摘要
京新上地桥的曲线混凝土主梁采用单点顶推法施工,顶推总重250 000 kN,顶推距离213 m,顶推过程最大悬臂长度63 m。钢导梁预埋于主梁前端,通过剪力连接件和混凝土箱梁连接成整体,以传递顶推过程中的弯矩和剪力。对钢-混凝土过渡段顶、底、腹板的连接件受力性能进行设计分析,并建立实体模型详细分析最不利工况下关键部位的局部应力,结果表明界面连接可靠,钢-混凝土过渡段变形协调、应力分布均匀,设计合理。
Single-point incremental launching method is employed to construct the curved concrete main girder of Shangdi Bridge on Beijing- Xinjiang Expressway. During the incremental launching construction, the total launching weight, distance and maximum cantilever length is respectively 25 000 t, 213 m and 63 m. In order to transfer bending moment and shear force, the steel launching nose is pre-embedded in the front end of the concrete main girder, and is integrally connected with the concrete box girder by shear connectors. For the steel-concrete transition section： mechanical performance of connectors at the top, bottom and web slabs are analyzed firstly; and then, local stress at key positions under the most unfavorable conditions are precisely analyzed by means of solid model. The analysis results show that： connection of the interface is reliable, deformation of the steel-concrete transition section is compatible, and stress distribution is uniform, which indicate that the design is reasonable.
出处
《铁道标准设计》
北大核心
2013年第4期46-50,共5页
Railway Standard Design
基金
住房和城乡建设部2010年科技开发计划项目(2010-K2-16)
关键词
公路桥
顶推
钢导梁
钢一混凝土过渡段
局部应力
设计分析
expressway bridge
incremental launching
steel launching nose
steel-concrete transition section
local stress
design analysis
