钢筋溷凝土短墙初始刚度- Effective Stiffness of Squat Structural Walls

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1、EffectiveStiffnessofSquatStructuralWalls12BingLiandWeizhengXiangAbstract:Reinforcedconcrete(RC)structuralwallsaretheprimarylateral-loadcarryingelementsinmanystructuresdesignedtoresistearthquakes.Areviewofthetechnicalliteratureshowsconsiderableuncertaintywithregardst

2、otheeffectivestiffnessofthesestructureswhensubjectedtoseismicexcitations,whichmanydesignpracticescurrentlydealwithbyemployingastiffnessreductionfactor.Inanattempttoobtainadditionalinformationregardingthestiffnessofthesestructures,ananalyticalapproach,combiningthefle

3、xureandshearcomponentsofdeformation,isproposedtoevaluatetheeffectivestiffnessoftheRCwallstested.Basedonthisproposedanalyticalapproach,acomprehensiveparametricstudycomprising180combinationswascarriedoutandasimpleequationforassessingeffectivestiffnessofRCsquatstructur

4、alwallsthenproposed,onthebasisoftheseparametriccasestudies.DOI:10.1061/(ASCE)ST.1943-541X.0000386.©2011AmericanSocietyofCivilEngineers.CEDatabasesubjectheadings:Walls;Stiffness;Reinforcedconcrete;Loadbearingcapacity;Earthquakeresistantstructures.Authorkeywords:RCsqu

5、atstructuralwalls;Stiffnesscharacteristic;Initialstiffness.Introductionontheaxialloadandreinforcementcontent.Thus,therecommen-dationsintheNZS3101designcode(NZS1995)forstiffnessThepast15yearshaveseenmajordevelopmentsinseismicdesignestimationareoversimplifiedandmaylea

6、dtoaninaccurateassess-provisions,withaparadigmshiftfromaforce-basedapproachtoamentofthewallstiffness.Toobtainamoreaccurateevaluationofdisplacement-basedone,andanincreaseinfocusonthedeforma-wallstiffnessasdeterminedfromthecurvatureatfirstyieldandthetioncharacteristic

7、sofstructures.Stiffnesspropertiesofreinforcedflexuralstrength,severalproposalsonhowstiffnessvaluescanbeconcrete(RC)wallstructurescanaffecttheestimationofthefun-morerealisticallyassessedhavebeenpresented(Priestleyanddamentalperiod,displacements,anddistributionsofinte

8、rnalforceKowalsky1998;Priestley1998;AdebarandIbrahim2002).How-responsebetweenwalls.Themagnitudeoftheeffectivestiffnessever,FenwickandBull(