摘要
宁波三官堂大桥主桥为三跨连续钢桁梁桥,跨径布置为(160+465+160)m,主跨桥面宽45.9 m,边跨桥面宽37.9 m。主桁采用2片变高N形桁,跨中桁高14.5 m,中墩墩顶桁高42.0 m,边墩墩顶桁高15.0 m。2片主桁横向间距33.7 m,基本节间距15.0 m,中墩墩顶附近节间距18.75 m,主桁杆件均采用板肋加劲箱形断面。主桁上平联采用菱形布置,V撑处下平联采用K形布置,平联杆件采用箱形或H形断面。桥面系采用正交异性钢桥面板,板桁结合,共同参与受力。为解决边墩支座负反力及优化主桁杆件受力,采用边墩支座顶升技术,并在边墩附近部分主桁杆件及桥面系设置压重混凝土。边跨及三角区钢桁梁采用支架拼装工艺施工,中跨采用悬臂拼装工艺施工。
The main bridge of Sanguantang Bridge in Ningbo is a continuous steel truss girder bridge with a main span of 465 m and two side spans of 160 m.The main-span and side-span decks measure 45.9 m and 37.9 m wide,respectively.The superstructure consists of two lateral N-shaped trusses that are spaced at 33.7 m along bridge width and measure 14.5 m high at midspan,42.0 m at central piers and 15.0 m at side piers.A typical truss panel is 15.0 m long,the panels near the tops of central piers is 18.75 m long.The members of the trusses are all of box cross-section with plate stiffeners.The upper lateral bracings are arranged in diamond manner,while the lower lateral bracings at V struts are distributed in K manner,and the members of the lateral bracings are either of box cross-section or H cross-section.The orthotropic steel deck and the main trusses carry loads together.To address the reaction forces of bearings on side piers and optimize the load bearing behaviors of main truss members,the bearings on side piers are jacked up,and counterweights are distributed at the main truss members and deck near the side piers.The steel trusses in side spans and triangle zones were assembled on scaffolds,while the steel trusses in the central span were assembled in cantilever manner.
作者
常付平
马骉
姜洋
CHANG Fu-ping;MA Biao;JIANG Yang(Shanghai Municipal Engineering Design Institute(Group)Co.,Ltd.,Shanghai 200092,China;Shanghai Engineering Research Center of High Performance Composite Bridges,Shanghai 200092,China)
出处
《世界桥梁》
北大核心
2022年第3期8-13,共6页
World Bridges
关键词
连续梁桥
钢桁梁
正交异性钢桥面板
板桁结合
顶升
压重
悬臂拼装
结构设计
continuous girder bridge
steel truss
orthotropic steel deck
combined orthotropic steel deck and truss
jack-up
counterweight
cantilever assembly
structural design
