Railway Bridge The Train Running Safety And Comfort

As the increase of the train' speed, the dynamic impact effects to the bridge by the train will also be strengthened. It will cause the vibration of the bridge. And the vibration of the bridge will affect to the vibration of the running train on it. The coupled vibration of the vehicle-bridge have important influence to the safety of the train and the normal service of the bridge structure. The vibration response of the bridge and vehicle when the train passes at the different speed is studied in this paper. And also the safety and the comfort of the train running on bridge is also researched in the theses. This paper includes the main job and the research production as follow:1,based on a lot of the documents, the present researches at home and broad about the vibration of the coupled vehicle-bridge at the high speed of the train is illustrated in the paper.2,The coupled vibration model of the vehicle-bridge is established. The oscillation differetial equation of the vehicle and bridge is built by finite element method. At the consideration of the unsmooth of the track, based on the junction condition of the vehicle-bridge, the coupled oscillation equation of the vehicle-bridge is established.3,The related standard value about the train's safety and comfort on the bridge is analyzed in this thesis. The limiting value of the bridge's transverse stiffness which impacts the safety of the train running on it is discussed in the paper.4,The runnability of the train on Jialing river great bridge is analyzed and calculated in the paper. Selecting a three-span continuous beam bridge and writing program in Fortran language,the vibration response of the bridge and the vehicle is calculated and the response time history curve is pictured. At last, the index of the safety and comfort of the train is calculated and verified.