梯形轨枕对轨道交通高架桥梁减振作用分析.pdf

《梯形轨枕对轨道交通高架桥梁减振作用分析.pdf》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。

1、中文摘要摘要:随着轨道交通系统的快速发展，运行列车引起的环境振动问题受到人们的关注。国内外学者研究了各种措施进行减振。浮置式梯形轨枕轨道是其中的一种。首先，本文综述了我国城市轨道交通发展现状和环境振动研究历程，介绍了浮置式梯形轨枕轨道的结构特点。其次，通过建立列车一高架桥梁相互作用分析模型，计算了铺设梯形轨枕和普通整体道床两种情况下高架桥梁的动力响应，分析了梯形轨枕对高架桥梁的减振作用。最后，对梯形轨枕轨道进行了室内试验研究。通过室内加载试验，进一步了解梯形轨枕的减振性能。在梯形轨枕上部施加动荷载，振动从钢轨传到轨道底座以后，振动强度大幅度降低。理论分析和试验表明，梯形轨枕

2、具有良好的减振效果。梯形轨枕和普通整体道床相比，减振效果主要体现在桥梁竖向加速度上，对桥梁竖向位移影响很小，对桥梁的横向动力响应和车辆的动力响应几乎没有影响。列车运行速度越高，梯形轨枕的减振效果越明显;梯形轨枕减振垫的弹性系数越小，减振效果越明显。关键词:轨道交通;高架桥梁;环境振动;梯形轨枕;车桥系统;减振措施分类号:U448+13ABSTRACTABSTRACT:Withtherapiddevelopmentofrailtransitsystem,theenvironmentalvibrationsinducedbyrunningtrainshavebroughttot

3、heatentionsofpeople.ResearchersinChinaandabroadhavestudiedallkindsofreductionmeasures.Floatingladdertrackisoneofthem.Firstly,inthispaper,thecurrentdevelopmentofcityrailtransitandtheresearchhistoryofenvironmentvibrationaresummarized.Thestructurecharacteristicsoffloatingladdertrackareintrodu

4、ced.Secondly,byestablishingananalysismodeloftrain-bridgeinteractionsystem,thedynamicresponsesofviaductbridgewithladdertrackandthedynamicresponsesofviaductbridgewithordinarynon-ballastedtrackarecalculated.Thentheladdertrack'sefectonreducingvibrationofviaductbridgeisanalyzed.Lastly,theladder

5、trackisstudiedbylaboratoryexperiment.Thecharacteristicsoftheladdertrackarewellunderstoodthroughalaboratoryexperiment.Whendynamicloadisloadedonthetopoftheladdertrack,山evibrationtransmitsfromtherailtothetrackbaseandthevibrationintensityatenuatesclearlyinthecourseoftransmission.Theoreticalana

6、lysisandexperimentprovesthatladdertrackhasgoodvibrationreductioncharacteristic.Ascomparedtoordinarynon-ballastedtrack,laddertrack'svibrationreductionefectismainlyembodiedinverticalaccelerationofbridge,whilethatefectonverticaldisplacementofbridgeisverysmall.Laddertrackhashardlyanyefectonlat

7、eraldynamicresponseofbridgeanddynamicresponseoftrain.Thehigherthetrainspeedis,themoreobvioustheladdertrack'svibrationreductionefectis;由。smallerthematelasticityofladdertrackis,themoreobvioustheladdertrack'svibrationreductionefectis.KEYWORDS:railtransit;viaductb