Nonlinear finite element analysis for cyclic behavior of thin-walled stiffened rectangular steel columns with In-filled concrete / Yoshiaki Goto in Journal of structural engineering, Vol. 138 N° 5 (Mai 2012)  

Public ISBD [article]  inJournal of structural engineering > Vol. 138 N° 5 (Mai 2012) . - pp.571–584. Titre : Nonlinear finite element analysis for cyclic behavior of thin-walled stiffened rectangular steel columns with In-filled concrete Type de document : texte imprimé Auteurs : Yoshiaki Goto, Auteur ; Kosuke Mizuno, Auteur ; Ghosh Prosenjit Kumar, Auteur Année de publication : 2012 Article en page(s) : pp.571–584. Note générale : Génie civil Langues : Anglais (eng) Mots-clés : CFT column Finite element method Buckling Metal fracture In-filled concrete Upgrading mechanism Résumé : The strength, ductility, and energy dissipation capacity of thin-walled, stiffened rectangular concrete-filled steel columns (thin-walled stiffened RCFT columns) subjected to cyclic loads are significantly upgraded by filling with concrete the internal hollow space of rectangular steel tube with longitudinal stiffeners and diaphragms. However, because of the accumulation of plastic strains and the high tensile stress concentration in thin-walled steel columns, metal fracture sometimes occurs before the columns develop their high strength and ductility. To elucidate the behavior of CFT columns and prevent the premature failure resulting from metal fracture, it is necessary to develop some geometrically and materially nonlinear finite element (FE) models that can accurately take into account important factors such as cyclic local buckling, stress and strain concentrations in the steel tube, confinement of the in-filled concrete, and interface action between steel tube and in-filled concrete. In this paper an accurate and yet, numerically stable FE model, which fully includes these important factors, is proposed. The accuracy of the proposed model is confirmed by comparison with the existing cyclic-loading tests on thin-walled stiffened RCFT columns. By utilizing the numerical results obtained by the proposed FE model, the upgrading mechanism and metal fracture of thin-walled stiffened RCFT columns are discussed in detail. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000504 [article] Nonlinear finite element analysis for cyclic behavior of thin-walled stiffened rectangular steel columns with In-filled concrete [texte imprimé] / Yoshiaki Goto, Auteur ; Kosuke Mizuno, Auteur ; Ghosh Prosenjit Kumar, Auteur . - 2012 . - pp.571–584. Génie civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 138 N° 5 (Mai 2012) . - pp.571–584. Mots-clés : CFT column Finite element method Buckling Metal fracture In-filled concrete Upgrading mechanism Résumé : The strength, ductility, and energy dissipation capacity of thin-walled, stiffened rectangular concrete-filled steel columns (thin-walled stiffened RCFT columns) subjected to cyclic loads are significantly upgraded by filling with concrete the internal hollow space of rectangular steel tube with longitudinal stiffeners and diaphragms. However, because of the accumulation of plastic strains and the high tensile stress concentration in thin-walled steel columns, metal fracture sometimes occurs before the columns develop their high strength and ductility. To elucidate the behavior of CFT columns and prevent the premature failure resulting from metal fracture, it is necessary to develop some geometrically and materially nonlinear finite element (FE) models that can accurately take into account important factors such as cyclic local buckling, stress and strain concentrations in the steel tube, confinement of the in-filled concrete, and interface action between steel tube and in-filled concrete. In this paper an accurate and yet, numerically stable FE model, which fully includes these important factors, is proposed. The accuracy of the proposed model is confirmed by comparison with the existing cyclic-loading tests on thin-walled stiffened RCFT columns. By utilizing the numerical results obtained by the proposed FE model, the upgrading mechanism and metal fracture of thin-walled stiffened RCFT columns are discussed in detail. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000504

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