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,whichcanbedesignedwithqvaluesgreaterthanthoseusedfortraditionalsteelbracedframesI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
