大跨度梁桁组合结构节点区受力特性分析

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1、西南交通大学硕士研究生学位论文第1l页AbstractThecompositetruss．beamstructureisonethatissomehownew,anditisprovidedwitheasymaintaining，reasonablecostandhighcarryingcapacity．Thereisplentyofthisbridgebeingbuiltonforeigncountries，thusthestudyofitisstillinthestageofdevelopmentinOu

2、rcountry．Withthedevelopmentofthestructuredesigntheoryandtheconstructiontechnology,thestudyofthisstructureiswildlycarryingoninOurcountry．Forthejointofthisstructureisthecriticalregionthatguaranteesthetrussandbeamworkingconsistently．Thestudyofthejointgradually

3、becomesarepresentativesubjectofsuchstructure．Thisthesisreviewedthedevelopmentandstatedthecurrentsituationofbeam—trusscompositestructureinforeigncountriesanddomestic．Andthestressdistribution，theforcetransmissionmodeandtheload．displacementcurveofthejointhasbe

4、encalculatedbyANSYS．Thefiniteelementmodelincludingnonlinearcontactofthejointwassetuptostudythestressandthestrainoftherealjointprecisely．Thenthispaperanalyzedtheoutcomingsofthefiniteelementanalysiswhichindicatedthestressandstraindistributionsdisciplineandthe

5、load．displacementcurveofthejoint．Thejointmodelthatisscaledbythewayofequalcarryingcapacitywasexecuted．Theresultofthemodeltestshowsthattheiointisstillintactafterexerted600tonit；theload-displacementcurveremainanobliquestraightlinethatmeansthejointisstillinthes

6、tageofelastic．Afterwards，analysisofthetworesultsiscarriedout，whichshowsthatthesetworesultsmeeteachotherwell．Accordingtotheanalysis，thePBLiseffectiveandreliable．Theentirenodehashighstiffness，highcarryingcapacityandgoodcrackresistance，whichshowthatjointconstr

7、uctionisreasonableandmeetsthedesignrequirementsoftruss—beamcompositestructureintheaspectofreliability,security．Meanwhilethisarticleaccumulatessomedataandexperiencesformetruss—beamcompositestructureespeciallythejoint．Keywords：beam．trusscompositestructure；joi

8、nt；finiteelementmethod；contactanalysis；modeltest西南交通大学硕士研究生学位论文第

9、ll页目录第一章绪论⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯11．1研究背景⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯11．2课题研究意义⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯21．3桁梁组合结构发展概况及研究现状⋯⋯