The Transverse Dynamic Performance Study Of High-Speed Railway Switch Bridge

In recent years, our country has ushered an new rail era with a lot of high-speed railway construction. Bridges as the important part of high-speed rail system, they are vital elements of the economic functioning of modern societies. Because many station terrain and other irresistible factors influence, lead to a lot of railway switch must set on bridge through the way of erect viaduct. When placed on the bridge, high-speed railway switch needs a highly stable environment to ensure the normal work. Therefore the performance requirements of bridge structure is very high, especially the bridge's dynamic performance. This paper used a railway switch bridge and a cross-over track bridge for engineering background, they are on the Xi'an to Chengdu high-speed railway located in JianMenGuan.Paper did some analysis and calculate works about the two bridges by finite element software. Focused on the following aspects of the research work:1) Summary the status study of the bridge's dynamic response under train moving and introduce the theoretical foundation of bridge's dynamic property.2) Use Algor software established finite element model of two bridges. Analysis the serpentine movement of the train vehicles, takes the reasonable assuming and values, and carries on a specific simulation of transverse swing force which will be used for dynamic analysis.3) Based on the above work, paper have calculated the dynamic response of two bridges when single quarter train and the whole train separately through the bridge. There are received through analysis of the vibration modal and displacement response that two bridges design are feasible. The transverse vibration of bridge not only concerns its characteristic property closely but also relates to vehicle velocities, serpentine movement frequencies and vehicle types. Finally the paper brings some guiding suggestions to the design and experiment of the same type bridge.