桥隧过渡段实腹式RC拱桥上无缝线路纵向力分布特征  

Continuously welded rail track longitudinal forces distribution characteristics of solid web reinforced concrete arch bridge of bridge-tunnel connection section

作　　者：于向东[1] 李毓坤 闫斌[1] YU Xiangdong;LI Yukun;YAN Bin(School of Civil Engineering,Central South University,Changsha 410075,China;Hunan Provincial Communications Planning,Survey&Design Institute Co.,Ltd,Changsha 410008,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]湖南省交通规划勘察设计院有限公司,湖南长沙410008

出　　处：《铁道科学与工程学报》2018年第12期3066-3072,共7页Journal of Railway Science and Engineering

基　　金：国家重点研发计划资助项目(2017YFB1201204)

摘　　要：以西成高铁52 m实腹式RC拱桥为例,建立考虑CRTS I型双块式无砟轨道结构的钢轨-道床板-实腹式钢筋混凝土拱桥三维实体模型,研究其无缝线路纵向力分布特征;在此基础上,探讨隧道的遮挡作用下钢轨、道床板的纵向温差对无缝线路纵向力的影响;以及长期收缩徐变作用下主拱圈分层施工对桥上无缝线路纵向力的影响。研究结果表明:拱桥伸缩力最大值出现在跨中,且数值较大,为主要控制性荷载;桥梁两端隧道遮挡作用对钢轨应力影响明显,不同道床板纵向温差条件下,钢轨应力增幅为1.0%～5.5%,钢轨纵向位移最大增幅14.8%;钢轨纵向温差条件下,钢轨应力与纵向位移较大,设计时应予以重视;考虑混凝土10 a收缩徐变的影响,主拱圈分层施工与一次浇筑相比,钢轨压应力减小20.6%,钢轨纵向位移减小14.9%。A rail-slab-solid web RC arch bridge finite element model was established under the background of a 52m solid web reinforced concrete arch bridge with CRTS I double-block ballastless track of high-speed railway from Xi’an to Chengdu.Longitudinal forces of ballastless track was analyzed.On this foundation,longitudinal force of continuously welded rail track which was created by temperature variations of rail and slab due to tunnel shield was explored.And the influence of shrinkage and creep of the longitudinal force of rail in different construction methods of arch ring was discussed.The results show that the maximum value of the expansion force appears in the mid-span,and the value is large,which is the dominant load.Tunnel shield has remarkable influence on rail stress.Under the temperature variations of slab,the rail stress increases 1.0%-5.5%,and the maximum longitudinal displacement of the rail increases 14.8%.Rail stress and longitudinal displacement under the temperature variations of rail are heavy,which should be taken into account in design.Considering the influence of shrinkage and creep of concrete for 10 years,constructing layer by layer can reduce the rail compressive stress by 20.6%and the longitudinal displacement of the rail by 14.9%compared with one-time pouring.

关 键 词：实腹式拱桥 无缝线路 钢轨纵向力 桥隧过渡段 收缩徐变 

分 类 号：U213.912[交通运输工程—道路与铁道工程]