Design Expression for the In-Plane Shear Strength of rcm

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1、DesignExpressionfortheIn-PlaneShearStrengthofReinforcedConcreteMasonry12K.C.VoonandJ.M.Ingham,M.ASCEAbstract:AspectsrelatingtocodiÞcationofthein-planeshearstrengthofconcretemasonrywallswhensubjectedtoseismicloadingarepresentedinthispaper.Particularemphasisisplacedonamode

2、lthatiscapableofrepresentingtheinteractionbetweenßexuralductilityandmasonryshearstrengthtoaccountforthereductioninshearstrengthasductilitylevelincreases.Thesimplemethodproposedhereallowsthestrengthenhancementprovidedbyaxialcompressionloadtobeseparatedfromthemasonrycompon

3、entofshearstrengthandisconsideredtoresultfromstrutaction.Inaddition,minormodiÞcationsaremadetofacilitateadoptionofthemethodintheupdatedversionoftheNewZealandmasonrydesignstandard,NZS4230:2004.PredictionofshearstrengthfromNZS4230:2004andalternativemethodsarecomparedwithre

4、sultsfromawiderangeofmasonrywallstestsfailinginshear.ItwasestablishedthattheshearequationintheformerversionoftheNewZealandmasonrystandard
NZS4230:1990wasoverlyconservativeinitspredictionofmasonryshearstrength.ThecurrentNationalEarthquakeHazardsReductionProgram
NEHRPshe

5、arexpressionwasfoundtobecommendable,butitdoesnotaddressmasonryshearstrengthwithinplastichingeregions,thereforelimitingitsusewhendesigningmasonrystructuresinseismicregions.Finally,thenewshearequationimplementedinNZS4230:2004wasfoundtoprovidesigniÞcantlyimprovedshearstreng

6、thpredictionwithrespecttoitspredecessor,withaccuracyclosetothatresultedfromNEHRP.DOI:10.1061/
ASCE0733-9445
2007133:5
706CEDatabasesubjectheadings:Axialloads;Ductility;Masonry;Reinforcement;Shearstrength;Concrete,reinforced.Introductionßexuralyielding,usuallycharacter

7、izedbyrapidstrengthdegrada-tionsoonafterthemaximumstrengthisreached.Theseexperi-ReinforcedmasonrystructuresaretypicallyÒbox-likeÓwithshearmentalstudiessuccessfullydemonstratedthattheshearresistancewallpanelspotentiallysubjectedtosimultaneousgravityandofreinforcedmasonryw

8、allpanelscomesfrommechanismssimi-horizontalloads,resultinginoverturningmomentsduringseismiclartothoseob