摘要
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 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 can well control the lateral vibration the transverse connection of the diaphragm of the concrete simple -supported beam 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 soeed -raise reauirements.
出处
《铁道工程学报》
EI
北大核心
2011年第12期54-56,63,共4页
Journal of Railway Engineering Society
关键词
既有铁路
混凝土简支梁桥
加固
研究
existing railway
concrete simply - supported beam bridge
reinforcement
research
