摘要
基于弹性层状体系理论,借助大型有限元软件ABAQUS建立了新型半刚性路面结构三维有限元模型,引入铺面材料动态模量参数,并编写了UTRACLOAD和DLOAD用户子程序,研究不同车速以及连续变速下的路面结构动力响应,与基于静态参数的路面结构力学响应进行了对比;并分析了特定车速下新型半刚性路面结构与传统路面结构各力学性能指标的差异。结果表明:车速对路面结构各动力响应值的影响较小;车辆在连续变速时,路面结构上中面层受到了更为不利的剪应力作用;相比于静态模量,采用动态模量分析的半刚性基层层底拉应变减小,而沥青混凝土上面层剪应力水平增加;新型半刚性路面结构能有效降低交叉口路段车辙情况发生的几率,提高其抗永久变形能力。
In order to study the dynamic response of the new type of semi-rigid asphalt pavement structure under different speed and continuous variable speed of vehicle, the 3D finite element model is built by ABAQUS based on the elastic layered system theory, the dynamic modulus parameters of pave- ment materials are utilized, and the subroutine UTRACLOAD and DSLOAD are compiled. In addition, mechanical responses of pavement structure calculated by static parameters are compared. And difference of mechanical performance indexes between new semi-rigid and the traditional pavement structure are also analysed. The results show that the vehicle speed has few effects on dynamic responses of pavement struc- ture. Compared to the calculations by static modulus, strain of semi-rigid base layer is reduced and shear stress of asphalt surface course is increased when dynamic modulus is used. Furthermore, the new type of semi-rigid pavement structure can effectively reduce the rutting probability of intersections and improve its resistance to permanent deformation.
出处
《公路》
北大核心
2013年第6期15-20,共6页
Highway
关键词
环氧沥青
动态模量
新型半刚性路面
力学分析
车速
epoxy asphalt
dynamic modulus
new type of semi-rigid asphalt pavement
mechanicalanalysis
vehicle speed
