ABSTRACT

This paper describes the elastic tire–pavement tractive rolling contact, by means of a semi-analytical method, in order to analyse top-down cracking. The model includes the actual tire profile and assumes the tyre to be elastic, linear and homogeneous, as modelled by an equivalent Young's modulus. The pavement is modelled as a half-space layer composed of asphalt concrete acting as a homogeneous elastic material. Results display the vertical contact stress and shear contact stress in both braking and turning cases; they also highlight the stick/slip zones within the contact area. When applied, these stresses allow computing the tensile strain responses at the pavement surface. Analysis shows that the maximum tensile strains are able to cause top-down cracking. Such strains are higher than the level considered in current pavement design models. A top-down cracking analysis is ultimately conducted according to the French method of bottom-up pavement design.

摘要

本文通过半解析方法描述了弹性轮胎与路面的牵引滚动接触，以分析自上而下的开裂。该模型包括实际的轮胎轮廓，并假设轮胎是弹性的、线性的和均匀的，由等效杨氏模量建模。路面被建模为由沥青混凝土作为均质弹性材料组成的半空间层。结果显示了制动和转弯情况下的垂直接触应力和剪切接触应力；它们还突出显示接触区域内的粘/滑区域。应用时，这些应力允许计算路面表面的拉伸应变响应。分析表明，最大拉伸应变能够引起自上而下的开裂。这种应变高于当前路面设计模型中考虑的水平。