Analysis Of Creep Effect For Ballastless Track Bridge

At present, China pays more and more attention to the developing of high-speed railway and special line for passenger transport, which needs a lot of ballastless tracks and this is the golden time for the development of the ballastless track. Many viaduct bridges are built in high-speed railway and special line for passenger transport. The creep of the bridge has important influence on the deformation of the ballastless track plate. So it is important value in analysis of creep effect for ballastless track bridge.Firstly, this thesis studies the mechanism and nature of the shrinkage and creep, analyzes the main factors which affect the shrinkage and creep of concrete and creep mode, and summaries the basic theory and calculation method of the shrinkage and creep.Then, this thesis takes the New Beibei Jialing River as the study object, and the finite element model of rail-plate-bridge is built by ANSYS. Creep of metal in ANSYS is revised as creep of concrete which has succession, and the method is used on analysis of creep effect in long bridge. Compared with the condition of creep and no creep, there are differences in deflection of bridge and deformation of track plate. Because creep has important influence on deflection of bridge, and the deformation of bridge directly influences the deformation of track plate, this thesis emphasizes on the deformation of the long bridge which influences the above ballastless track plate.At last, this thesis discusses the method of reducing deformation of track plate by materials, design, construction and structure of ballastless track.