The Mechanics Characteristics Of Ballastless Track On Bridge During Earthquakes

In order to meet the requirements on the smoothness of track and the safety of running trains, the viaduct bridges stretching several kilometers or even tens of kilometers are often built on high-speed railway lines, which greatly increases the probability of the trains on the bridge when earthquakes occur. So, the dynamic responses of ballastless track on bridge under earthquakes have become an necessary research subject.The history and the studies of the structure, mechanics of ballastless track,train-bridge interaction system and the bridge seismic design in the past and now in the world are reviewed. On the basis of track structural mechanics, we can do a study on the mechanics characteristics of ballastless track on bridge during earthquakes. The main research work in the present dissertation involves:Three-dimensional finite element models of slab track on bridge are established. The dynamic response analysis is executed with the model of 2 calculational methods: transient analysis and spectral analysis. Both of earthquake waves are used in transient analysis, they are earthquake wave of Ninghe of Tianjin and Taft. Both of acceleration waves are used in spectral analysis. The result of the study shows that:the distortion of rail follows the distortion of bridge; The differentia of the distortion of the transect of bridge is distinctness. The force of CRTSâ… is smaller than that of CRTSâ…¡. The manner of the construction method of the ballastless track can affect the distortion of bridge.In this article, we acquire the mechanics characteristics of ballastless track on bridge during earthquakes which can be reference to the engineering design and study.