Research On Mechanical Characteristic Of Ballasted Track Structure On Bridge Of High-speed Railway & Structure's Selection

With excellent stability and low maintenance workload,non ballasted track becomes the development direction of the high-speed Railway track structure.Most line of Beijing-Shanghai High-speed Railway is non ballasted track. Considered ballasted track has better damping performance,ballasted track is used for some elevated stations,and long-span bridges and so on.9%of Beijing-Shanghai High-speed Railway's main line is ballasted track,and 77%of it is on the bridge. Ballasted track structure on bridge of high-speed Railway is complicated.Now there is no systematic research on it in our country,especailly for the line which speed is more than or equal to 300km/h.So it is very necessary to make a research on ballasted track structure on bridge of high-speed Railway.By research on mechanical characteristic of ballasted track structure on bridge of high-speed Railway,the text could provide a theoretical basis for the design of high-speed Railway ballasted track structure on bridge, and the results can be used for the construction of Beijing-Shanghai High-speed Railway.The research is of great significance for development of high-speed Railway in our country.Based on the vichecle-ballasted structure-bridge system,taking Beijing-Shanghai High-speed Railway as an example,the author mainly does the following work:1.The domestic and abroad development and application overview on ballasted track is discussed,especially for high-speed Railway ballasted track structure on bridge in Japan,France and German.And then the exiting deflect of high-speed Railway ballasted track structure on bridge is pointed out.2.In accordance with ballasted track structure's characteristic in our country,the author establishes a three-dimensional dynamic model of vichecle-ballasted structure-bridge by ADAMS/Rail and ANSYS.The track irregularity is considered with the Germany low-disturbing spectrum in this model.3.Based on the former model,the author makes a research on systems dynamic characteristics of 3 different common sleepers ballasted track structure on bridge of high-speed Railway,which includeâ…¢-type sleeper ballasted track structure,broad sleeper,and ladder sleeper.And by a comparative analysis of calculation results,a proposal of sleeper's selection is offered to the design of high-speed Railway ballasted track structure on bridge. 4.In this paper,the author takesâ…¢-type sleeper ballasted track on bridge as an example,analyses the effect of some key parameters,such as fastener stiffness,stiffness of rubber pad under sleeper,elastic modulus of ballast,and mattress under ballast,on the systems dynamic performance.Based on the above work,suggestions are put forward for the design of high-speed Railway ballasted track structure on bridge.