多孔混凝土基层缩缝处沥青面层应力分析

Stress's numerical analysis of asphalt surface in porous concrete base's transverse contraction joint

为了研究多孔混凝土基层沥青路面的结构设计方法,通过三维有限元数值分析方法,建立多孔混凝土基层缩缝处沥青路面的三维有限元模型,分析多孔混凝土基层缩缝处沥青面层的荷载应力、温度应力、荷载与温度耦合作用下的耦合应力。结果表明:基层缩缝处沥青面层底面荷载主应力多为压应力值,但其剪应力在接缝处出现峰值;在温度作用下,沥青面层应力峰值点的位置在基层缩缝中点处沥青面层的底面及表面;荷载和温度耦合作用下基层缩缝中点处沥青面层底面的第一主应力介于荷载应力和温度应力之间。

3D finite element model of asphalt pavement in porous concrete base＇s transverse contraction joint is established by 3D finite element numerical analysis method. Meanwhile, the load stress, temperature stress and coupling stress of asphalt surface in porous concrete base＇s transverse contraction joint are calculated and analyzed by 3D finite element method in order to study structural design method of asphalt pavement with porous concrete base. Calculating results indicate that almost all principal stresses of asphalt surface in base＇ s transverse contraction joint are compression stress, and maximum shearing stress appears. The points of the biggest temperature stress are located in the upper and the bottom of asphalt surface in the middle of porous concrete base＇ s transverse contraction joint, when temperature is applied to the pavement structure. When both load and temperature are applied to the pavement structure, the first principal stress in the bottom of asphalt surface in the middle of porous concrete base＇s transverse contraction joint is between load stress and temperature stress. 8 tabs, 5 figs, 10 refs.