地铁大跨度连续钢桁桥减振垫无砟轨道动力分析  

Dynamic Analysis of Ballastless Track with Damping Pad for Metro Long-span Continuous Steel Truss Bridge

作　　者：肖治群[1] Xiao Zhiqun(China Railway Siyuan Survey and Design Group Co.Ltd,Wuhan 430063,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《科技通报》2022年第4期75-80,86,共7页Bulletin of Science and Technology

摘　　要：为了研究地铁大跨度连续钢桁桥上铺设减振垫无砟轨道的适用性,并进行相关轨道参数的选型优化设计,基于列车-轨道-桥梁动力相互作用理论,建立地铁列车-无砟轨道-钢桁桥耦合动力学模型,以研究该车轨桥系统的动态特性,分析内容包括钢桁桥预拱度设置、无砟轨道对桥梁的减振效果分析、无砟轨道道床板与桥面间的变形协调分析等。研究表明:(1)桥梁预拱度对列车动态特性的影响并不大。(2)通过适当减小无砟轨道减振垫的刚度,可以有效降低钢桁桥的振动。(3)在地铁列车的动荷载作用下,无砟轨道与钢桁桥之间的变形存在不协调性。当列车在边跨上运行时,其导致的无砟轨道道床板与桥面间的变形更加不协调。(4)随着板长的增大,道床板和桥面之间的最大相对压缩量在逐渐降低,道床板的弯曲变形越大,而短板结构则表现出更多的整体变形。In order to study the applicability of laying damping pads ballastless tracks on the long-span continuous steel truss bridge of the subway,and to carry out the selection and optimization design of relevant track parameters,based on the train-track-bridge dynamic interaction theory,a subway train-ballastless track-steel truss bridge coupled dynamics model was established to study the dynamic characteristics of the train-track-bridge system.The analysis content includes the pre-camber setting of the steel truss bridge and the ballastless track,the analysis of the vibration damping effect of the bridge,the analysis of the deformation coordination between the ballastless track bed slab and the bridge deck,etc.The research shows that:(1)The pre-camber of the bridge has little effect on the dynamic characteristics of the train.(2)By appropriately reducing the stiffness of the ballastless track cushion,the vibration of the steel truss bridge can be effectively reduced(3)Under the dynamic load of the subway train,there is incompatibility in the deformation between the ballastless track and the steel truss bridge.When the train runs on the side span,the deformation between the ballastless track bed slab and the bridge deck is even more inconsistent.(4)As the length of the slab increases,the maximum relative compression between the track bed slab and the bridge deck gradually decreases.The bending deformation of the track bed slab increases,while the short slab structure shows more overall deformation.

关 键 词：地铁 大跨度连续钢桁桥 减振垫 无砟轨道 车-轨-桥耦合动力系统 

分 类 号：U213􀆰[交通运输工程—道路与铁道工程]