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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