Dynamic Analysis On Pavement Structure Based On The Vehicle-Road Coupling Model

Dynamic vehicle-road interaction is a new scientific branch. It deals with three main parts: vehicle, road, and dynamic problem of their interactions. Of the three parts, the study on the last one is still weak. Based on giving full consideration to the characteristics of the vehicle and road, model and dynamic equation were established,. Considering the body of vertical vibration, horizontal swing, vertical swing and the wheels of the vertical vibration and horizontal swing, the vehicle equation was established, furthermore, the balance equation of the road was established by finite element method. According to the relevant conditions between the vehicle and road, balance equation was deduced considering the vehicle-road coupled interaction.Using vibration mode superposition method, the vehicle-road coupled balance equations were simplified from thousands of mutual coupling freedom of the equation into independent mode equations. The computation program named as VEHB was developed by Visual Fortran.Finally, the dynamic response of pavement structure were analyzed such as displacement and acceleration varied with different nodes under different working conditions including the irregularity of the road, vehicle speed, vehicle load, numbers of vehicle axes. Moreover the responses with the different thickness of roads were compared. Some valuable conclusions were made as below:(1)With the increase of irregularity amplitude, the value of displacement and acceleration were larger, and the pavement structure was easier to be destroyed.(2)Different speeds of the vehicle almost have no impact on the amplitude of vertical displacement, while have a significant affection to vertical acceleration.(3)With the load increased, the response of displacement and acceleration changed seriously, when load was doubled, the value of displacement and acceleration increased twice and four times separately.(4)Under the premise of definite thickness, the variety of the pavement structure layers' thickness influenced the response of the pavement.