大跨连续刚构桥收缩徐变与温度效应对车桥系统耦合振动振动的影响

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1、西南交通大学硕士研究生学位论文第1I页AbstractWiththeacceleratingdevelopmentofChinesehi曲-speedrailway,thelong-spancontinuousrigidflamebridgeisverywidelyusedbyitsconvenientconstruction，strongspanningabilityandfavorablesmooth-goingoftheline．Alongwiththeincreasingofthespeedo

2、ftrain，itraisesahigllstandardforthesmooth-goingoftheline，while，thedeformationofthebridgecausedbycreep—shrinkageandtemperatureeffect，maydeterioratethecomfortableandrunningsafetyinhi曲-speedrailway．Therefore，itisimportantandmeaningfultomakesomecorrespondin

3、gresearch．Thethesistakesa88m+168m+88mcontinuousrigidframebridgeasanexample．Basedonvehicle-track-bridgecouplingvibrationtheory,takingtheeffectofcreep-shrinkageandtemperatureintoaccount，thevehicle—track-bridgecouplingvibrationisanalyzedinthisarticlewithBD

4、APV2．0(bridgedynamicanalysisprogram)．Themainconclusionsareasfollows：(1)Consideringtheinfluenceofcreep—shrinkageortemperatureeffect，thereislittlechangeinthedynamicdisplacementandaccelerationofbridge，therateofwheelloadreduction．verticalaccelerationandSper

5、lingvalueincreaseindifferentdegreeS．Theresultshowthatthesafetyindexandthevehicleverticaldynamicresponseincreasedastheincrementofdeformation．(2)Whenthemostdisadvantageousconditionofcreep-shrinkageandtemperatureeffectsaretakenintoaccount．themaximumrateofw

6、heelloadreductionincreaseby14．3％whilethemaximumgrowthoftheverticalaccelerationofvehicleiSl0．7％．Theresultshowthatthecreep-shrinkageandtemperatureeffectmayhaveadverseeffectsintheanalysisofvehicle·track—bridgecoupledsystem．(3)nledeckdeformationcausedbycree

7、pandtemperaturechangesbelongstoverticallong—waveirregularity,affectsgreatlyinvehicleverticalcomfortwhenthetrainistravelingatahi曲speedwhilethelateralaccelerationandlateralSperlingvaluechangealittleinthiscondition．Theresearchresultsaresignificanttothetheo

8、reticalresearchandpracticalapplicationsforlong—spancontinuousrigidframebridge．Keywords：vehicle—track—bridgecoupledvibration，creep·shrinkage，temperatureeffect，continuousrigidflamebridge西南交通大学硕士研究生学位论文第1Il页目录第1章绪论⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯