Railway Arch Shaped Coupling Vibration Study

Special-shape arch bridge is a new type of bridge structure, It is widely used in High-speed rail bridges for its unique and beautiful in structure shape. However, At present there's very little research on a special-shape arch bridge,this paper makes a systematic study on the Hebi bridge of Shiwu Passenger Dedicated Railway Line. The works completed in the paper are as the following:1. This paper first introduces the origin and characteristics of the Special-shape arch bridge,With the summary of vehicle-bridge coupled vibration questions, it describes the necessity of the study on the Special-shape arch bridge.2. Based on the principle of total potential energy with stationary value in elastic system dynamics and the "set in right position" rule for formulating system matrixes,special-shape arch bridge spatial finite element models are established. It also analyzes the natural vibration characteristics.3. Germany ICE3,France TGV,Japan E500 and China-made C300 high-speed train across the bridge at different speed from 160 km/h to 420km/h respectivly, Single line and double's line dynamic response of the vehicle-bridge system is analyzed. The results show that the special-shape arch bridge has good dynamic characteristics. and train running performance.4. Germany ICE3 high-speed train across the bridge at different speed from 160 km/h to 420km/h respectivly, Considering different design parameters of the bridge,Single line dynamic response of the bridge is analyzed. conclusions are as follows:on the original basis,Improving main girder,arch rib and pier stiffness has little effect on the train responses;bridge vertical stiffness can be increased effectively by increasing longitudinal girder height and suspension rod area and vector height.