钢桁架——混凝土结合梁受力性能分析

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1、西南交通大学硕士研究生学位论文第1I页AbstractThesteeltruss--voncretecompositebeamiSanewkindofcompositestructure，inwhichtheconcretedeckslabandthesteelco-acttogther，hascomeintowidlyuseinhigh-speedrailwaybyEuropean，AmericancountriesandJapanbecauseithasSOmanyadvantagessuchasbigstiffness，lowbuildingheight，goodinteg

2、rity，slightnoisesandwelldynamicbehaviorintraindriving．Alongwiththespeedupoftheexistingrailwayandtherapidconstructionofhigh-speedrailwaythistypebridgemustbewidlyusedinChinatoo．Sothisthesispropsosestostudythestructuralbehaviorofsteeltruss-concretecompositebeam，itissignificant．TlliSthesisintrodu

3、cestheapplicationandcurrentresearchofthesteeltruss-concretecompositebeamathomeandabroad，steeltrussformandcharacteristics，typeofshearconnectorsandbearingcapacitycalculationmethodofthestud，thedifferentcombingconditionofconcreteslabwithstringerandfloorbcamofsteeltruss．Inordertostudythestructural

4、behaviorofthethroughmulti-crossbeamfloorsystemsimply-supportedsteeltruss-concretebeam，theauthorusesofsparefiniteelementcalculationanalysisforaproposed108mspan．Themaincontentsarefollows：1．Reasearchthestructuralbehaviorofthestructure，theaxialforcedistributionbetweenthelOWerboomandthedeck，thes仃e

5、ssdistributionofconcretebridgepanelunder2nd-stagedeadloadandliveloadincludingdouble-tracksymmetrylive10ads．andthenaturalvibrationcharacteristicsofthestructure．2．Reasearchthedisplacementconditionofthe10adsideandunloadsidelOWerboom，thesheardistributionbetweenthetwonodesofthefloorbeam，thetorsion

6、ofthemainsteeltrussunderthesingle-trackliveload．3．Reasearchthe10adstructurestressconditionanditSdistributionoftheconcretebridgedeckunderthreedifferenttemperatureloadwhichcanreflecttheconditionofsuddencooling，sunshineinfluenceandtemperaturegradient．4．Thedegreeofshearconnectionandthestiffnessof

7、floorbeamhavegreateffectonthestressofthesteeltruss-concretecompositebeam，thisthesisalsomadesomestudyonlowerboomdisplacementofthesteeltruss，internalforcesandthestressdistributionofconcretebridgedeckunderdouble-tracksymmetryliveloadswithdiffere