Abstract
In the present study, an experimental research was conducted on square steel tube confined steel reinforced concrete column under eccentric load. The major parameters of the specimens included slenderness ratio, eccentricity ratio, and structural steel reinforced ratio. According to the tested results, the eccentricity ratio, from 0 to 0.55, significantly affects the structural bearing capacity. The slenderness ratio, from 3 to 8, and steel reinforced ratio, from 0.3 to 0.41, slightly affect the capacity. Furthermore, a numerical analysis program was developed, and the calculated results are well consistent with the experimental results. Also, the theoretical formula for eccentrically loaded columns was proposed based on numerical results.
Highlights
For the steel tube filled with concrete, effective lateral confinement has been provided to concrete by steel tube to improve the overall ductility and strength
Steel tube can serve as a formwork, thereby accelerating the construction process. e concrete around the steel tube can defer the local buckling of the steel tube
Steel tube filled with concrete has a lower fire resistance than concreteencased steel columns
Summary
The propagation of cracks in core concrete can be put off or avoided by the inserted structural steel, so the ultimate bearing capacity and ductility of the composite column are effectively improved [1, 2]. There are a large number of research studies on the behavior of steel tube-confined concrete columns under eccentric compression, and numerical modeling program was developed to study different characteristics of columns [11,12,13,14,15,16,17,18,19]. An experimental research was conducted on square steel tube column confined steel reinforced concrete subjected to eccentric load.
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