Study On The Vibration Performance Of Elevated Station And Track Structure In Urban Rail Transit

With fast development of urbanization and increasing traffic pressure and problems, it is necessary to develop a large capacity urban public traffic. Urban rail transit has made many progresses and improvements in recently years, which is good at large capacity, high speed, nice safety, precise time, saving energy and so on. Elevated rail transit is obtaining more and more attention and application, as it is an economic, useful and high efficiency high speed transportation. It has three outstanding points, which are small technology difficulty to design and establish, low expenses, and short time to finish. The elevated station generated with the development of such new system. Regarding elevated station and track structure as a system, on the background of space elevated station, this report make analyses on the vibration performance when the totally system is under dynamical effect, especially pay more attention on to the effect on vibration performance when parameter on each part differs.After a brief analysis on relevant studies of present urban elevation rail transit vibration performance, this paper sets up a three-dimensional dynamical analysis model, and considers the components and connections of each part of system. On the basis of above analysis, this paper makes extended modal analysis to the model, and achieves the first ten steps natural frequency and relevant mode shape of the system.On the basis of above model analysis, this paper separately analyses the vibration performance under the harmonic vibration loads and train moving loads. During the analysis of harmonic vibration, this paper considers the effect on system vibration when some parameters differ such as the stiffness of rail pad, the mass of elastic support block. While at the analysis of transient dynamics, this paper mainly refers to the velocity of train in both single and bidirectional direction, the stiffness of rail pad, and so on. And then, this paper gets some good conclusions and suggestions.Lastly, this paper makes a final conclusion to all above analysis. And simultaneously, this paper gives some proposals on shortages and new questions need to be researched furthermore in future.