沥青路面永久变形的非线性粘弹-弹塑性本构模型

为了正确预估沥青路面的永久变形,对沥青路面永久变形的非线性粘弹性有限元法进行了研究,推导了广义Maxwell模型的非线性粘弹性有限元法,建立了沥青路面永久变形的非线性粘弹-弹塑性本构模型,从弹性、非线性弹性、塑性、粘弹性、非线性粘弹性等方面对沥青路面的永久变形进行了分析,对沥青路面的永久变形进行了计算,并将计算结果和SHRP的计算结果以及SWK/UN轮辙试验结果进行了对比。计算结果表明:沥青路面永久变形的非线性粘弹-弹塑性本构模型是有效的,其路面变形计算值与SHRP的计算值相对误差为6.567%,与SWK/UN轮辙试验值相对误差为6.069%。

Nonlinear viscoelastic-elastoplastic constitutive model of permanent deformation for asphalt pavement

In order to correctly predict the permanent deformation of asphalt pavement,nonlinear viscoelastic finite element method was studied,the finite element method of nonlinear viscoelasticity for generalized Maxwell model was deduced,a nonlinear viscoelastic-elastoplastic constitutive model of permanent deformation for asphalt pavementhen was set up,and the permanent deformation of asphalt pavement was analyzed depending on its material properties,such as elasticity,nonlinear elasticity,plasticity,viscoelasticity and nonlinear viscoelasticity,etc.,the permanent deformation of asphalt pavement was simulated by using the model,SHRP and SWK/UN experiment,and the numerical results were compared.Comparison result shows that their relative error are 6.567% and 6.069% respectively,the model is effective.6 tabs,10 figs,16 refs.