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1、TSINGHUASCIENCEANDTECHNOLOGYISSN1007-021403/15pp640-647Volume11,Number6,December2006PassiveControlReinforcedConcreteFrameMechanismwithHighStrengthReinforcementsandItsPotentialBenefits*AgainstEarthquakes**AsadUllahQazi,YELieping(叶列平),LUXinzheng(陆新征)KeyLaboratoryofStructuralEngineeringandVib

2、rationofMinistryofEducation,DepartmentofCivilEngineering,TsinghuaUniversity,Beijing100084,ChinaAbstract:Severeearthquakescontinuetocausemajorcatastrophes.Manydevicesinactive,hybrid,andsemi-activestructuralcontrolsystemswhichareusedascontrollableforcedevicesarecostlytobuildandmaintain.Thepa

3、ssivecontrolreinforcedconcreteframe(PCRCF)reinforcedwithhighstrengthsteelonlyinthecolumnspresentedhereprovidesstructuralsystemsmoreresistancetolateralearthquakeloadingsatcomparativelylowercost.Theeffectivenessisdemonstratedbyanonlinearstaticanalysisusingfibermodelforasinglestorysinglebayfr

4、ame.Thestudyshowsthattheuseofhighperformancesteelincolumnspre-ventsformationofplastichingesatthecriticalcolumnbasesectionsandfailuresarealwaysinitiatedbyre-inforcementyieldingatthebeamends.Furthermore,afterexperiencingseverelateraldrift,thepassivecon-troldesignhassmallresidualdisplacements

5、comparedtoordinaryreinforcedconcreteframes.PCRCFre-habilitationandstrengtheningcanbeachievedmoreeasilyascomparedwithordinaryreinforcedconcreteframe.Keywords:earthquake;passivecontrol;highstrengthreinforcement;failuremechanism;residualdisplacementframesdesignedaccordingtothestrongcolumn/wea

6、kIntroductionbeamconceptareexpectedtoundergoinelasticdefor-mationsbyformingplastichingesinthebeams.TheInmostreinforcedconcrete(RC)structures,alargecolumnsaresupposedtoremainelastictomaintainstiffnessisneededinordertolimitstructuraldeforma-verticalloadcarryingcapacityandpreventpossibletionf

7、orserviceloadconditions.Inseismicresistantcollapse.Althoughtherequiredflexuralstrengthdif-structures,however,theenergydissipationdemandsferencebetweenbeamsandcolumnsatjointlocationsareimposedandinelasticdeformationsarepermittedenforcesthisidealframedeformation