客运专线桥上纵连式无砟道岔伸缩力与位移影响因素分析.pdf

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1、第33卷第2期铁道学报Vol_33No．22011年2月JOURNALOFTHECHINARAILWAYSOCIETYFebruary2011文章编号：1001—8360(2011)02—0079—07客运专线桥上纵连式无砟道岔伸缩力与位移影响因素分析任娟娟，王平，刘学毅(西南交通大学高速铁路线路工程教育部重点实验室，四川I成都610031)摘要：以武广客运专线雷大特大桥铺设CRTsⅡ型纵连式无砟道岔为例，将一组客专18号渡线、CRTS1I型板式无砟轨道、桥梁、墩台视为一个系统，建立了岔一板一梁一墩一体化计算模

2、型，分析了道岔、道床板、桥墩的受力和变形规律，以及道床板伸缩刚度、滑动层摩擦系数、固结机构等对各部分变形的影响。分析结果表明：基本轨伸缩附加力和纵向位移随道床板纵向伸缩刚度的减少而越大，道岔传力部件受力随道床板伸缩刚度减小而明显减小；滑动层失效不会对轨道结构的变形造成较大影响，但对墩台和固结机构受力不利；大跨桥上有必要设置固结机构，取消固结机构对基本轨位移变化及桥梁墩台受力不利。关键词：桥上无缝道岔；纵连式无砟轨道；伸缩力；纵向位移中图分类号：U213文献标志码：Adoi：10．3969／j．issn．1001

3、—8360．20l1．O2．013InfluencingFactorsofTemperatureForceandDisplacementofL0ngitudinallyCoupledBallastlessWeldedTurnoutonBridgesofDedicatedPassengerLinesRENJuan—juan，WANGPing，LIUXue—yi(MOEKeyLaboratoryofHigh-speedRailwayEngineering，SouthwestJiaotongUniversity，Ch

4、engdu610031，China)Abstract：TakingthelongitudinallycoupledballastlessturnoutontheLeidaBridgeoftheDedicatedWuhan-GuangzhouPassengerLineforinstance，theintegralfiniteelementmodelofturnout(crossover)一trackslab-bridge-pierwasestablished，inwhichtWONo．18weldedturnou

5、tswithmovablefrogintheformofcrossover，longitudinallycoupledCRTSⅡballastlesstrack，bridgesandpierswereregardedasonesystem．Lawsofadditionaltemperatureforcesanddeformationofturnouts，trackslab，bridgesandpierswereanalyzedonthebasisthemode1．Besides，parametersofinfl

6、uenceondifferentPartsofde—formationwereresearched，suchastheexpansionstiffnessoftrackslab，frictioncoefficientofthesliplayerandfixingoftheanchorpoint．Calculationresultsshowasfollows：additionallongitudinalforcesanddisplacementofstockrailsduetotern—peraturechang

7、esincreasewiththereductionoflongitudinalslabexpansionstiffness，whereastheforcesoftransmissioncomponentsofturnontssuchasposition-limiteddevicesandspacerblocks，decreaseremarkablywiththereductionoflongitudinalslabexpansionstiffness．Thefrictioncoefficientofthesl

8、iplayerhasnogreatinfluenceonlongitudinaldistortionsofthetrackstructure，butitisunfavorableforstressedcharacteristicsofpiersandfixings．ItiSnecessarytoarrangeanchorpointsonlarge-spanbridgesbecauset