移动荷载作用下近桥台处路面结构动力响应的有限元法分析  

FEM Analysis of Dynamic Response of Pavement Adjacent to Abutment under Moving Load

作　　者：刘萌成[1] 黄晓明[1] 陶向华[1] 

机构地区：[1]东南大学交通学院,江苏南京210096

出　　处：《公路交通科技》2006年第5期1-6,共6页Journal of Highway and Transportation Research and Development

基　　金：交通部西部交通建设科技项目资助(200231800032)

摘　　要：应用ABAQUS有限元建立了桥台后路堤路面动力计算的三维模型,将车辆荷载表达为反复移动的分布荷载(移动荷载)形式,并编制了VDLOAD子程序。通过有限元Explicit计算模块,首先分析了行车速度、材料阻尼比与轮胎压力对路面结构动响应的影响;其次,着重分析了车速90km/h、阻尼比5%、胎压700kPa条件下单次与多次循环荷载作用下路面动应力与位移的变化规律。分析认为,随着开放交通后道路使用时间的增长,路桥过渡段差异沉降的累积将导致近桥台处路面结构损坏程度加剧,从而影响道路的正常使用。A three-dimension FEM model is presented which is applied to investigate the dynamic response the pavement adjacent to the abutment under the truffle loading. The vehicle load is simplified to be a periodically moving load and has been implemented into ABAQUS code as a user subroutine VDLOAD.Firstly, the influences of the velocity, damping ratio and fire pressure on the response of pavement are analyzed by using ABAQUS explicit code; secondly, the dynamic stress and displacement of pavement under one or more cycles are closely studied under usual conditions. It is concluded that the accumulation of the approach settlement lead to damage or even broken of the pavement under traffic loading.

关 键 词：桥台 路面结构 移动荷载 有限元 影响因素 

分 类 号：U416.2[交通运输工程—道路与铁道工程]