面铺装层结构设计指标:一是铺装层拉应力,二是铺装层表面局部挠跨比。采用有限元方法建立在车载作用下钢桥面铺装层的力学响应计算模型。在结构设计参数常用取值范围内,对不设纵隔板和设置纵隔板两种常用钢桥面铺装层的结构设计指标关键影响因素进行正交敏感性分析。同时,通过逐步线性回归方法拟合出钢桥面铺装层结构设计指标的近似计算公式。得到的近似计算公式的精度检验和工程实例分析结果表明,近似计算公式精度很好,满足工程设计和理论研究的需要。研究结果可为钢桥面铺装层结构设计提供近似计算的新方法。

An approximate method for calculation of design indices of steel bridges deck surfacing

The mechanics and deformation of deck surfacing of steel bridges are,due to wheel loading,more complicated than asphalts for road and airport.Design indices are proposed for the steel bridge deck surfacing,in terms of work condition,application,experimental research and mechanical characteristics.A computer model for the mechanical response of steel bridge deck surfacing under wheel loading is established by using the finite element method.Within regular range of structural design parameters,the key factors of design indices are studied through orthogonal analysis of steel bridge deck surfacing with or without longitudinal clapboard.Approximation formulas of design indices for steel bridge deck surfacing are obtained by using linear regression analysis.A number of tests indicate that the formulas are accurate,making them suitable for engineering and theoretical applications.