?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Rocking+Damage-Free+Steel+Column+Base+with+Friction+Devices%3A+Design%2C+Numerical+and+Experimental+Evaluation&rft.creator=Freddi%2C+F&rft.creator=Dimopoulos%2C+C&rft.creator=Karavasilis%2C+T&rft.description=Conventional+seismic-resistant+structures%2C+such+as+steel+moment+resisting+frames%2C+are+designed+to+experience%0D%0Asignificant+inelastic+deformations+under+strong+earthquakes.+Inelastic+deformations+result+in+damage+of+structural%0D%0Amembers+and+residual+interstory+drifts%2C+which+lead+to+high+repair+costs+and+disruption+of+the+building+use+or%0D%0Aoccupation.+The+aforementioned+socio-economic+risks+highlight+the+need+for+widespread+implementation+of+minimaldamage+structures%2C+which+can+reduce+both+repair+costs+and+downtime.+Examples+of+such+structures+include+steel%0D%0Aframes+equipped+with+self-centering+beam-column+connections%2C+structural+fuses%2C+passive+energy+dissipation+devices%2C%0D%0Aself-centering+braces%2C+and+others.+These+earthquake-resilient+steel+frame+typologies+have+been+extensively+studied%0D%0Aduring+the+last+decade+but+little+attention+has+been+paid+to+the+behavior+of+their+column+bases.+Conventional+steel%0D%0Acolumn+bases+are+susceptible+to+experience+non-repairable+damage+significantly+affecting+the+resilience+of+the+entire%0D%0Astructure.+The+present+paper+presents+an+innovative+rocking+damage-free+self-centering+steel+column+base+and%0D%0Asummarize+the+results+of+the+analytical%2C+numerical+and+experimental+studies.+The+proposed+column+base+uses+posttensioned+high+strength+steel+bars+and+friction+devices+respectively+to+control+the+rocking+behavior+and+to+dissipate%0D%0Athe+seismic+energy.+The+moment-rotation+behaviors+of+the+proposed+column+base+can+be+easily+described+by+using%0D%0Asimple+analytical+equations+allowing+the+definition+of+a+design+procedure+for+the+calibration+of+the+main+design%0D%0Aparameters+with+the+aim+of+achieving+the+damage-free+behavior%2C+the+self-centering+capability+and+an+adequate+energy%0D%0Adissipation+capacity.+A+three-dimensional+non-linear+finite+element+model+of+the+column+base+was+developed+in%0D%0AABAQUS+in+order+to+investigate+the+local+behavior+of+the+components%2C+to+validate+the+moment-rotation+analytical%0D%0Aequations+and+to+demonstrate+the+efficiency+of+the+design+procedure.+On+the+other+hand%2C+a+simplified+model+for+the%0D%0Acolumn+base+was+developed+in+OpenSees+and+allow+to+investigate+the+effects+of+the+proposed+column+base+on+a+case%0D%0Astudy+building.+Nonlinear+dynamic+analyses+show+that+the+rocking+column+base+fully+protects+the+first+story+columns%0D%0Afrom+yielding+and+eliminate+the+1%0D%0Ast+story+residual+story+drift+without+any+detrimental+effect+on+peak+story+drifts.+In%0D%0Aaddition%2C+an+experimental+campaign+under+monotonic+and+cyclic+load+protocols+allows+to+calibrate+the+numerical%0D%0Amodels+and+further+confirms+the+damage-free+behavior+and+the+high+potentials+of+the+proposed+column+base+to+be%0D%0Aused+in+the+design+of+highly+resilient+steel+structures.&rft.subject=Damage-free+column+base%3B+rocking%3B+steel+frames%3B+seismic+design%3B+resilience.&rft.publisher=ANIDIS&rft.date=2019-09-19&rft.type=Proceedings+paper&rft.publisher=XVIII+National+Conference+ANIDIS%2C+L'Ingegneria+sismica+in+Italia&rft.language=eng&rft.source=+++++In%3A++XVIII+National+Conference+ANIDIS%2C+L'Ingegneria+sismica+in+Italia+Proceedings.++++ANIDIS%3A+Ascoli+Piceno%2C+Italy.+(2019)+++++&rft.format=text&rft.identifier=https%3A%2F%2Fdiscovery.ucl.ac.uk%2Fid%2Feprint%2F10087625%2F1%2FFreddi%2520et%2520al.%25202019_ANIDIS_2019_Paper%2520CB_v3.pdf&rft.identifier=https%3A%2F%2Fdiscovery.ucl.ac.uk%2Fid%2Feprint%2F10087625%2F&rft.rights=open