Behaviour of asymmetric building systems under a monotonic load—II

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1、ELSEVIEREngineeringStructures,Vol.18,No.2,pp.133-141,1996Copyright©1995ElsevierScienceLtdPrintedinGreatBritain.Allrightsreserved0141-0296(95)00073-90141-0296/96$15.00+0.00Behaviourofasymmetricbuildingsystemsunderamonotonicload—IA.FerhiandK.Z.TrumanDepartmentofCivilEnginee

2、ring,WashingtonUniversity,StLouis,MO63130,USA(ReceivedMay1994;revisedversionacceptedOctober1994)Buildingssubjectedtoalargeintensitygroundmotiondeformwellintotheinelasticrange.Inparticularasymmetricbuildingsundergocoupledinelasticlateralandtorsionaldeformationsthatcouldbet

3、hegoverningfactorsintheirdesign.Therelationshipbetweenthesystem'sasymmetryanditsinelasticdeformationsisyettobedetermined.Thisstudydefinestheasymmetricbuildingsystemanditskeycomponentsnamelythestiffnessandstrengtheccentricities.Thesolutionismathematicallyformulatedanditsa

4、ccuracyisdiscussed.Selectedexamplesarepresentedinordertoshowthecharacteristicsoftheinelasticbehaviourofanasymmetricbuildingsystemandhowitisaffectedbythestiffnessandstrengtheccentricities.rwoasymmetricbuildingmodelsareused.Onemodelislaterallysupportedonwall-columnelements

5、whichprovideresistanceinoneprincipaldirection.Thesecondmodelislaterallysupportedoncolumnswhichprovideresistanceinbothprincipaldirectionsmakingbiaxialbendingeffectssignificant.Forsimplicity,theanalyticalmodelsareamonosymmetricone-bay,one-storeyframe;thelateralloadresist

6、ingelementsarereplacedbynonlinearsprings;andtheloadingisamonotonicstaticloadappliedatthecentreofmass.Keywords:asymmetricbuildings,inelasticbehaviour,lateral-torsionalcoupling,stiffnesseccentricity,strengtheccentricity,biaxialbending1331331.IntroductionItwouldbeidealifallb

7、uildingshadtneirlateral-loadresistingelementssymmetricallyarrangedandearthquakegroundmotionswouldstrikeinknowndirections.Butmostbuildingshavesomedegreeorirregularityinthegeometricconfigurationorthedistributionofmass,stiffness,and/orstrengthandearthquakes;donotstrikeinapre

8、determineddirection.Duetooneormoreoftheseirregularities,thestructure’slateralresistancetothegrou