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1、51Seismicresponseofr.c.columnswithsmoothreinforcement.PartII:Cyclictests ReviewArticleEngineeringStructures,Volume30,Issue9,September2008,Pages2289-2300GerardoMarioVerderame,GiovanniFabbrocino,GaetanoManfredi Closepreview
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6、ReferencesReferencesAbstractEvaluationofrotationcapacityofreinforcedconcrete(r.c.)membersisakeyissueintheseismicperformancesevaluationoftheexistingbuildings.Intheframeworkofthemodernsafetyassessmentprocedures,ac
7、omparisonbetweenaseismicdemand(D)andseismiccapacity(C)measureisrequired.However,availablecapacitymodelsreflectexperimentalresultsrepresentativeofnewconstructions,wheredeformedbarsareused.Consequently,deformationandstrengthmechanismsdonotnecessarilyreflectresponseofold
8、-typemembers.Itiswellknownthatr.c.membersdesignedaccordingtoobsoletecodesofpracticearecharacterisedbyverydifferentstructuraldetailing,inadequateconfinement,poorbondbetweensmoothbarsandconcrete,sothatverydifferentpost-yieldingmechanismscomparedtonewconstructionstakepla
9、ce.ThisisthebackgroundofthepresentpaperthatreportstheresultsofthesecondphaseoftheexperimentalprogramcarriedoutonreinforcedcolumnswithsmoothrebarsdesignedaccordingtoguidelinesavailableinItalybetween1940and1970.Resultsonspecimenssubjectedtocyclicloadingclearlypointoutth
10、eroleofpoorbondinthedevelopmentofrotationcapacityandingeneralonthelocalandglobalresponseofmembers.Relevantaspectsoftheresearcharediscussedwithreferencetothemonotonicresponseofcolumnsanalysedinacompanionpaperandtochordrotationgivenbyempiricalformulae,i.e.Eurocode8provi
11、sions.Purchase$31.50ArticleOutline1.Introduction2.Experimentalprogramandsetup3.Testresultsanddiscussion3.1.ColumnstypeC-270A3.2.ColumnstypeC-270B3.3.ColumnsTypeC-540A3.4.ColumnstypeC-540B4.Resultsintermsoflocaldeformation5.Testresultsintermsofenergydissipation6.Someco
12、mparativeremarks7.ConclusionsReferences52Welfareoftheminipigwithspecialreferencetouseinregulatorytoxicologystudies Original