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Experimental validation of replaceable shear links for eccentrically braced steel frames / Nabil Mansour in Journal of structural engineering, Vol. 137 N° 10 (Octobre 2011) 

Public ISBD [article]  in Journal of structural engineering > Vol. 137 N° 10 (Octobre 2011) . - pp. 1141-1152 Titre : Experimental validation of replaceable shear links for eccentrically braced steel frames Type de document : texte imprimé Auteurs : Nabil Mansour, Auteur ; Christopoulos, Constantin, Auteur ; Robert Tremblay, Auteur Année de publication : 2012 Article en page(s) : pp. 1141-1152 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Aftershocks  Eccentrically  braced  steel  frames  Shear  link  Bolted  connection  Replaceable  link  Inelastic  rotations  Bearing Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : In the current design of steel eccentrically braced frames (EBFs), the yielding link is coupled with the floor beam. This often results in oversized link elements, which leads to overdesigned structures and foundations. In addition, the beams are expected to sustain significant damage through repeated inelastic deformations under design-level earthquakes, and thus the structure may require extensive repair or replacement. These drawbacks can be mitigated by designing EBFs with replaceable shear links. Two different replaceable link types with alternate section profiles, connection configurations, welding details, and intermediate stiffener spacings were tested. A total of 13 cyclic quasi-static full-scale cyclic tests were performed, including tests on EBFs with replaceable shear links, to study their inelastic seismic performance. The links exhibited a very good ductile behavior, developing stable and repeatable yielding. Additional inelastic rotation capacity can be achieved with bolted replaceable links when bolt bearing deformations are allowed to occur. The on-site replaceability of the link sections is confirmed even in the presence of residual deformations of 0.5% drift. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i10/p1141_s1?isAuthorized=no [article] Experimental validation of replaceable shear links for eccentrically braced steel frames [texte imprimé] / Nabil Mansour, Auteur ; Christopoulos, Constantin, Auteur ; Robert Tremblay, Auteur . - 2012 . - pp. 1141-1152. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 137 N° 10 (Octobre 2011) . - pp. 1141-1152 Mots-clés : Aftershocks  Eccentrically  braced  steel  frames  Shear  link  Bolted  connection  Replaceable  link  Inelastic  rotations  Bearing Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : In the current design of steel eccentrically braced frames (EBFs), the yielding link is coupled with the floor beam. This often results in oversized link elements, which leads to overdesigned structures and foundations. In addition, the beams are expected to sustain significant damage through repeated inelastic deformations under design-level earthquakes, and thus the structure may require extensive repair or replacement. These drawbacks can be mitigated by designing EBFs with replaceable shear links. Two different replaceable link types with alternate section profiles, connection configurations, welding details, and intermediate stiffener spacings were tested. A total of 13 cyclic quasi-static full-scale cyclic tests were performed, including tests on EBFs with replaceable shear links, to study their inelastic seismic performance. The links exhibited a very good ductile behavior, developing stable and repeatable yielding. Additional inelastic rotation capacity can be achieved with bolted replaceable links when bolt bearing deformations are allowed to occur. The on-site replaceability of the link sections is confirmed even in the presence of residual deformations of 0.5% drift. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i10/p1141_s1?isAuthorized=no

Seismic design and performance of steel moment-resisting frames with nonlinear replaceable links / Yunlu Shen in Journal of structural engineering, Vol. 137 N° 10 (Octobre 2011) 

Public ISBD [article]  in Journal of structural engineering > Vol. 137 N° 10 (Octobre 2011) . - pp. 1107-1117 Titre : Seismic design and performance of steel moment-resisting frames with nonlinear replaceable links Type de document : texte imprimé Auteurs : Yunlu Shen, Auteur ; Christopoulos, Constantin, Auteur ; Nabil Mansour, Auteur Année de publication : 2012 Article en page(s) : pp. 1107-1117 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Seismic  design  Bolted  connection  Replaceable  link  Steel  frame  MRF,  Cyclic  testing  FE  model Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Although moment resisting frames (MRFs) designed according to the latest seismic codes can provide life safety during a design level earthquake, they are expected to sustain significant damage at flexural yielding locations in the beams. The design of the beams for strength and drift control considerations are also interlinked, often resulting in overdesign of other elements, such as diaphragms and foundations. These drawbacks can be mitigated by introducing replaceable links at the locations of expected inelastic action. A five-story prototype MRF building with replaceable links in a high-seismic zone was designed. Four full-scale beam-to-column subassemblages representing the first floor exterior connections in the prototype building were experimentally evaluated. The results demonstrated that MRFs with replaceable flexural links can provide strength and ductility equivalent to existing MRFs while minimizing the effect of the added links on the elastic stiffness of the system. Finite-element models were then developed to capture the observed experimental responses, including local buckling, bolt slipping, and bolt bearing. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i10/p1107_s1?isAuthorized=no [article] Seismic design and performance of steel moment-resisting frames with nonlinear replaceable links [texte imprimé] / Yunlu Shen, Auteur ; Christopoulos, Constantin, Auteur ; Nabil Mansour, Auteur . - 2012 . - pp. 1107-1117. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 137 N° 10 (Octobre 2011) . - pp. 1107-1117 Mots-clés : Seismic  design  Bolted  connection  Replaceable  link  Steel  frame  MRF,  Cyclic  testing  FE  model Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Although moment resisting frames (MRFs) designed according to the latest seismic codes can provide life safety during a design level earthquake, they are expected to sustain significant damage at flexural yielding locations in the beams. The design of the beams for strength and drift control considerations are also interlinked, often resulting in overdesign of other elements, such as diaphragms and foundations. These drawbacks can be mitigated by introducing replaceable links at the locations of expected inelastic action. A five-story prototype MRF building with replaceable links in a high-seismic zone was designed. Four full-scale beam-to-column subassemblages representing the first floor exterior connections in the prototype building were experimentally evaluated. The results demonstrated that MRFs with replaceable flexural links can provide strength and ductility equivalent to existing MRFs while minimizing the effect of the added links on the elastic stiffness of the system. Finite-element models were then developed to capture the observed experimental responses, including local buckling, bolt slipping, and bolt bearing. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i10/p1107_s1?isAuthorized=no