Analysis of Train-Bridge Coupled Vibration of Long Span Railway Steel Truss Arch Bridge

To ensure that the train can have good traveling performance when passes through a long span railway steel truss arch bridge at high speed and also to ensure that the bridge can have good dynamic safety,the train-bridge coupled vibration of the bridge of such type is analyzed.Based on the theory of the train-bridge coupled vibration,the track random irregularity is simulated by the trigonometric series method,the wheel-rail forces are iterated and derived simultaneously by the equations of the wheel set bouncing vibration and rolling vibration and the bridge and train responses are then derived by the iteration method.By way of example of Dashengguan Changjiang River Bridge in Nanjing,the methods recommended herewith are used to analyze the bridge and train dynamic performance when different types of the trains(e.g.the German ICE3 MUs Train,China Star Train,Nanjing Light Rail Train and Empty Load Freight Train P62) pass through the bridge at different speeds.The results of the analysis demonstrate that the indices of the safety of the bridge,the safety and smoothness of the trains can all satisfy the requirements,the smoothness of the trains is good and the calculation models and simplified calculation of the recommended methods can be applied to the train-bridge coupled vibration analysis of the bridges of similar type.