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Cyclic testing and modeling of cold-formed steel special bolted moment frame connections / Chia-Ming Uang in Journal of structural engineering, Vol. 136 N° 8 (Août 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 8 (Août 2010) . - pp. 953-960 Titre : Cyclic testing and modeling of cold-formed steel special bolted moment frame connections Type de document : texte imprimé Auteurs : Chia-Ming Uang, Auteur ; Atsushi Sato, Auteur ; Jong-Kook Hong, Auteur Année de publication : 2011 Article en page(s) : pp. 953-960 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Cyclic  tests  Steel  frames  Cold-formed  steel  Slip  Bearings  Bolted  connections  Buckling  Mathematical  models Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : A cyclic testing of nine full-scale beam-to-column moment connection subassemblies was carried out to support the development of design provisions for a lateral load-resisting system in the AISI S110: Standard for Seismic Design of Cold-Formed Steel Structural Systems—Special Bolted Moment Frames. This type of one-story framing system features C-section beams connected to hollow structural section columns by bearing-type high-strength bolts and is commonly used in industrial platform construction. The test results showed that these specimens had an interstory drift capacity significantly larger than 0.04 rad. The cyclic behavior was characterized by a linear response, a slip range, and a significant hardening response due to bearing at bolt holes. The conventional strong column-weak beam design philosophy is not appropriate for this system. The inelastic action through the bolt slip and bearing in the connection is a ductile yielding mechanism. Beams and columns should be protected to remain elastic by the capacity design principles. Based on the concept of the instantaneous center of rotation of an eccentrically loaded bolt group, a model that can properly simulate the cyclic behavior of the bolted moment connection is presented. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i8/p953_s1?isAuthorized=no [article] Cyclic testing and modeling of cold-formed steel special bolted moment frame connections [texte imprimé] / Chia-Ming Uang, Auteur ; Atsushi Sato, Auteur ; Jong-Kook Hong, Auteur . - 2011 . - pp. 953-960. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 8 (Août 2010) . - pp. 953-960 Mots-clés : Cyclic  tests  Steel  frames  Cold-formed  steel  Slip  Bearings  Bolted  connections  Buckling  Mathematical  models Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : A cyclic testing of nine full-scale beam-to-column moment connection subassemblies was carried out to support the development of design provisions for a lateral load-resisting system in the AISI S110: Standard for Seismic Design of Cold-Formed Steel Structural Systems—Special Bolted Moment Frames. This type of one-story framing system features C-section beams connected to hollow structural section columns by bearing-type high-strength bolts and is commonly used in industrial platform construction. The test results showed that these specimens had an interstory drift capacity significantly larger than 0.04 rad. The cyclic behavior was characterized by a linear response, a slip range, and a significant hardening response due to bearing at bolt holes. The conventional strong column-weak beam design philosophy is not appropriate for this system. The inelastic action through the bolt slip and bearing in the connection is a ductile yielding mechanism. Beams and columns should be protected to remain elastic by the capacity design principles. Based on the concept of the instantaneous center of rotation of an eccentrically loaded bolt group, a model that can properly simulate the cyclic behavior of the bolted moment connection is presented. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i8/p953_s1?isAuthorized=no

Seismic performance factors for cold-formed steel special bolted moment frames / Atsushi Sato in Journal of structural engineering, Vol. 136 N° 8 (Août 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 8 (Août 2010) . - pp. 961-967 Titre : Seismic performance factors for cold-formed steel special bolted moment frames Type de document : texte imprimé Auteurs : Atsushi Sato, Auteur ; Chia-Ming Uang, Auteur Année de publication : 2011 Article en page(s) : pp. 961-967 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Steel  frames  Cold-formed  steel  Bolted  moment  connection  Seismic  performance  factors  Response  modification  coefficient  Deflection  amplification  factor  System  overstrength  factor Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The American Iron and Steel Institute (AISI) recently issued a standard on the seismic design of cold-formed steel special bolted moment frames (SBMF). It is expected that ductility is provided through bolt slippage and bearing in the moment connection region; both the beams and columns are to be designed based on the capacity design principles. This paper provides background information for the proposed seismic performance factors. Based on cyclic testing results, a value of 3.5 was proposed for the response modification coefficient, R. A statistical evaluation through nonlinear time-history analysis, which considered the unique structural characteristics of this framing system, showed that the Newmark-Hall ductility reduction rule is conservative. Based on the analysis results, a revised rule was proposed, which resulted in a deflection amplification factor, Cd, of R/1.2( ≈ 3.0). A design procedure in the AISI seismic standard allows the designer to directly calculate the maximum seismic force in the moment connection at the design story drift level, thereby an empirical system overstrength factor, Ω0, is unnecessary for the design of SBMFs. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i8/p961_s1?isAuthorized=no [article] Seismic performance factors for cold-formed steel special bolted moment frames [texte imprimé] / Atsushi Sato, Auteur ; Chia-Ming Uang, Auteur . - 2011 . - pp. 961-967. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 8 (Août 2010) . - pp. 961-967 Mots-clés : Steel  frames  Cold-formed  steel  Bolted  moment  connection  Seismic  performance  factors  Response  modification  coefficient  Deflection  amplification  factor  System  overstrength  factor Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The American Iron and Steel Institute (AISI) recently issued a standard on the seismic design of cold-formed steel special bolted moment frames (SBMF). It is expected that ductility is provided through bolt slippage and bearing in the moment connection region; both the beams and columns are to be designed based on the capacity design principles. This paper provides background information for the proposed seismic performance factors. Based on cyclic testing results, a value of 3.5 was proposed for the response modification coefficient, R. A statistical evaluation through nonlinear time-history analysis, which considered the unique structural characteristics of this framing system, showed that the Newmark-Hall ductility reduction rule is conservative. Based on the analysis results, a revised rule was proposed, which resulted in a deflection amplification factor, Cd, of R/1.2( ≈ 3.0). A design procedure in the AISI seismic standard allows the designer to directly calculate the maximum seismic force in the moment connection at the design story drift level, thereby an empirical system overstrength factor, Ω0, is unnecessary for the design of SBMFs. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i8/p961_s1?isAuthorized=no