扣件失效下轨道-箱梁结构振动特性试验研究

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关键词：扣件失效；动力响应；缩尺模型；加速度导纳 中图分类号： U213.2+42 文献标志码：A DOI：10.16385/j.cnki.issn.1004-4523.202310052

Experimental study on vibration characteristics of track-box girder structurewithfastenerfailure

LUO Kun ⋅1，2 ， CHEN Peng1，²， ZHEN Huijie1²，WANG Wei1²， JIANG Xing² （1.Engineering Research Center of Railway Environmental Vibration and Noise，Ministry of Education， East China Jiaotong University，Nanchang 330ol3，China;2.State KeyLaboratory of Performance Monitoring Protecting of Rail Transit Infrastructure，East China Jiaotong University，Nanchang 33OOl3，China; 3.Liuzhou RailwayVocational and Technical College，Liuzhou 545616，China）

Abstract：Tostudytheinfluenceofthevibrationcharacteristicsofbalastlesstrackonbridgeunderthefailedfasteners，thisthsis adoptsnexistingscalemodelofballstlesstrack-box girderstructure.Undertherandomloading，theinfluenceofdiferentinvalid fastenersconditionsonthevibrationresponsechangeofthetrack-boxgirderstructureisdiscused.Theresultsshowthatthepeak valueofacelerationadmitanceincreasesandthepeak frequencyofadmitancemoves forward whenthefastenerfails，itappears in eachcomponentofthemidspansectionof track-box girderstructure，especiallappearsintherailand track plate.Atthesame time，itisfoundthatwhenthedistacebetweenthefilurefasteneandteobseedsectionisdierent，thevibationsposeef fectoftherail-boxgirdercomponentsisalsodiferent.Whenthedistancebetweentheflurefastenerandtheobservedsectionwithinonefastenerspacing，theaccelerationadmitanceofeachcomponentofthetrack-boxgiderincreasessignificantly，withhepeak valueatte track plate increasingby1.48times.Whenthedistance between thefailurefastenerand theobserved sectionismore than three fastener spacings，the acceleration response increase of each component of the box beam is within 5% . In addition， it is foundthatthedynamicresponseofvarious components ofthetrack-box girder structureisdirectlyproportional tothe numberof failedfasteners.Forexample，thepeakacelerationadmitaneofthe threefsteners withcontiuousfailureatthetrackplate is1.9 timeshigherthanthatwithoutfailureoffasteners.Themaximumincreaseofpeakadmitanceatthetopplateandwingplate is （204号 131% and 82% respectively，while the increase of peak admitance at the web plate and botom plate of the box girder is approximately less than 25% ：

Keywords：fastener failure;dynamicresponse;scale model;acceleration admittance

扣件作为高速铁路轨道结构中的重要连接部件，具有保持轨道几何形位和降低轨道振动的作用[1-3]，然而在车辆荷载反复作用下，扣件常常出现不同程度损伤，并致使钢轨支撑刚度不均、轮轨间的相互作用力增大等现象，严重影响高速列车运行的安全性与平稳性[45]。（剩余9507字）