倒装路面结构面层在移动荷载作用下的层底拉应力分析

Bottom Tensile Stress of Inverse Structure Pavement under Moving Load

利用ANSYS建立倒装路面结构在移动荷载作用下的有限元模型,研究超载对于倒装路面结构沥青面层疲劳寿命的影响。结果表明,在车辆荷载作用下,倒装结构沥青面层层底拉应力比半刚性路面大,在移动行车荷载作用下可达到0.17MPa;沥青面层层底拉应力随行车速度增加有小幅增加,增加幅度在15%以内;随荷载水平增加,倒装路面结构沥青面层层底拉应力呈线性增加,在超载100%时,沥青层层底拉应力为标准轴载情况下的1.7倍。

It uses ANSYS to establish the finite element model of inverse structure under moving load to study the effect of over loading on the fatigue life of inverse structure asphalt pavement. The results show that the stress of inverse structure asphalt pavement under moving load which is 0.17MPa, lager than that of half-rigid pavement; the bottom tensile stress of asphalt pavement gets a slight increase with the increase of velocity but no more than 15%; with the increase of load, the bottom tensile stress of the inverse structure asphalt pavement gets a linear increase; and in the case of 100% over loading, the tensile stress is 1.7 times of that in the case of stan- dardized axle load.