桃夭门公铁两用大桥主桥方案比选  

Main Bridge Type Selection for Taoyaomen Rail-cum-Road Bridge

作　　者：张晶 肖海珠[1] 潘韬[1] 易莉帮 徐科英[1] ZHANG Jing;XIAO Haizhu;PAN Tao;YI Libang;XU Keying(China Railway Major Bridge Reconnaissance&Design Institute Co.,Ltd.,Wuhan 430056,China)

机构地区：[1]中铁大桥勘测设计院集团有限公司,湖北武汉430056

出　　处：《桥梁建设》2025年第2期132-138,共7页Bridge Construction

基　　金：中国中铁股份有限公司科技研究开发计划项目(2019-专项-01)。

摘　　要：桃夭门公铁两用大桥主桥采用主跨666 m的混合梁斜拉桥,边中跨比为0.3,主梁采用三箱分离式混合梁,公铁平层布置。结合桥位处建设条件,提出自锚体系与部分地锚体系斜拉桥2种桥式方案,从力学性能及施工难度两方面进行综合比选,结果表明:2种桥式方案总体受力较为接近,而部分地锚体系斜拉桥方案施工难度较大,因此推荐采用自锚体系斜拉桥。进一步对自锚体系斜拉桥方案桥塔塔型方案与钢-混结合面位置方案进行比选,结果表明:相比H形桥塔方案,倒Y形桥塔方案箱间横梁纵向剪力较小,主梁刚度更大,且经济性更好,推荐采用倒Y形桥塔方案;钢-混结合面设置于边跨侧距离桥塔中心线53 m和11 m及中跨侧距离桥塔中心线18 m三种钢-混结合面位置方案的钢梁轴力较为接近,考虑到钢-混结合面设置于边跨侧距离桥塔中心线53 m时钢梁弯矩、应力幅值以及位移幅值最小,且施工难度较小,推荐采用该方案。The main bridge of Taoyaomen Rail-cum-Road Bridge was finalized to be a hybrid girder cable-stayed bridge with a main span of 666 m and a side span-to-main span ratio of 0.3.The superstructure transversely consists of three box girders that are connected to be an entirety via crossbeams,creating a deck accommodating both road and rail traffic.During the concept design,two types of bridges were compared from the perspectives of load bearing capacity and construction difficulties,including the self-anchored cable-stayed bridge and the partially-earth-anchored cable-stayed bridge.Although the two types of bridges are competitive in load bearing capacity,the self-anchored cable-stayed bridge was selected for the ease of construction.The details of the pylons and the locations of the steel-concrete interface were discussed.The inverted Y-shaped pylon was recommended,which was considered superior to the H-shaped pylon in terms of the small longitudinal shear in the connecting crossbeams of the steel box girders and greater stiffness of the superstructure and better economy.Three locations were considered for the steel-concrete interface,including the locations 53 m and 11 m to the pylon centerline from the side span as well as the location 18 m to the pylon centerline from the central span,which is not closely associated with the axial forces of the steel girders,but the location of 53 m to the pylon centerline from the side span was selected,considering the reduced stress and displacement ranges and easier construction.

关 键 词：公路铁路两用桥 斜拉桥 混合梁 自锚体系 部分地锚体系 桥塔塔型 钢-混结合面 方案比选 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U448.121[交通运输工程—道路与铁道工程] U442.5