既有铁路混凝土简支梁桥加固技术研究

研究目的:既有铁路混凝土梁桥以中小跨度为主,理论与实践表明列车提速后,大多数梁体横向刚度不足,墩台截面偏小同样会刚度不够,不能满足提速的要求,为此需要对梁体及墩台进行加固改造.本文结合漯阜铁路既有线提速及改建设计,对既有铁路混凝土简支梁桥加固进行研究,总结了一些经验,有益于其它既有线铁路桥梁加固参考.研究结论:加强混凝土简支梁横隔板横向连接,可很好地抑制桥梁横向振动；梁底粘贴钢板、增设体外预应力钢束,可有效提高梁的承载能力；加大桥墩截面可大幅度增加横向刚度；采取以上措施加固的既有铁路混凝土简支梁桥能满足提速要求.

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.