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1、桥上纵连板式无砟轨道无缝道岔力学特性第45卷第5期2010年l0月西南交通大学JOURNALOFSOUTHWESTJIAOTONGUNIVERSITYVo1.45No.50ct.2Ol0文章编号:0258-2724(2010)05-0669-07DOI:l0.3969/j.issn.0258-2724.2010.05.003桥上纵连板式无砟轨道无缝道岔力学特性乔神路,高亮,曲村,辛涛(北京交通大学土木建筑工程学院,北京100044)摘要:为研究桥上纵连板式无砟轨道无缝道岔的力学特性,根据桥上纵连板式无砟轨
2、道无缝道岔的特点,采用有限元方法,建立桥上纵连板式无砟轨道无缝道岔的纵一横一垂向空问耦合计算模型.以铺设在桥上的客运专线l8号无砟轨道无缝单渡线为例,研究轨道板/底座板伸缩刚度,摩擦板长度,桥梁形式对桥上纵连板式无砟轨道无缝道岔力学特性的影响.结果表明:减小轨道板/底座板伸缩刚度,对轨道结构变形影响较小,但下部结构受力明显降低,最大降幅约为90%;增加摩擦板长度,有利于控制桥上无缝道岔的受力与变形,可减小下部结构受力,当摩擦板长度由50nl增至100ITI时,端刺受力可减小约18%;桥上纵连板式无砟轨道无
3、缝道岔宜铺设在连续梁上.关键词:桥上无缝道岔;纵连板式无砟轨道;力学特性;影响因素中图分类号:U213.6文献标识码:AMechanicalPropertiesofContinuous--Slab--TrackWeldedTurnoutonBridgeQIAOShenlu,GAOLiang,QUCun,XINTao(SchoolofCivilEngineering,BeijingJiaotongUniversity,Beijing100044,China)Abstract:Inordertostudyth
4、emechanicalpropertiesoflongitudinalconnectedballastlessweldedturnoutsonbridges,alongitudinal—transverse-verticalspatialcouplingmodelwasestablishedaccordingtothecharacteristicsoftheturnoutsusingfiniteelementmethod.TakingthesinglecrossoverofNo.18weldedturno
5、utforballastlesstracklaidonabridgeinpassengerdedicatedlineasanexample,theinfluencesofsomemainfactors,includingstiffnessoftrackplate/seatingplate,lengthoffrictionplate,andbridgetype,onthemechanicalpropertiesofthelongitudinalconnectedballastlessweldedturnou
6、tonbridgeswereanalyzed.Thecomputationalresultsshowthatthereductionofstiffnessoftrackplate/seatingplatehaslittleeffectontheforceanddeformationofthetrackstructure,butisfavorablefortheforceofsubstructure,withthelargestreductionofabout90%;lengtheningthefricti
7、onplateishelpfulforcontrollingtheforceanddeformationoftheturnout,andcanalsodecreasetheforceofsubstructure(forinstance,theforceactedontheendthornwasdecreasedbyabout18%whenthefrictionplatewaslengthenedfrom50to100m);andthelongitudinalconnectedballastlessweld
8、edturnoutshouldbelaidonthecontinuousbridge.Keywords:weldedturnoutonbridge;longitudinalconnectedballastlesstrack;mechanicalcharacteristics;affectedfactors收稿日期:基金项目:作者简介:2009..10..10国家自然科学基金资助项目(50878018);国家863计划资助项目(
