珠肇高铁西江特大桥主桥总体设计  

Overall Design of Main Bridge of Xijiang River Bridge of Zhuhai-Zhaoqing High-Speed Railway

作　　者：王斌[1] WANG Bin(China Railway Fourth Survey and Design Institute Group Co.,Ltd.,Wuhan 430063,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,湖北武汉430063

出　　处：《世界桥梁》2025年第1期15-21,共7页World Bridges

基　　金：中国国家铁路集团有限公司科技研究开发计划项目(N2023G040)。

摘　　要：珠肇高铁西江特大桥主桥为(70+148+2×435+148+70)m三塔斜拉桥,采用中塔设置固定支座、边塔设置纵向活动支座的支座体系,在中、边塔处均设置纵向液压阻尼器,辅助墩、边墩处设置E型钢阻尼器,并设置2对中塔加强索以提高桥梁刚度。主梁采用钢-混组合梁,钢结构采用槽形截面,桥面板采用混凝土板,负弯矩较大的主梁区段采用顶、底板双组合截面以改善主梁应力状态。辅助墩两侧共58 m范围内钢结构与混凝土桥面板采用缓粘结剪力钉连接,桥面板采用超高性能混凝土(UHPC)+钢筋混凝土(RC)组合结构,以提高桥面板抗裂性能。采用H形桥塔,由上、中、下塔柱和上、下横梁组成,桥面以上塔高与主跨跨径比值为1/3.69,桥塔及桥墩均采用钻孔灌注桩基础;斜拉索采用双索面扇形布置,全桥设置102对平行钢丝拉索以及2对中塔加强索。该桥结构验算结果表明:桥梁具有合理的刚度、良好的轨道平顺性、气动稳定性及抗风性能,能够满足高速列车运行要求。The main bridge of Xijiang River Bridge carrying a section of the Zhuhai-Zhaoqing High-speed Railway is a three-pylon cable-stayed bridge with two main spans of 435 m,two side spans of 148 m,and two side spans of 70 m.At the central pylon,fixed bearings are installed,while at the side pylons,the bearings allowing the longitudinal movement of the superstructure are installed.Additionally,longitudinal hydraulic dampers are installed at both the central and side pylons,and E-shaped steel dampers are installed at auxiliary and side piers,and 2 pairs of stabilizing cables are tensioned from the central pylons to improve the rigidity of the bridge.The superstructure consists of steel trough girders acting compositely with the overlaid concrete slabs,in the locations with bigger negative bending moments,extra deck slabs are added to the top and bottom slabs to form dual composite deck slabs to improve the stress condition of the superstructure.In the total of 58 m long portion of superstructure on the two sides of the auxiliary pier,the steel girders and the concrete slabs are connected via retard-bonded shear studs,the concrete slabs are UHPC and RC composite slabs to enhance the anti-cracking performance of the deck.The pylons are H-shaped structures consisting of upper,intermediate,and lower pylon columns as well as upper and lower crossbeams,the height of the pylons above the deck is 1/3.69 of the main span length.The pylons and piers are all supported by bored pile foundations.The 102 stay cables composed of parallel steel wires are arranged in double cable planes.The structural check calculation indicates that the bridge owns rational rigidity as well as sound track regularity,aerodynamic stability and wind resistance,and all these parameters meet the high-speed train traveling requirements.

关 键 词：铁路桥 三塔斜拉桥 钢-混凝土组合梁 中塔加强索 缓粘结剪力钉 UHPC+RC组合桥面板 桥梁设计 

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] U442.5