Design of Main Bridge of Minjiang River Bridge of Xiangtang-Putian Railway

Research purposes: In the light of the natural environment conditionts of the bridge site,the prestressed concrete continuous girder bridge with span arrangement of(60+7×100+60) m was adopted for the main bridge of Minjiang River Bridge of the Xiangtang-Puian Railway.A variable cross section box girder with single box,single chamber and vertical webs was adopted for the main girder of the main bridge with three-way prestresssing system.The piers of the main bridge were designed as the round-end solid piers,resting on the bored pile foundations.The softwares were used to analyze the plane static force,the seismic design of the main bridge structure,the train-bridge dynamic responses and the calculation of the braking force on deck of the bridge for providing the basis for the bridge design.The research results can be as the reference to the similar bridges. Research conclusions:The normal stress in top and bottom slabs of the girders and the shear force in weds could meet the relevant requirements in the codes.After adding the viscous dampers on the No.38 and No.40 piers,the structure could meet the seismic requirements.The main bridge structure had good dynamics with good traveling capacity for the train and it could meet the demands of the train running safety and passenger comfortableness.