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大跨铁路混凝土梁矮塔斜拉桥结构体系研究

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

railway bridgeextradosed bridgestructural systemcombined pylon-girder fixity and rigid-frame systemstatic propertydynamic propertyfinite element method

刘晓春、符应文、李海华、谢腾飞、韦国华

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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

中南大学土木工程学院,湖南 长沙 410075

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

中铁二院工程集团有限责任公司,四川 成都 610031

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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

国家自然科学基金项目国家自然科学基金项目中国中铁股份有限公司科技研究开发计划重大专项课题

U1934217520784982021-专项-04-2

2024

10.20051/j.issn.1003-4722.2024.04.019

桥梁建设
中铁大桥局集团有限公司

桥梁建设

CSTPCD北大核心
影响因子：1.428
ISSN：1003-4722
年,卷(期)：2024.54(4)