移动荷载作用下沥青路面三向应变动力响应模拟分析  

Analysis of the dynamic response of three directional strains in asphalt pavement under moving vehicle loads

作　　者：董泽蛟[1] 曹丽萍[1] 谭忆秋[1] 吴思刚[1] 

机构地区：[1]哈尔滨工业大学,黑龙江哈尔滨150090

出　　处：《土木工程学报》2009年第4期133-139,共7页China Civil Engineering Journal

基　　金："十一五"国家科技支撑计划重点项目(2006BAJ18B05);高等学校博士学科点专项科研基金(20060213002);哈尔滨工业大学优秀青年教师培养计划(HITQNJS.2007.032)

摘　　要：研究沥青路面在车辆移动荷载作用下的动态应变响应是掌握路面结构行为的前提条件。首先,基于应变实测现场情况,建立移动荷载作用下,三维沥青路面瞬态动力分析有限元模型,并给出了路面有限元分析的动力学原理、荷载条件、边界条件和材料参数;而后分析不同车速、横向作用位置、行驶状态等荷载条件下的沥青路面竖向、横向以及纵向应变响应的空间分布和时程变化规律。结果表明,移动荷载作用下,路面结构的应变响应具有明显的波动性质;沥青层内部应变在荷载作用前后发生拉压应变交替变化;车辆荷载的速度、横向作用位置以及幅值都影响路面结构的应变响应,需要在应变实测中严格控制;车辆行驶状态改变了路面结构的动力响应,路面结构受力状态趋于不利。The dynamic response of asphalt pavement subjected to the moving wheel loads is one of the primary aspects for understanding the structure behavior of pavement. A three-dimensional finite element model in transient dynamic mode is developed to obtain the dynamic response of three directional strains due to the moving load, based on site conditions of strain measurements. The pavement dynamic theory, moving load, boundary condition and structural parameters for the FEM analysis are briefly introduced. The time histories and distributions of three directional strains under the different loading conditions are analyzed to identity their effects on the dynamic response. The results show that the dynamic response of strains in pavement structure subjected to moving load exhibits wave characteristics, and alternation between positive and negative strains occurs during the passage of the loading. In addition, it should be noted that the moving speeds, transverse loading points, loading magnitudes and traveling states are found to be significant and should be paid more attention in the in situ measurement of three directional strains.

关 键 词：道路工程 三向应变 有限元模拟 沥青路面 移动荷载 

分 类 号：U416.217[交通运输工程—道路与铁道工程]