Interaction Between Girder And Rail Of Rail Transit Viaduct With U-shape Girder

The research of interaction between girder and rail in this thesis is based on the domestic and foreign. In view of the urban rail transit viaduct structural style, this thesis proposed useing the interaction between girder and rail model considering the influence of successor structure,it established a finite element mechanical model for the thorough research of longitudinal interaction between girder and rail in the urban rail transit.The principle of interaction between rail and bridge has been reasoned, the mechanism of the formation of longitudinal additional forces are profoundly discussed, the solution method of interaction between rail and bridge and also the computation model used in the domestic and foreign are introduced. Through analyseing the difference of the urban rail transit and the railway (the skeleton line railroad), explained that it's unreasonable for direct introduceing the design theory and the computation model of the railway to the urban rail transit. This thesis proposed the computation model which considers the successor structure influence according to the urban rail transit bridge's characteristic.This thesis deduced the longitudinal horizontal rigidity of the successor structure,and established two-dimensional finite element statics model for interaction between rail and bridge in the urban rail transit,and also carried on the corresponding contrast confirmation to this mechanical model's rationality.This thesis utilizes plane mechanical model which established for simple support box girder, analyzes the essential feature of longitudinal additional forces for multispan simple support beam bridge in the urban rail transit. The many primary factors which influence the interaction between rail and bridge in the urban rail transit are discussed, and the most important factor substructure longitudinal horizontal rigidity is gived more thorough study. According to the computation result, puts forward some proposals to the pier longitudinal rigidity limiting value in the urban rail transit bridges. This thesis also established the spatial finite element model for U-Shape girder, considered the bottom-through bridge space interaction relations between girder and rail. The thesis analyzed the essential feature of longitudinal additional forces for multispan simple support U-Shape girder, discussed the many primary factors which influence the interaction between rail and bridge in the urban rail transit. And then contrast the computed result to the plane's box girder,proposes some meaningful conclusion.