大跨铁路混凝土梁矮塔斜拉桥结构体系研究  

Research on Structural Systems of Long-Span Railway Concrete Girder Extradosed Bridge

作　　者：刘晓春[1,2] 符应文 李海华[1,3] 谢腾飞 韦国华 LIU Xiaochun;FU Yingwen;LI Haihua;XIE Tengfei;WEI Guohua(National Engineering Research Center of High-Speed Railway Construction Technology,Central South University,Changsha 410075,China;School of Civil Engineering,Central South University,Changsha 410075,China;China Energy Engineering Group Guangdong Electric Power Design Institute Co.,Ltd.,Guangzhou 510663,China;China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)

机构地区：[1]中南大学高速铁路建造技术国家工程研究中心,湖南长沙410075 [2]中南大学土木工程学院,湖南长沙410075 [3]中国能源建设集团广东省电力设计研究院有限公司,广东广州510663 [4]中铁二院工程集团有限责任公司,四川成都610031

出　　处：《桥梁建设》2024年第4期134-140,共7页Bridge Construction

基　　金：国家自然科学基金项目(U1934217,52078498);中国中铁股份有限公司科技研究开发计划重大专项课题(2021-专项-04-2)。

摘　　要：为研究不同结构体系对大跨铁路混凝土梁矮塔斜拉桥力学性能的影响,并寻求最优的结构体系,以崇凭铁路上金左江双线特大桥为背景,采用MIDAS Civil和ANSYS软件建立主桥有限元模型及车-轨-桥耦合动力学模型,对半飘浮体系、刚构体系、塔梁固结体系和塔梁固结-刚构组合(高墩塔墩梁固结、矮墩纵向设置双排活动支座)体系方案进行比选,分析典型工况下主桥的静、动力特性。结果表明:在列车活载和温度作用下,采用塔梁固结-刚构组合体系的桥梁受力性能良好,采用较小的梁高即可满足桥梁结构的刚度要求;CRH2列车编组通过时不同结构体系的桥梁结构和列车编组的动力响应值均满足要求,考虑温度变形影响时不同结构体系对列车运行的安全性和舒适性的影响较小。基于力学性能计算结果,上金左江双线特大桥主桥最终采用塔梁固结-刚构组合体系。This study investigates the mechanical properties of the long-span railway concrete girder cable-stayed bridges with different structural systems and the optimal structural system for such type of bridge.The Shangjin Zuojiang River Double-Track Railway Bridge of the Chongzuo-Pingxiang Railway is used as a prototype bridge.The train-track-bridge interaction was modelled in MIDAS Civil and ANSYS,respectively,to compare multiple structural systems,including the semi-floating system,rigid-frame system,pylon-girder fixity system,and the combined pylon-girder fixity and rigid-frame system that features the pylon-girder-pier(high-rise piers)fixity and two longitudinal rows of bearings on top of low piers.The static and dynamic properties of the main bridge were analyzed under typical loading conditions.It is concluded that under the action of train loads and thermal effect,the bridge with a combined pylon-girder fixity and rigid-frame system exhibits excellent load bearing performance,which can achieve sufficient stiffness even with low-depth girders.The dynamic responses of the bridge with different structural systems and the passing CRH2 trains meet the requirements,while counting thermal effect,the train travelling safety and comfort is not sensitive to the selection of structural systems.Based on the calculation of the mechanical properties,a combined pylon-girder fixity and rigid frame system was selected for the main bridge of Shangjin Zuojiang River Double-Track Railway Bridge.

关 键 词：铁路桥 矮塔斜拉桥 结构体系 塔梁固结-刚构组合体系 静力性能 动力性能 有限元法 

分 类 号：U448.13[建筑科学—桥梁与隧道工程] U448.27[交通运输工程—道路与铁道工程]