钢—混凝土混合框架结构强柱弱梁破坏机制分析

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1、重庆大学硕士学位论文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