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Longitudinal stiffeners in concrete-filled tubes / Kyoung C. Lee in Journal of structural engineering, Vol. 138 N° 6 (Juin 2012) 

Public ISBD [article]  in Journal of structural engineering > Vol. 138 N° 6 (Juin 2012) . - pp. 753–758 Titre : Longitudinal stiffeners in concrete-filled tubes Type de document : texte imprimé Auteurs : Kyoung C. Lee, Auteur ; Yoo, Chai H., Auteur Année de publication : 2012 Article en page(s) : pp. 753–758 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Column  buckling  Eigenvalue  Finite  element  method  Imperfections  Longitudinal  stiffeners  Mode  shape  Plate  buckling  Postbuckling  strength  Residual  stresses Résumé : To enhance the strength and constructability of rectangular (or trapezoidal) tubular compression members, reinforced or unreinforced concrete may be filled in the tube. Longitudinal stiffeners are often attached to increase the local buckling strength of the thin-walled skin. The effect of important design parameters on the minimum required stiffener moment of inertia was investigated numerically in this study by examining the residual stress distributions, initial imperfections, and elastic and inelastic buckling stresses of a number of hypothetical models. Because the thin-walled panel can only buckle (bulge) out from the concrete core, the buckling mode shape of a panel with multiple stiffeners resembles a waffle slab. A series of parametric studies was performed to characterize and quantify the analytically collected data. A new equation for the minimum required moment of inertia for the longitudinal stiffeners was derived. Through the evaluation of a few selected case studies and a design example, the validity and reliability of the proposed equation was demonstrated. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000526 [article] Longitudinal stiffeners in concrete-filled tubes [texte imprimé] / Kyoung C. Lee, Auteur ; Yoo, Chai H., Auteur . - 2012 . - pp. 753–758. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 138 N° 6 (Juin 2012) . - pp. 753–758 Mots-clés : Column  buckling  Eigenvalue  Finite  element  method  Imperfections  Longitudinal  stiffeners  Mode  shape  Plate  buckling  Postbuckling  strength  Residual  stresses Résumé : To enhance the strength and constructability of rectangular (or trapezoidal) tubular compression members, reinforced or unreinforced concrete may be filled in the tube. Longitudinal stiffeners are often attached to increase the local buckling strength of the thin-walled skin. The effect of important design parameters on the minimum required stiffener moment of inertia was investigated numerically in this study by examining the residual stress distributions, initial imperfections, and elastic and inelastic buckling stresses of a number of hypothetical models. Because the thin-walled panel can only buckle (bulge) out from the concrete core, the buckling mode shape of a panel with multiple stiffeners resembles a waffle slab. A series of parametric studies was performed to characterize and quantify the analytically collected data. A new equation for the minimum required moment of inertia for the longitudinal stiffeners was derived. Through the evaluation of a few selected case studies and a design example, the validity and reliability of the proposed equation was demonstrated. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000526