山区铁路不对称连续钢桁梁柔性拱桥主梁设计  

Design of Asymmetric Continuous Steel Truss Girder with Flexible Arch in Mountainous Area

作　　者：房帅平[1] FANG Shuaiping(China Railway First Survey and Design Institute Group Co.Ltd,Xi’an,Shaanxi 710043,China)

机构地区：[1]中铁第一勘察设计院集团有限公司,西安710043

出　　处：《铁道工程学报》2024年第8期67-73,共7页Journal of Railway Engineering Society

基　　金：中国铁建股份有限公司科研项目(2019-B15);中铁第一勘察设计院集团有限公司科研项目(院科20-12)。

摘　　要：研究目的:钢桁梁柔性拱桥普遍为对称结构,但对于山区铁路桥梁,需要考虑桥址地形、地质条件、建造条件及抗震性能等多种因素。本文以山区铁路某跨越V形深沟桥梁为研究背景,针对地形陡峭、施工空间狭小、施工难度大的特点,提出一种非对称钢桁梁柔性拱桥式方案,为山区铁路桥梁选型拓宽思路。研究结论:(1)采用(216+144)m不对称连续钢桁梁柔性拱桥方案,适用于桥址处的建设条件;(2)通过建立有限元模型,对本桥进行静力和动力计算分析,表明本桥结构刚度、杆件强度等各项力学性能均可满足规范的要求;(3)桥面系采用纵横梁桥面体系,纵梁上设置道砟槽板,减轻了桥面系自重,解决了桥面系后期维修和更换的难题;(4)本桥采用塔架扣索施工方案,解决了悬拼过程主桁架应力及变形过大的难题;(5)本桥形式新颖、结构合理、造型美观、节省材料,对山区地形桥梁设计具有借鉴意义。Research purposes:Steel truss flexible arch bridges are generally symmetrical structures,but for railway bridges in mountainous areas,many factors such as site topography,geological conditions,construction conditions and seismic performance should be considered.Based on the research background of a bridge spanning a deep V-shaped ditch in mountain railway,this paper proposes an asymmetric steel truss flexible arch bridge scheme for the steep terrain,narrow construction space and difficult construction,to broaden the idea for the selection of railway bridges in mountainous areas.Research conclusions:(1)The scheme of(216+144)m asymmetric continuous steel truss flexible arch bridge is adopted,which is suitable for the construction conditions of the bridge site.(2)Through the finite element model,the static and dynamic calculation analysis of the bridge shows that the mechanical properties of the bridge,such as structural stiffness and member strength,can meet the requirements of the relevant codes.(3)The bridge deck system adopts the longitudinal and horizontal beam,and the ballast trough plate is set on the longitudinal beam,which not only reduces the dead weight of the bridge deck,but also solves the problem of maintenance and replacement in the later period of the bridge deck.(4)The bridge adopts the construction scheme of tower and cable,which solves the problem of excessive stress and deformation of the main truss in the process of suspension.(5)The bridge has the advantages of novel form,reasonable structure,beautiful shape and efficient material.It has reference significance for the design of bridge in mountainous terrain.

关 键 词：铁路桥梁 钢桁梁 柔性拱 连续钢桁梁柔性拱桥 桥梁设计 道砟槽板 悬拼施工 

分 类 号：U24[交通运输工程—道路与铁道工程]