多孔混凝土基层缩缝处沥青面层荷载应力分析

Analysis of Load Stress of Asphalt Surface on Transverse Contraction Joint of Porous Concrete Base

为了研究多孔混凝土基层上覆沥青面层的受力状态,建立了沥青路面三维有限元模型,引入横观各向同性弹性本构关系模型作为正交各向异性接触模型,利用有限元软件ANSYS计算了多孔混凝土基层缩缝处沥青面层的荷载应力.计算结果的对比分析表明:当沥青面层模量不超过1 600 MPa时,多孔混凝土基层缩缝处沥青面层处于受压状态.荷载作用下,多孔混凝土基层缩缝处沥青面层内的最大剪应力随面层模量的增加而减小,随面层厚度的增加而减小,随基层厚度的增加而减小,随基层与地基模量比的增加而增加.

In this paper,three-dimension finite element model of asphalt pavement,which includes transverse contraction joint of porous concrete base and asphalt surface,is established for the purpose of analyzing load stress of asphalt surface which is located in transverse contraction joint of porous concrete base.Horizontal isotropic elasticity constitutive model is regarded as orthotropic interface model.ANSYS is employed to do mechanical analysis in asphalt surface which is located in transverse contraction joint of porous concrete base of asphalt pavement.Analysis of load stress shows that asphalt surface,which is located in transverse contraction joint of porous concrete base of asphalt pavement,is in the state of compression when the surface＇s modulus is no more than 1 600 MPa.Meanwhile,calculation results with the same factors are compared with each of her,and the results indicate that maximum shear stress,which is caused by load,is evident in asphalt surface which is located in transverse contraction joint of porous concrete base of asphalt pavement.Maximum shear stress decreases,decreases,decreases and increases respectively with increase of the surface＇s modulus,the surface＇s thickness,base＇s thickness and ratio of base＇s modulus to foundation＇s modulus.