Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Ultimate capacity of rectangular concrete-filled steel tubular columns under unequal load eccentricities
Abstract The paper describes 36 experimental tests conducted on rectangular and square tubular columns filled with normal and high strength concrete and subjected to a non-constant bending moment distribution with respect to the weak axis. The test parameters were the nominal strength of concrete (30 and 90MPa), the cross-section aspect ratio (square or rectangular), the thickness (4 or 5mm) and the ratio of the top and bottom first order eccentricities etop/ebottom (1, 0.5, 0 and −0.5). The ultimate load of each test was compared with the design loads from Eurocode 4, presenting unsafe results inside a 10% safety margin. The tests show that the use of high strength concrete is more useful for the cases of non-constant bending moment, whereas if the aim is to obtain a more ductile behavior the use of concrete-filled columns is more appealing in the cases of normal strength concrete with non-constant bending moments because, although they resist less axial force than the members with HSC, they obtain a softened post-peak behavior.
Highlights ►36 tests of rectangular CFT columns under axial load and non-constant flexure ►The use of HSC is more useful with regards to the HSS for variable bending moment. ►The ductility is more dependent from strength of concrete than on the eccentricity.
Ultimate capacity of rectangular concrete-filled steel tubular columns under unequal load eccentricities
Abstract The paper describes 36 experimental tests conducted on rectangular and square tubular columns filled with normal and high strength concrete and subjected to a non-constant bending moment distribution with respect to the weak axis. The test parameters were the nominal strength of concrete (30 and 90MPa), the cross-section aspect ratio (square or rectangular), the thickness (4 or 5mm) and the ratio of the top and bottom first order eccentricities etop/ebottom (1, 0.5, 0 and −0.5). The ultimate load of each test was compared with the design loads from Eurocode 4, presenting unsafe results inside a 10% safety margin. The tests show that the use of high strength concrete is more useful for the cases of non-constant bending moment, whereas if the aim is to obtain a more ductile behavior the use of concrete-filled columns is more appealing in the cases of normal strength concrete with non-constant bending moments because, although they resist less axial force than the members with HSC, they obtain a softened post-peak behavior.
Highlights ►36 tests of rectangular CFT columns under axial load and non-constant flexure ►The use of HSC is more useful with regards to the HSS for variable bending moment. ►The ductility is more dependent from strength of concrete than on the eccentricity.
Ultimate capacity of rectangular concrete-filled steel tubular columns under unequal load eccentricities
Hernández-Figueirido, D. (Autor:in) / Romero, M.L. (Autor:in) / Bonet, J.L. (Autor:in) / Montalvá, J.M. (Autor:in)
Journal of Constructional Steel Research ; 68 ; 107-117
30.07.2011
11 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Reinforced Concrete Columns under Unequal Load Eccentricities
| Online Contents | 2003
Design of Slender Reinforced Concrete Columns for Unequal Load Eccentricities
| British Library Conference Proceedings | 2002