Research on Reinforcing Technology for Existing Railway Concrete Simply-supported Beam Bridge

Research purposes: The existing railway concrete simply-supported beam bridge is mainly of medium and small span style.The theory and practice showed after the train speed-raise,the lateral stiffness of the most beam was not enough and the pier stiffness was not enough because the pier section was small.They could not meet the speed-raise requirement,so it was necessary to reinforce the beam and pier.For the upgrading plan of the Luohe-Fuyang Railway,the study was done on the reinforcing technology for the existing railway concrete simply-supported beam bridge and the the experience of it was summed up for offering the reference to the similar works. Research conclusions:Strengthening the transverse connection of the diaphragm of the concrete simple-supported beam can well control the lateral vibration of the bridge.Adding the beam bonding steel plates and the external prestressing steel strands can effectively increase the load-bearing capacity of the beam.Enlarging the cross section of the pier can greatly enhance the lateral rigidity of the piers.The existing railway concrete simply-supported beam bridge reinforced by taking the above measures can meet the speed-raise requirements.