主跨588 m非对称矮塔公铁两用斜拉桥设计研究

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英文篇名：Research on Design of Asymmetric Short-Pylon Rail-cum-Road Cable-Stayed Bridge with 588 m Main Span 作者：易伦雄 英文作者：YI Lun-xiong;China Railway Major Bridge Reconnaissance & Design Institute Co.,Ltd.; 关键词：公路铁路两用桥 ; 非对称矮塔斜拉桥 ; 钢梁 ; 箱-桁组合结构 ; 强箱弱桁 ; 2 ; 000 ; MPa斜拉索 ; 设置沉井基础 英文关键词：rail-cum-road bridge;;asymmetric short-pylon cable-stayed bridge;;steel girder;;box-truss composite structure;;strong box girder and weak truss;;2 000 MPa stay cables;;setting type open caisson foundation 中文刊名：桥梁建设 英文刊名：Bridge Construction 机构：中铁大桥勘测设计院集团有限公司; 出版日期：2019-08-28 出版单位：桥梁建设 年：2019 期：04 语种：中文; 页：67-71 页数：5 CN：42-1191/U ISSN：1003-4722 分类号：U448.27

摘要

商合杭铁路芜湖长江公铁大桥受建设条件限制,主桥设计为主跨588m的非对称矮塔斜拉桥。主梁采用双层桥面箱—桁组合结构钢梁,下层铁路桥面为钢箱结构,上层公路桥面为密横梁体系的正交异性钢桥面板结构。该主梁结构具有强箱弱桁的受力特性,解决了该桥塔矮、索平以及主梁水平轴力大的问题。斜拉索采用抗拉强度2 000MPa的高强度锌铝合金镀层平行钢丝拉索,以承受高达1.5×10~4 kN的斜拉索轴力。将斜拉索锚固于主梁下弦,使斜拉索获得相对较大的倾角从而提高结构体系刚度。芜湖侧桥塔墩基础采用平面尺寸为65m×35m的大型设置沉井基础,克服了该侧桥塔墩基础深水、裸岩的困难建设条件。
        Restricted by the construction conditions,the main bridge of Wuhu Changjiang River Rail-cum-Road Bridge on Shangqiu-Hefei-Hangzhou railway is designed as an asymmetric shortpylon cable-stayed bridge having a main span of 588 m.A box-truss composite structure with double decks is used in the main girder.A steel box girder is applied for the lower-layer railway deck,while an orthotropic steel deck structure with dense crossbeam is applied for the upper-layer highway deck.This type of main girder,which possesses the characteristics of strong box girder and weak truss,is favourable for solving the prolems caused by short pylons,small-angle stay cables and giant axis force of the main girder.Parallel steel wire stay cables coated with Zn-Al alloy with 2 000 MPa high strength are used to bear the axis force of cables which is up to 1.5×104 kN.Stay cables are anchored in the lower deck to increase the angles which can improve the rigidity of the whole structure.Moreover,large-scale setting type open caisson foundation which has a plane size of 65 m×35 mis used in the pylon foundation of Wuhu side to overcome the difficult construction conditions caused by deepwater and exposed bedrock.

引文

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