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1、重慶大學(xué)碩士學(xué)位論文II英文摘要ABSTRACTSteel-concretemixedstructurecouldtakefulladvantageoftheexcellentcharacterofsteelandconcrete.Now,thisnewstructuretypehasbeendevelopedrapidlyandwidelyusedinChina.Howeever,itisashorttimethatthisstructuretypedevelopedinourcountry,sotheylacktheoppor
2、tunitytoundergoearthquake.Howtoensureitsapplicationsafetyinhigh-intensityareahasbecomeanurgentproblemwaitingtobesolved.Inordertoachievetheperformancetargetof“NoCollapsingintheStrongEarthquake”,guidingthefailuremechanismofstructurereasonablywhichcontributestoimprovingi
3、tsseismicperformancesduringsevereormegaearthquake.Asabasicstructuretype,steel-concretemixedframethatconsistsofcompositecolumnandsteelbeamorcompositebeamiswidelyappliedinotherstructuresystems.TheexistingdesigncodeshaveyettoprovidespecificstipulationsconcerningtheWeakBe
4、am-strongColumnmechanismofmixedframe.Furthermore,thecurrentstudyaimedatthisproblemisquiterare.Basedontheoreticalanalysisandnumericalsimulation,theWeakBeam-strongColumnmechanismofsteel-concretemixedframestructureisstudied.Themainachievementsofthisdissertationareasfollo
5、ws:①Thefibermodelandsolidelementmodelareestablishedtosimulatetheelastic-plasticmodelofcompositemembersandbothofthemareprovedtobeapplicable.Alsoneglectingthebond-slipattheinterfacebetweensteelpipeandcoreconcretehaslittleimpactoncalculations.Thisconclusionalsoprovidesev
6、idenceforassumptionofstraincompatibilityinthefibermodel.②Pushoveranalysiswiththreecommonlateralloadpatternsandnonlineartime-historyanalysisofmixedframestructurewithsteelbeamandconcretefilledcircularsteeltubularcolumnareperformed.Theirresultsarecomparedfromglobalrespon
7、ses(suchasthemaximumroofdisplacementandinter-storydriftratio)andlocalresponses(suchastheplastichingedistributionandthecurvatureductility).Itisindicatedthatthepushoveranalysismethodwithfirstmodelateralloadpatternisapplicable.③Themainparametersthatinfluencefailuremechan
8、ismofmixedframestructurearestudied.Theeffectsofultimatemomentratio(columntobeam)andlinestiffnessratioonthefailuremodeofmixed
