Vehicle road Coupling Force Characteristics and Dynamic Responses of Concrete Pavements

Abstract:

When vehicles moving at a uniform speed on concrete pavements, the influences of different parameters, such as the vehicle parameters (concentrated mass, suspension stiffness and tyre stiffness), the pavement structure parameters (pavement thickness, joint width, joint faulting, joint load transfer capacity etc.) and the sub grade parameters (sub grade reaction modulus, sub grade damping and sub grade strength weakening index etc.), on the time varying force are systematically analyzed with the established quarter vehicle road coupling dynamics model and the direct integration method. The curves of loading impact factor (dynamic load upon static load) against a variety of parameters are provided, and the statistic characteristics of loading impact factor is also depicted. Then, the dynamic displacement and strain of concrete pavements are discussed accordingly. The results show that the variance of time varying force is getting larger with the increase of the vehicle moving speed, and the dynamic effects of displacements and strains on concrete pavements become more remarkable; therefore, while designing concrete pavements, the dynamic effects of concrete pavement arising from vehicle road interaction shall be considered.