大跨度双线铁路钢桁梁斜拉桥受力特性-研究

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1、／^■WABSTRACTHanjiatYangtzeRiverRailwayBridgeisadoubletower,five-spancontinuoussteeltrusscable—stayedbridgewithspanarrangement(8l+135+432十135+82)m．Thebridgeallowstwolinesrailway．Orthotropicmonolithicsteeldeckisadopted，whichworkstogetherwiththemaintruss．Sofar,cable-stayedbridgeshaveseld

2、ombeenappliedinrailwaybridges．Thereisnorailwaycable—stayedbridgewithspanaslongasHanjiatYangtzeRiverRailwayBridgeathomeandabroad．ThemechanicalbehaviorofthebridgeWasstudiedinthisPaper．MainworkofthisParperisasfollows：1．SpacejfiniteelementmodelofthefullbridgeWasestablishedadoptingSPB(Spac

3、ePlate—Beam)method．Themechanicalcharacteristicsofthebridgeunderdeadload，worst．caseoflivingloadandadditionalforceswerestudied．Theresultsshowthattheworkingconditionofthebridgeisreasonableandthestiffnessandstrengthmeettherequirements．2．Theeffectsofthebreakjointsinconcreteslabwerestudied．

4、Theresultsshowthatthebreakiointsoftheconcreteslababovecrossbeamsatchordjoints，caneffectivelydecreasethepeaktensilestressoftheconcreteslabnearbythebreakioints，buttheyhavenoeffectonthestressoftheconcreteslab0．5mawayfromthebreakjointsandthesteelstructure．3．Thereasonablypouringsequencefor

5、theconcreteslabwasstudied．Theresultsshowthat，thepouringsequenceofconcreteslabmainlyaffectstheself-weightstressoftheconcreteslab．Thetensilestressofthemiddlemidspanareaislargest．Therefore，thereasonablypouringsequenceiStopourtheconcretslabinthisareaat1ast．SOthattheself-weightoftheconcret

6、eslabwouldnotcreattensilestressinthisarea．4．Theeffectsoftheconcreteslabonthebridgestiffnessandmechanicalbehaviorwerestudied．Theresultsshowthat．theconcreteslabcallincreasetheverticalstiffnessandthelateralstiffnessofthebridgeby1．8％and7．5％respectively,effectivelydecreasethestressoftheste

7、eldecks，butlittlechangethestressofthemaintrusses．Withthethicknessandwidthoftheconcreteslabincreased．thelateralstiffnessofthebridgeincreasedandstressofsteeldecksincreased，whileverticalstiffnessandstressofmaintrusseschangedlittle．TheresearchresultsinthispapernotonlyservicedesignofHanjia

8、tYang