The Seismic Response Analysis Of High-speed Train And Bridge Coupling System

Along with the acceleration of high-speed train, the increasing of freight train load, and the comprehensive construction of high-speed train, the dynamic interaction of the train and bridge has become an important subject. At the same time, we are facing seismic damages more and more frequently, so considering the influence of the earthquake on the rain and bridge has become an important link to ensure the safety of train running. High-speed railway earthquake alarm system and emergency disposal system has become an effective technical means of seismic safety guarantee for high-speed trains. Seismic response of the train and bridge coupling system analysis is known as the basic work for the seismic performance of high speed railway train-bridge system, it is also known as the significant link to High-speed railway earthquake alarm system for threshold analysis. So, In order to ensure the security of train running, we must consider the effects of earthquakes on the train and bridge.Base on the domestic and foreign analysis of the coupling system,this thesis summarized and absorbed the existing research and results. Some researches on the seismic response of the coupling system have been done in the thesis as follows:1) The current situation and research significance as well as the problems of seismic response of the train and bridge coupling system that exit so far are systematically illustrated.In the study of the past, seismic design of bridges and the dynamical response of train and coupling system were two independent subjects. Nowadays the probabilities of suffering from the seismic load are increased when the train runs on the bridges, so this subject should be paid more attention to.2) Based on the design parameters of high-speed train bridges, the train and bridge coupling system is established by Midas-Civil.By considering the loads of the trains, the natural vibration of the coupling system and bridges have a big difference. With the exchanging of the model’s parameters, the change rule of natural vibration characteristics is selected, which can provide basis for the subsequent analysis.3) Seismic response of the coupling system and the train safety evaluation were done.With the contact of bridge model and train model, the dynamic response of the bridge and train was calculated under seismic excitation and track irregularity data. The change rules of derailment coefficient, lateral wheel-rail force and rate of wheel load reduction were given under different speed of trains and different seismic actions. At last, the reliability of the data was proved and the relevant conclusion was given.4) The dynamic response analysis of bridge structure was completed under a fast moving train load.Bridge deck reactions were calculated under static train load, moving train load and seismic load. The contribution value of the moving train load was small but should not be neglected by compared with the seismic load. The dynamic response of a bridge deck node value was increased with the increase of the speed of a train.