Abstract
Concrete-filled tubular (CFT) columns have been widely used as structural members because CFT columns synergize the advantages of steel and concrete resulting in high strength, high ductility, and large energy dissipation capacity. Numerous studies have been performed to understand the behavior of CFT columns. However, the behavior of CFT columns remains uncertain due to their inelastic behavior and uncertain confinement effects, especially when failure occurs. In addition, diaphragms, which are generally installed, make it more complicated to understand the behavior of CFT columns. The purpose of this study is to investigate the effects of the diaphragms on the failure behavior of the CFT columns. To this end, eighteen rectangular CFT columns were tested with five different loading cases. The experimental results suggest that the size of the diaphragm has significant effects on the compressive strength and toughness of the CFT columns. In order to facilitate the proper composite actions of steel and concrete, the size of a diaphragm has to be at least three-quarters of the cross-sectional area.
Highlights
Concrete-filled tubular (CFT) columns combine both the advantages of steel and concrete resulting in high strength, high ductility, and large energy dissipation capacity
In order to investigate the effects of the diaphragms on the failure behavior of the CFT columns, experimental results were averaged for comparisons by employing the method proposed by Zhao et al [20]
As the steel tube only resists vertical loads induced by the friction, the compressive strength of concrete is loaded (CE) was smaller than that of SC
Summary
Concrete-filled tubular (CFT) columns combine both the advantages of steel and concrete resulting in high strength, high ductility, and large energy dissipation capacity. These features arise from composite action between concrete and steel: Inner concrete prevents inward local bucking of steel while outer steel increase the compressive strength of concrete by confining lateral expansion of concrete [1]. O’Shea and Bridge developed design methods that can be used to estimate the strength of circular thin-walled CFT columns under different loading conditions considering small eccentricities [3]. Giakoumelis and Lam experimentally studied the strength of circular CFT columns considering steel tube thickness, concrete strength, and bonding conditions, and concluded that design codes of CFT columns underestimated the strength [4]. Zeghiche and Chaoui evaluated the effects of slenderness, load eccentricity, and compressive strength of concrete on load
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