作　　者： ; ; ;

机构地区： 湖南大学土木工程学院

出　　处： 《铁道学报》 2003年第5期81-87,共7页

摘　　要： 考虑了3个不同的剪滞纵向位移差函数以反映薄壁箱梁不同宽度翼板的剪滞变化幅度,提出了一种能对工程中常用的变高度梯形截面箱梁剪力滞及剪切变形效应进行分析的方法。应用能量变分原理,导出了箱梁受横向荷载作用下的剪滞控制微分方程和边界条件,获得相应的闭合解。在理论解的基础上,进而建立一种考虑剪滞剪切效应的有限段模型。进行了有机玻璃模型试验,并对模型桥作了有限段法和有限元法的数值计算,计算值与试验结果均吻合良好。 Considering three longitudinal displacement differential functions, a simple and efficient method to analyze the shear lag and shear deformation effects, of the trapezoidal section box girder with varying depths is proposed.The governing differential equations and boundary conditions of the box girder under lateral loading are derived according to the energyvariational principle. The closedform solutions of the equations are obtained. Based on the theoretical solutions, a finite segment method is further developed to calculate the shear lag and shear deformation effects of the box girders with varying depths. In addition,the perspex model bridge tests and numerical model calculation by the finite segment and finite element methods are made. The results of the model tests and numerical calculation are well matched in this paper.

关 键 词： 变高度箱梁 剪力滞效应 能量变分原理 有限段法 模型试验

领　　域： [建筑科学] [交通运输工程]