ANALYSIS AND PREDICTION ON ENVIRONMENTAL VIBRATION INDUCED BY ELEVATED RAIL TRANSIT

The environmental vibration induced by trains on elevated bridges is studied through theoretical analysis and numerical calculation. Two subsystem models, the vehicle-bridge model and the pier-soil model, are established. The dynamic responses of the environment are calculated using the pier-soil model, with the dynamic load obtained from the vehicle-bridge model. The influences of different parameters upon the environmental vibration are analyzed via parameter analysis. The results show that the environmental vibration induced by running trains on an elevated bridge attenuates with the distance to the bridge, and is influenced by the mass and span of the bridge, the buried depth of pier, the axis load of vehicle, the running speed of train, the properties of soil and the stiffness of bearings. The prediction formula for environmental vibration induced by urban rail transit is established based on the results of regression analysis, and is then validated through a comparison with the data measured on Beijing Metro Line 5 and other prediction formulas, where the proposed formulas show more accuracy and suitability.