Abstract：There exist a series of problems when using the traditional Hertz spring model for dynamic analysis of vehicle-bridge coupling vibration. Based on the simple model both for vehicle and bridge, the dynamics of vehicle-bridge coupled and uncoupled equation is derived. Usually, the rail shows some irregularities, such as the periodic and stochastic irregularities. When the vehicle moves on this kind of rail, it will jump if the centrifugal force is greater than the weight of the vehicle. Afterward, the vehicle will fall back to the beam under the action of gravity. During this course, an impact force will produce onto the beam. The paper proposed the role of impact laws and determined the impact parameters by finite element simulation. On the platform of MATLAB, the program code was edited for the single-axel vehicle model moving on the simple supported beam. The numerical results showed that the dynamic model involving vehicle impact force presents some more accurate response for vehicle-bridge coupling vibration characteristics. Furthermore, the model given in this paper can denote jump height about the vehicle. For the cases of periodic and stochastic irregularities with same amplitude, the stochastic irregularities will causes larger response for both bridges and vehicle, which will results in worse effect for comfortable ride as well as the safety. For this reason, we should pay more attention to the stochastic irregularities in vehicle-bridge coupling dynamic analysis.
2016, Vol. 37 
