Research on Train Load Diagram of 400 km/h High-Speed Railway

To formulate the train load diagram suitable for the high-speed railway with a speed of 400 km/h, based on the principle of uniformly distributed live load effect of German ICE train, Chinese ZGS and the medium-speed train, 0.65UIC load is proposed as the train load diagram of 400 km/h high-speed railway, referring to the method of determining 0. 8UIC load as the train load diagram of high-speed railway in the Provisional Regulations on the Design of Beijing-Shanghai High Speed Railway. Then, for 24 m, 32 m and 40 m span simply supported beam bridges, get the dynamic responses of the train under the action of 400 km/h high-speed train by means of train-bridge coupling vibration analysis method, and the adaptability of dynamic coefficient, vertical deflection, vertical angle of beam end and rail surface irregularity under 0.65UIC load is studied. Finally, the adaptability of the limits of centrifugal force, traction force and braking force to the 400 km/h high-speed railway train is discussed when the 0.65UIC load is used as the design load. The results show that, on the basis of the current code, the 0.65UIC load as the train load diagram of the 400 km/h high-speed railway can be applied to bridge design, and the bridge design index limit and design load limit calculated by this load pattern have a certain safety reserve compared with the response between the operating train and bridges. © 2023 Science Press. All rights reserved.