A Study On The Dynamic Interaction System Of Vehicle-Ballastless Track-Bridge System And Its Vertical Coupled Vibration Properties

Since entering the 21st century, the development of track transportation has been facing a historic opportunity. A network composed of urban rail transits, high speed railways and express passenger lines will be constructed to connect the metropolises of China.The application of ballastless tracks is an inevitable trend for the track transportation system due to its higher stability and less maintenance. However, vibration damping and noise absorption are key problems to be solved for ballastless track structures because of its high stiffness and reflectivity of noises. Due to the complexity of the ballastless track structure, the modeling of rail structures upon a bridge and dynamic couplings of vehicles, tracks and the underlying bridge are up to date not taken into consideration in most dynamic models of the vehicle-bridge coupling problems. Therefore, the research on vibration damping of the ballastless track with multi-coupling parameters is urgently required to promote the efficiency of the track transportation in our country.This dissertation focuses on the effects of usage of the ballastless track on a coupled system consisting of vehicles, tracks, ballastless tracks and bridges as well as its practical application. The main results obtained in the dissertation are as follows:1. A complete model for the coupled vibration of ballastless tracks, bridges and vehicles is presented in this dissertation. The three kinds of ballastless track structures widely used in the track transportation, i.e. slab tracks, elastic support block tracks and floating...