建筑结构抗震设计原理与实例 第七章

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1、BasicConceptSEISMICSTEELDESIGNINCANADASeismicDesignPhilosophyImpracticaltodesignastructuretowithstandseismicforceinelasticrangeAllowthestructuregointotheinelasticdeformationtoabsorbenergySimplification:comeupwithRfactordesignapproach(EngineersonlyInstructor:needtodoela

2、sticanalysiswithanDr.CarlosE.Ventura,P.Eng.assumedRvalue)DeterminethestaticforceusingDepartmentofCivilEngineeringNBCC05andtheductilityTheUniversityofBritishColumbiarequirementbyCSA-S16CANADAe-mail:ventura@civil.ubc.ca17/12/20082IntroductionNewforcereductionfactorsinthe20

3、05NBCCThisoverviewisbasedontheParameters:Ductility-relatedforcemodificationOverstrength-relatedforceprovisionscontainedin:V:Designshearforce.factor(Rd):modificationfactor(Ro):The2005EditionoftheNationalS(Ta):DesignspectralresponseThisfactorcorrespondstotheRThisfactor

4、isrelatedtotheBuildingCodeofCanada.acceleration.factorusedintheprevious1995calibrationfactorUusedintheClause27ofthe8th.EditionoftheM:Factorforthehighermodeedition.previouscode.vHandbookofSteelConstruction.effectsontheshearbase.Forsteelstructures,thesehaveIttakesintoac

5、countinamorebeenincreasedforductileandexplicitwaytheoverstrengthinIE:Earthquakeimportancefactorofthestructure.moderatelyductilesystemsto3.5structures,byidentifyingthesourcesand5.0,comparedto3.0and4.0inofitandassigningfactorsthatSTMIWW:Expectedweightofthestructure.avEt

6、hepreviouscode.considereachofthesesources,likeVRd:Ductility-relatedforcetheactualstrengthofthematerial,RRThedesignforcesforthesesystemsdomodificationfactor.arenowlower;however,thedetailsroundingupofdimensionsoftheRo:Overstrength-relatedforcerequirementstoensureadequat

7、eelements,andredistributionofLateralseismicforceatthemodificationfactor.ductilityaccordingtothesefactorsinternalforces.baseaccordingtothe2005aremoredemanding.NBCC17/12/2008317/12/20084Steelseismicforceresistingsystems(SFRS)CharacteristicsofSFRS:ClassificationofSFRSaccordi

8、ngtothereductilebehavior:The2005NBCCrecognizesdifferenttypesofSFRS,theircorrespondingDuctileor