ThesteelConcentricBracedFrame(CBF)isapopularstructuraltypeforbuildingsinseismicareas.Infact,itcanconvenientlyprovidethebuildingwithlargestrengthandstiffness.Furthermore,thesimplicityoffabricationthatderivesfromtheuseofshearconnectionsbetweenbeamsandcolumnsappealstostructuraldesigners.Unfortunately,thedissipationcapacityofsteelbracesislimitedandthestructuraltypeislowredundantandthuspronetostoreycollapsemechanisms.ToimprovetheseismicperformanceoftheCBFdouble-stageBRBs(DYBs)couldbeusedinsteadofconventionalsteelbraces.TheDYBexhibitshighdissipativeandstablecyclicresponseand,ifinsertedintoasteelframe,promotethespreadofdamageowingtotheshapeofitshysteresisloop.Despiteitsqualities,inliteraturetherearenodesignmethodsthatallowitsuse.Hence,inthispaper,adesignmethodforsteelframeswithDYBsisformulatedincompliancewiththeprinciplesoftheEuropeanseismiccode.ThebehaviourfactorqiscalibratedtomeettheperformanceobjectivesofEurocode8.Theca-librationisperformedbynonlineardynamicanalysisconductedwithOpenSeeson75frameswithdifferentfeatures.ThenumericalmodeliscalibratedontheresultsoftheexperimentaltestsperformedbyPanandhisco-workersatTsinghuaUniversityinBeijing(China).ThededucedresultsconfirmtheeffectivenessoftheframewithDYBs,whichcanbedesignedwithqvaluesgreaterthanthoseusedfortraditionalsteelbracedframes

Achieving a more effective concentric braced frame by the double-stage yield BRB

Francesca Barbagallo;Melina Bosco;Edoardo Michele Marino;Pier Paolo Rossi
2019

Abstract

ThesteelConcentricBracedFrame(CBF)isapopularstructuraltypeforbuildingsinseismicareas.Infact,itcanconvenientlyprovidethebuildingwithlargestrengthandstiffness.Furthermore,thesimplicityoffabricationthatderivesfromtheuseofshearconnectionsbetweenbeamsandcolumnsappealstostructuraldesigners.Unfortunately,thedissipationcapacityofsteelbracesislimitedandthestructuraltypeislowredundantandthuspronetostoreycollapsemechanisms.ToimprovetheseismicperformanceoftheCBFdouble-stageBRBs(DYBs)couldbeusedinsteadofconventionalsteelbraces.TheDYBexhibitshighdissipativeandstablecyclicresponseand,ifinsertedintoasteelframe,promotethespreadofdamageowingtotheshapeofitshysteresisloop.Despiteitsqualities,inliteraturetherearenodesignmethodsthatallowitsuse.Hence,inthispaper,adesignmethodforsteelframeswithDYBsisformulatedincompliancewiththeprinciplesoftheEuropeanseismiccode.ThebehaviourfactorqiscalibratedtomeettheperformanceobjectivesofEurocode8.Theca-librationisperformedbynonlineardynamicanalysisconductedwithOpenSeeson75frameswithdifferentfeatures.ThenumericalmodeliscalibratedontheresultsoftheexperimentaltestsperformedbyPanandhisco-workersatTsinghuaUniversityinBeijing(China).ThededucedresultsconfirmtheeffectivenessoftheframewithDYBs,whichcanbedesignedwithqvaluesgreaterthanthoseusedfortraditionalsteelbracedframes
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.11769/362105
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