The Typical Non-uniform Tire-road Contact Stress Obtained And The Road TDC Analysis

In our country, as per the design specifications, bicircular uniformly distributed static load is used in asphalt pavements to assume vehicle load, which ignores the non-uniformity of vehicle load distribution. On the other hand, assuming that asphalt pavements are a multi-layer elastic system, the viscoelasticity of asphalt pavements is neglected. Meanwhile, with the continuous thickening of the top layer of asphalt concrete, there are growing TDC in asphalt pavements, and therefore it is need to study the impact of tire-road contact on TDC.To begin with, based on the ABAQUS software, the constitutive relation of tire constituent materials, anisotropy of tire cords and nonlinearity of tire deformation were considered. And, the influence of material properties orientation, tire mesh generation and contact property, to the convergence of tire finite element model was analyzed.Secondly, grounded on the explicit/implicit dynamic analysis in ABAQUS, the influences of the speed and accelerated speed of tires were investigated on the three-dimensional grounding stress, including vertical stress, horizontal stress and longitudinal stress. Further, the three-dimensional connection stress distributions of different patterns, different tire pressure and different tire loads were studied under different working conditions, as well as their relationship with the maximum values. Moreover, these were verified by measuring.Then, through ABAQUS post-processing output programs, the three-dimensional stress of complex tread tires and rigid pavements under different condition was extracted. In addition, typical viscoelastic modeling for asphalt pavements was established, which included upper layer, middle layer, lower layer, semi-rigid base and soil. By using ABAQUS DLOAD subroutine to act the extracted three-dimensional grounding stress on the modeling for asphalt pavements, considered the mechanical factors influencing TDC of asphalt pavements, the three-dimensional stress distribution of the upper layer of asphalt pavements was analyzed under the complex tread tire loads and different working conditions. The results show that the braking and traction of tires will affect TDC of asphalt pavements, and the main influential indicator is the longitudinal shear stress.Finally, on the basis of the force analysis of TDC of asphalt pavements, the displacement, strain and stress response of all pavement courses were analyzed.