动荷载下路桥过渡段双线路基动力响应特性  

Dynamic response properties of two-way subgrade in bridge-subgrade transition section under moving load

作　　者：刘升传[1,2] 吴立坚[1] 宋二祥[2] 

机构地区：[1]交通运输部公路科学研究院,北京100088 [2]清华大学土木水利学院,北京100084

出　　处：《交通运输工程学报》2009年第6期26-31,共6页Journal of Traffic and Transportation Engineering

基　　金：铁道部科技研究开发计划项目(2007G046)

摘　　要：采用有限元方法,建立了重载铁路路桥过渡段双线路基整体三维模型,分析了动荷载作用下双线路基动力响应规律。研究发现:相向移动荷载作用下路基横向上各点的位移曲线呈"W"形状,路基左右两侧荷载作用面积中心下的位移最大;路基左侧最大位移要大于右侧最大位移,点离荷载中心越近,该点位移波动变化越剧烈。结果表明:荷载除对其作用一侧的路基位移有影响外,又加剧了路基另一侧位移;沿深度方向,荷载对路基位移的影响逐渐减弱。A 3D finite-element model was established by using finite element method to systematically study the dynamic response characteristics of subgrade in bridge-subgrade transition section of heavy haul railway under dynamic load. The response rules were summarized after analysis. It is pointed that the displacement curves of the points in horizontal direction of subgrade are assumed W shape under moving towards load. The displacement of the point at the center of loading area is largest, and the maximum displacement on the left of subgrade is larger than that on the right. More close to the loading center, the displacement change of the point is more dramatic. The result indicates that the load not only has impact on the displacements of the points on its action side, but also exacerbates the ones on the other side. Along the depth direction, the impact of load on subgrade displacement wears off. 3 tabs, 16 figs, 11 refs.

关 键 词：重载铁路 路桥过渡段 路基 动力响应 三维有限元方法 

分 类 号：U213.1[交通运输工程—道路与铁道工程]