Study On The Dynamic Characteristics Of The Ballastless Track With Sleeper Embeded On Bridge

It is necessary to research on the dynamic characteristics of the ballastless track on bridge as a lot of ballastless track was paved on the bridges in our country. The former study of ballastless track about dynamics was focused on transient dynamics, but the study of harmonic vibration was a little. The study on this paper is mainly about harmonic vibration of ballastless track with sleeper embeded on bridge.This paper build up 3D entity model according to the actual circumstance of ballastless track with sleeper embeded on bridge. And impose harmonic loads in the central bridge as the functions of bridge, sleeper and rail are considered. So it can imitate the characteristics of the ballastless track on bridge accurately.The model is carved by finite element software reasonably, the rail is simulated by timoshenko beam element, and comparing to euler beam it not only consider the flection transform ,but also can consider the shearing and turns distortion .The sleeper ,the protecting layer of bridge and the main body of bridge were simulated by entity elements. The fastener is simulated by spring-damp element.The study on this paper is mainly about harmonic vibration of ballastless track on the bridge.This paper considers the effect on system vibration with different parameters such as the stiffness of rail pad, and the reflections include the moves of steel rail, the bed board,the bridge and so on. Therefore this paper can provide some suggestion how to reduce the vibration of the railway structure.Lastly, this paper makes a final conclusion about all above analysis. Simultaneously, this paper gives some proposals on shortages and new problems that need to be researched furthermore in future.