脉冲荷载下沥青路面粘弹性响应分析  

Analyses of viscoelastic responses of asphalt pavements under pulse loading

作　　者：赵延庆[1] 周长红[1] 王国忠[1] 王志超[1] 

机构地区：[1]大连理工大学交通运输学院,辽宁大连116024

出　　处：《大连理工大学学报》2011年第1期73-77,共5页Journal of Dalian University of Technology

基　　金：中央高校基本科研业务费专项资金资助项目

摘　　要：为客观反映沥青路面结构的行为特性,需在结构响应分析中综合考虑粘弹性和脉冲荷载等因素.为此,对沥青路面路表弯沉、沥青层底拉应变和土基顶面压应变在脉冲荷载下的粘弹性响应进行了分析.计算了典型沥青路面结构3种响应的单位响应方程,然后利用Boltzmann叠加原理分析了路面结构在半正弦脉冲荷载下的粘弹性响应,并分析了行车速度对3种粘弹性响应的影响.研究表明单位响应方程可以用Prony系列精确表达,并可用配置法确定其参数.随着车速的降低,各粘弹性响应的峰值增加,沥青层底拉应变和土基顶面压应变响应峰值增加的幅度较大.The effects of viscoelasticity and pulse loading should be taken into account in pavement response analyses in order to obtain realistic asphalt pavement behavior.So viscoelastic responses under pulse loading were investigated for surface deflection,tensile strain at the bottom of asphalt concrete（AC）layers and compressive strain at the top of subgrade.The unit response equations for the three responses were determined for a typical asphalt pavement,and Boltzmann superposition principle was then used to calculate the viscoelastic responses under haversine pulse loading.The effects of vehicle speed on the three types of pavement responses were also evaluated.It is shown that the unit response equations can be accurately represented using Prony series,and the coefficients can be determined by collocation method.The peak values of the viscoelastic responses increase with decreasing of vehicle speed and larger increases in peak values are obtained for tensile strain at the bottom of AC layers and compressive strain at the top of subgrade.

关 键 词：粘弹性 脉冲荷载 单位响应方程 配置法 Boltzmann叠加原理 

分 类 号：U416.217[交通运输工程—道路与铁道工程]