欢迎来到天天文库
浏览记录
ID:36639913
大小:356.06 KB
页数:5页
时间:2019-05-13
《考虑轨道约束的高速铁路简支梁碰撞效应研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、桥梁建设2014年第44卷第6期(总第229期)24BridgeConstruction,Vo1.44,No.6,2014(TotallyNo.229)文章编号:1003—4722(2014)06—0024—05考虑轨道约束的高速铁路简支梁碰撞效应研究闰斌,戴公连,粟淼(中南大学土木工程学院,湖南长沙410075)摘要:为研究轨道结构对简支梁桥碰撞效应的影响规律,以沪昆线上某4—32m简支箱梁为例,采用大质量法分析地震动的行波效应,用Kelvin单元分析桥梁碰撞,用非线性杆单元模拟梁轨接触,建立了考虑滑动支座摩阻力、桥墩弯矩曲率非线性和桩土共同作用的梁轨系统动力有限元模型,分析了一致激励和行
2、波效应下考虑轨道约束的高速铁路简支梁桥碰撞效应,并对梁缝宽度、线路纵向阻力等设计参数进行了敏感性分析。结果表明:轨道结构对桥梁纵向位移起到了约束作用,可减弱甚至消除梁体间的碰撞效应;适当增加梁缝宽度,可大幅度减小梁体碰撞次数和撞击力线路纵向阻力减弱时(如采用小阻力扣件时),梁体间的碰撞效应增强。关键词:铁路桥;简支梁桥;地震激励;桥梁碰撞;无缝线路;非线性分析中图分类号:U213.9;U448.13文献标志码:AStudyofPoundingEffectofHigh·-SpeedRailwaySimply。_SupportedBeamBridgeConsideringTrackConstra
3、intYANBin,DAIGong—lian,SUMiao(SchoolofCivilEngineering,CentralSouthUniversity,Changsha410075,China)Abstract:Tostudythelawofimpactofthetrackstructureonthepoundingeffectofthehigh—speedrailwaysimply—supportedbeambridge,a4-32mspansimplysupportedboxbeambridgeonShanghai—KunmingHigh—SpeedRailwaywascitedas
4、anexample,theeffectofthegroundmotiontravelingwaveswasanalyzed,usingthelargemassmethod,thepoundingofthebridgebeamswasanalyzed,usingtheKelvinelementandthecontactbetweenthebeamandtrackwassimulated,usingthenonlinearlinkelement.Thedynamicfiniteelementmodelforthebeamandtracksystemconsideringthefrictional
5、resistanceoftheslidebearings,thepiermomentcur—vaturenonlinearityandthepile~soilinteractionwasestablished,thepoundingeffectofthesire—ply—supportedbeambridgeconsideringthebeamandtrackconstraintundertheuniformearth——quakeexcitationandtravelingwaveeffectwasanalyzedandthesensitivityanalysisofthedesignpa
6、rameterslikethebeamgapwidthandrailwaylinelongitudinalresistancewasmadeaswel1.Theresultsoftheanalysisshowthatthetrackstructureplaystheroleinconstrainingthelongitu—dinaldisplacementofthebridgeandcanweakenoreveneliminatethepoundingeffectbetweenthebeams.Theproperincreaseofthebeamgapwidthcangreatlyreduc
7、ethepoundingfrequenciesandpoundingforcesofthebeamsandwhenthelongitudinalresistanceoftherailwaylineweakens(e.g.thelittleresistantfastenersareused),thepoundingeffectbetweenthebeamsshouldbeenhanced.Keywords:ra
此文档下载收益归作者所有