大跨度公铁两用斜拉桥板桁主梁受力特性研究

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1、桥梁建设2014年第44卷第6期(总第229期)46BridgeConstruction，Vo1．44，No．6，2014(TotallyNo．229)文章编号：1003—4722(2O14)06—0046—06大跨度公铁两用斜拉桥板桁主梁受力特性研究秦竞熙，张明金。，李永乐(1．加州大学洛杉矶分校土木与环境工程系，美国加利福尼亚州洛杉矶90024；2．西南交通大学桥梁工程系，四川I成都610031)摘要：为研究大跨度公铁两用斜拉桥板桁主梁整体受力性能和铁路桥面系局部受力性能，以(84+196+532+l96+84)m平潭海峡公铁两用大桥主桥为背景进

2、行分析。采用ANSYS建立全桥和不同节段长度主梁的三维板桁结构精细化有限元模型，对板桁主梁的整体刚度和桥面板局部刚度进行计算，并对比分析铁路桥面系构件参数(板桁连接方式、桥面板厚度、横梁刚度、纵梁及U肋厚度)对主梁刚度的影响。分析结果表明，板桁主梁中横梁位置处钢轨的竖向线刚度较大，两横梁之间竖向线刚度较小，钢轨的竖向线刚度沿纵向周期性波动。铁路桥面板厚度对桥梁整体扭转刚度影响明显，铁路桥面板局部刚度与横梁、纵梁和U肋密切相关。关键词：斜拉桥；公路铁路两用桥；板桁主梁；正交异性板；刚度；参数分析；有限元法中图分类号：U448．27；U443．35文献标

3、志码：AStudyofMechanicalCharacteristicsofPlateandTrussMainGirderofLongSpanRail··cam·-RoadCable--StayedBridgeQINJing-xi，ZHANGMing-jin。，LJYong—le(1．DepartmentofCivilandEnvironmentalEngineering，UniversityofCalifornia，LosAngeles，LOSAngeles90024，USA；2．DepartmentofBridgeEngineering，Sout

4、hwestJiaotongUniversity，Chengdu610031，China)Abstract：Tostudytheglobalmechanicalbehavioroftheplateandtrussmaingirderandthelocalmechanicalbehavioroftherailwayfloorsystemoflongspanrail—-cure——roadcable—stayedbridge，themainbridgeofthePingtanStraitRail—cure—RoadBridgewithspanarrange

5、ment(84+196+532+196+84)mwascitedasanexampleandwasanalyzed．TheANSYSwasusedtoes—tablishtherefinedthree—dimensionalplateandtrussfiniteelementmodelsforthewholebridgeandforthemaingirderofdifferentsegmentlength，theglobalstiffnessoftheplateandtrussmaingirderandthelocalstiffnessofthede

6、ckplateswerecalculatedandtheinfluencesofthecomponentparameters(theplateandtrussconnection，deckplatethickness，crossbeamstiffnessandstringerandUribthickness)oftherailwayfloorsystemonthestiffnessofthemaingirderwerecomparativelyanalyzed．Theresultsoftheanalysisdemonstratethatthevert

7、icallinearstiff—nessoftherailsatthemiddlecrossbeamoftheplateandtrussmaingirderisgreat，theverticallinearstiffnessinbetweenthetWOcrossbeamsiSlittleandtheverticallinearstiffnessoftherailscyclicallyfluctuatesalongthelongitudinaldirection．Theinfluencesoftherailwaydeckplatethicknesso

8、ntheglobaltorsionalstiffnessofthebridgearesignificanta