昌九高铁扬子洲赣江公铁大桥西支主桥桥塔设计  

Design of Pylons of West Main Bridge of Yangzizhou Ganjiang River Rail-cum-Road Bridge Carrying a Section of Nanchang-Jiujiang High-Speed Railway

作　　者：郭安娜 严爱国[1] 王新国[1] 崔苗苗[1] 周刚[1] GUO Anna;YAN Aiguo;WANG Xinguo;CUI Miaomiao;ZHOU Gang(China Railway Siyuan Survey and Design 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》2024年第2期14-20,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课题(N2023G040);中铁第四勘察设计院集团有限公司科技研发项目(2020K007,2022K111)。

摘　　要：昌九高铁扬子洲赣江公铁大桥西支主桥采用竖琴形索面箱桁组合梁斜拉桥,跨径布置为(48+144+320+144+48)m。根据桥梁结构特点,针对花瓶形、H形和钻石形桥塔方案,从结构受力、景观效果、施工难度、经济性等方面进行比选,最终采用适应宽主梁、竖琴形索面的花瓶形桥塔。2座桥塔高度分别为143.5 m和147.1 m,采用C50钢筋混凝土结构,由上、中、下塔柱组成,塔柱圆弧过渡,设上、下2道横梁,下横梁采用预应力混凝土结构,上横梁由2道反向圆弧的预应力混凝土小横梁和中间的装饰性钢结构共同组成“昌”字造型。索塔锚固区采用钢锚箱锚固体系与预应力锚固体系相结合的方式。桥塔下塔柱采用翻模法施工,中、上塔柱外部采用爬模法施工、内部采用翻模法施工。对桥塔进行整体静力、局部应力、稳定性及抗震分析,结果表明桥塔强度、刚度、稳定性及抗震性能均满足规范要求。The west main bridge of Yangzizhou Ganjiang River Rail-cum-Road Bridge that carries a section of the Nanchang-Jiujiang High-speed Railway is a cable-stayed bridge with a main span of 320 m,two side spans of 144 m and two end spans of 48 m.The superstructure consists of steel trusses acting compositely with steel box deck.Compared from perspectives of load bearing behavior,landscaping effect,construction challenges and economy,the vase-shaped pylon with harp cable planes was considered superior to the H-shaped and diamond-shaped pylons.The two pylons,rising 143.5 and 147.1 m,respectively,are reinforced concrete structures(C50 concrete)that consist of the upper,intermediate and lower columns,transitioned with sleek curves.Each pylon has a prestressed concrete lower crossbeam and an upper crossbeam composed of two small transverse prestressed concrete beams with reverse curves and the in-between steel ornamental struts,resembling the Chinese character"昌"(representing Nanchang,the capital of Jiangxi Province).The stay cables are anchored to the pylon via steel anchor boxes,complemented with prestressing tendons.The lower pylon columns were cast by jumping formwork,the intermediate and upper pylon columns by climbing formwork,and the inner components by jumping formwork.The analysis of static property,local stress,stability,and seismic responses of the pylon proves that the strength,stiffness,stability and seismic performance of the pylon meet the code requirements.

关 键 词：斜拉桥 公路铁路两用桥 花瓶形桥塔 文字装饰横梁 索塔锚固 受力分析 桥梁设计 

分 类 号：U443.38[建筑科学—桥梁与隧道工程] U442.5[交通运输工程—道路与铁道工程]