100m简支钢桁梁桥无缝线路伸缩力影响因素研究  

Research on the Influence Factors of Expansion and Contraction Force of CWR on 100 m Simply Supported Steel Truss Bridge

作　　者：徐浩[1] 林红松[1] 田春香[1] 蔡文锋[1] XU Hao;LIN Hongsong;TIAN Chunxiang;CAI Wenfeng(China Railway Eryuan Engineering Group Co.Ltd,Chengdu,Sichuan 610031,China)

机构地区：[1]中铁二院工程集团有限责任公司,成都610031

出　　处：《铁道工程学报》2022年第2期46-51,共6页Journal of Railway Engineering Society

基　　金：中国科协青年人才托举工程项目(2019QNRC001);中铁二院科技开发计划(KYY2019032(19-22));中铁二院科技开发计划(KYY2017055(17-20))。

摘　　要：研究目的:某客货共线铁路上多跨100 m简支钢桁桥上采用无砟轨道无缝线路,为研究100 m简支钢桁梁桥无缝线路伸缩力及其影响因素,建立线-桥-墩一体化空间有限元模型,研究桥梁跨数、简支钢桁梁桥墩纵向水平刚度、线路阻力布置方式和桥梁支座布置方式等设计参数对无缝线路伸缩力的影响规律。研究结论:(1)钢轨伸缩力随简支钢桁梁跨数的增加而增大,对于多跨100 m简支钢桁梁桥,可只取8跨进行计算;(2)随着简支钢桁梁桥墩纵向水平刚度的增大,钢轨伸缩力和简支钢桁梁墩台力均随之增大,从减小钢轨伸缩力和墩台受力的角度考虑,简支钢桁梁桥墩纵向水平刚度不宜过大;(3)在简支钢桁梁范围内布置小阻力扣件可减小52.95%的钢轨伸缩力;(4)为减小钢轨伸缩力和简支钢桁梁墩台力,相邻混凝土简支箱梁与简支钢桁梁宜采用相同方向的支座布置方式;(5)相关研究成果可为大跨简支钢桁梁上无缝线路设计提供借鉴和参考。Research purposes:Ballastless track continuous welded rails(CWR)is used on 100 m simply supported steel truss bridge of a mixed passenger and freight railway.In order to study the expansion and contraction force and influence factors of CWR on 100 m simply supported steel truss bridge,a track-bridge-piers spatial finite element model is established,and the influence of design parameters such as number of bridge spans,the longitudinal stiffness of the pier,the layout of track resistance and bridge support on the expansion and contraction force of CWR are researched.Research conclusions:(1)The rail expansion and contraction force increases with the increase of simply supported steel truss spans.For a multi-span 100 m simply supported steel truss bridge,only 8 spans can be taken for calculation.(2)With the increase of longitudinal stiffness of simply supported steel truss pier,both rail expansion and contraction force and pier force of simply supported steel truss bridge increase.In order to reduce the rail expansion and contraction force and pier force,the longitudinal stiffness of simply supported steel truss should not be too large.(3)The rail expansion and contraction force could be reduced by 52.95%after small resistance fasteners laid on the simply supported steel truss.(4)In order to reduce the rail expansion and contraction force and pier force of simply supported steel truss,the adjacent simply supported concrete box girder and simply supported steel truss should adopt the support arrangement in the same direction.(5)The research results can provide references for the design of continuous welded rail on large-span simply supported steel truss bridge.

关 键 词：简支钢桁梁 无缝线路 有限元模型 伸缩力 设计参数 

分 类 号：U213.91[交通运输工程—道路与铁道工程]