Abstract：A dynamic analysis model of coupled train-bridge-road vehicle system is established, in which the train and road vehicles are modeled by multi-rigid-body system, the bridge is modeled by spatial beam and bar elements, the wheel-rail corresponding assumption and the creep theory are used to deal with the wheel-rail contact relationship, and the bridge deck and the vehicle tires are assumed to be in point-contact and without separation. A computer simulation code is developed. With a rail-cum-road bridge as an example, the coupling vibration responses of the train-bridge-road vehicle system are analyzed. The results show that when trains and road vehicles pass the bridge simultaneously, with the increase of vehicles, the maximum vertical acceleration, derailment factor and offload factor of the train are significantly increased, showing an adverse influence of the road vehicles on the running safety of the trains.
2014, Vol. 33 
