软土地区铁路既有线动力响应测试与提速列车—路基动力作用特性分析

《软土地区铁路既有线动力响应测试与提速列车—路基动力作用特性分析》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、上海交通大学硕士学位论文ABSTRACTfrequencydomainwerefound,andaccelerationesponsecharacterisiticsoftrackandthesurfaceofsubgradebedinthezoneofbridge-subgradetransitionwereobtained.(2)Onthebasisoflarge-scaleinfiniteelementanalysisplatformofABAQUS,dynamicanalysismodeloftran

2、ditionalsubgradeunderthetestconditionswasbuild.usingthetestdataofaccelerationofsurfaceofsubgradebedassystemexcitationtosimulatethetrainloads,thedynamicresponsesofsubgradebeforeraisingthespeedoflinewereobtainthroughnumericalcomputation.Intermsofacceleration,

3、theresultoftestwasinaccordwiththeoreticalresult,andeffectivenessoftheproposedanalysismodelwasvalidated.(3)Accordingtotheloadverticaltransferpattern,twomethodstosimulatetrainloadswereproposedinthispaper:movingloadsanddynamicloadsfunctionintimedomain.Underthe

4、conditionthatthesimulatedresultbeforeraisingspeedwasinaccordwiththemeasuredvalue,theinfluencesondynamicresponsecharacterisicsoftranditionalsubgradeduetoraisingthespeedoftrainswerestudied.Thepaperproposedtwodynamicanalysisindicatorsoftheinfluentialdepthofdyn

5、amicstressandadditionalsettlementunderdynamicaction,andsummarizedtheircharacteristicschangedwiththegrowthofspeed.(4)Three-dimensionaldynamicanalysismodelsoffiniteelementofsubgrade-feildandtrack-foundationinzoonofbridge-subgradetransitionwerebulid.Usingthemo

6、vingloadstosimulatetrainloads,theimpactsondynamicstressanddeformationofsubgradeinzoneoftransitionandthetrackvibrationwerestudiedandevaluated.Thechangescharacterisicsoftrackvibrationinbridge-subgradetransitionwithlongitudinaldistanceanddifferentialsettlement

7、betweenbridgeandsubgradechangingwasstudied.KEYWORDS:exsitingrailway,subgrade,raisingspeed，dynamicrespone,dynamicfiniteelment,bridge-subgradetransition—IV—万方数据上海交通大学硕士学位论文目录目录第一章绪论..............................................................................

8、..............................11.1研究背景及研究意义....................................................................................11.2国内外研究现状...............................................................