Influence of slenderness on high-strength rectangular concrete-filled tubular columns with axial load and nonconstant bending moment / D. Hernández-Figueirido in Journal of structural engineering, Vol. 138 N° 12 (Décembre 2012)  

Public ISBD [article]  inJournal of structural engineering > Vol. 138 N° 12 (Décembre 2012) . - pp. 1436–1445 Titre : Influence of slenderness on high-strength rectangular concrete-filled tubular columns with axial load and nonconstant bending moment Type de document : texte imprimé Auteurs : D. Hernández-Figueirido, Auteur ; M. L. Romero, Auteur ; J. L. Bonet, Auteur Année de publication : 2013 Article en page(s) : pp. 1436–1445 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Composite columns High-strength concrete Experimental testing Concrete-filled steel tube Beam Tubes Structural design Résumé : Forty-nine experimental tests were conducted on rectangular and square tubular columns filled with high-strength concrete (f'c=90 MPa) subjected to axial load and a nonconstant bending moment distribution. The test parameters were the length (2, 3, and 4 m), the cross-section aspect ratio (square or rectangular), the wall thickness (4 or 5 mm), and the ratio of the top and bottom first-order eccentricities r=etop/ebottom (1, 0.5, 0, and −0.5). The effect of slenderness combined with the influence of variable curvature is compared with the design loads from AISC 360-10 and Eurocode 4. The results show that, for the slender elements of this experimental campaign, both codes present a similar error close to 4%. The small error margin indicates that both standards are applicable to high-strength concrete, although the concrete tested is outside the upper bond of Eurocode 4 and AISC’s specifications. However, there are particular cases that present excessive unsafe errors. These errors correspond to the cases where the second-order effects are more important and are attributable to an overestimation of the flexural stiffness E⋅I, which indicates that it needs correction. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000590 [article] Influence of slenderness on high-strength rectangular concrete-filled tubular columns with axial load and nonconstant bending moment [texte imprimé] / D. Hernández-Figueirido, Auteur ; M. L. Romero, Auteur ; J. L. Bonet, Auteur . - 2013 . - pp. 1436–1445. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 138 N° 12 (Décembre 2012) . - pp. 1436–1445 Mots-clés : Composite columns High-strength concrete Experimental testing Concrete-filled steel tube Beam Tubes Structural design Résumé : Forty-nine experimental tests were conducted on rectangular and square tubular columns filled with high-strength concrete (f'c=90 MPa) subjected to axial load and a nonconstant bending moment distribution. The test parameters were the length (2, 3, and 4 m), the cross-section aspect ratio (square or rectangular), the wall thickness (4 or 5 mm), and the ratio of the top and bottom first-order eccentricities r=etop/ebottom (1, 0.5, 0, and −0.5). The effect of slenderness combined with the influence of variable curvature is compared with the design loads from AISC 360-10 and Eurocode 4. The results show that, for the slender elements of this experimental campaign, both codes present a similar error close to 4%. The small error margin indicates that both standards are applicable to high-strength concrete, although the concrete tested is outside the upper bond of Eurocode 4 and AISC’s specifications. However, there are particular cases that present excessive unsafe errors. These errors correspond to the cases where the second-order effects are more important and are attributable to an overestimation of the flexural stiffness E⋅I, which indicates that it needs correction. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000590

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