Prediction and mitigation analysis of ground vibration caused by running high-speed trains on rigid-frame viaducts

摘要

In this study a 3D numerical analysis approach is developed to predict the ground vibration around rigid-frame viaducts induced by running high-speed trains.The train-bridge-ground interaction system is divided into two subsystems:the train-bridge interaction and the soil-structure interaction.First,the analytical program to simulate bridge vibration with consideration of train-bridge interaction is developed to obtain the vibration reaction forces at the pier bottoms.The highspeed train is described by a multi-DOFs vibration system and the rigid-frame viaduct is modeled with 3D beam elements.Second,applying these vibration reaction forces as input external excitations,the ground vibration is simulated by using a general-purpose program that includes soil-structure interaction effects.The validity of the analytical procedure is confirmed by comparing analytical and experimental results.The characteristics of high-speed train-induced vibrations,including the location of predominant vibration,are clarified.Based on this information a proposed vibration countermeasure using steel strut and new barrier is found effective in reducing train-induced vibrations and it satisfies environmental vibration requirements.The vibration screening efficiency is evaluated by reduction VAL based on 1/3 octave band spectral analysis.