Détail de la notice
Titre du Document
Axial load behavior of self-consolidating concrete-filled steel tube columns in construction and service stages
Auteur(s)
LACHEMI Mohamed ; HOSSAIN Khandaker M. A. ; LAMBROS Vasilios B.
Résumé
This paper compares the performance of axially loaded concrete-filled steel tube (CFST) columns cast using a conventionally vibrated normal concrete (NC) and a self-consolidating concrete (SCC) made with a new viscosity-modifying admixture (VMA). A total of 16 columns with a standard compressive strength of approximately 50 MPa for both SCC and NC were tested by applying concentric axial load through the concrete core. The effect of various parameters such as slenderness ratios, types of concrete, and the addition of longitudinal and hoop reinforcements at different degrees of confinement was studied. Columns were fabricated without and with longitudinal and hoop reinforcement (Series CI and Cll, respectively) in addition to the tube confinement. The slenderness ratio of the columns, expressed as height-to-diameter ratio (H/D), ranged between 4.8 and 9.5 for Series CI and between 3.1 and 6.5 for Series CII. In the construction stage, the performance was evaluated based on the consolidation characteristics with different degrees of congestion and the required casting time. In the service stage, the performance was judged based on strength, ductility, stress-strain characteristics, degrees of confinement, load sharing between steel tube and confined concrete, and failure modes. Test results showed that the ease of placement and time of casting were considerably improved for columns with SCC compared to those with NC. The strength of SCC columns was found comparable to that of t
Editeur
American Concrete Institute
Identifiant
ISSN : 0889-3241
Source
ACI structural journal A. 2006, vol. 103, n° 1, pp. 38-47 [10 pages]
Langue
Anglais
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