Mechanical Behavior of Aluminum Tubular Columns Filled with Steel Fiber Reinforced Concrete, "An Experimental Study”
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Abstract
Hollow aluminum tubular columns filled with concrete present a viable composite system by utilizing aluminum's excellent corrosion resistance and adequate yield strength. This study looked at how concrete-filled aluminum tubes (CFATs) performed structurally under axial loading when reinforced with steel fiber reinforced concrete (SFRC). Five specimens, each measuring 1000 mm in height and having square hollow aluminum parts of 100 x 100 x 3 mm, were made and put through axial compression testing. Concrete was mixed with steel fibers at fractions of volume of 0.5%, 1.0%, and 1.5% to assess the impact of the steel fibers on ductility, stiffness, and load-bearing capacity. The results showed that adding steel fibers increased stiffness and peak load by 13.7% to 74.1% and 15.6% to 45.6%, respectively. Furthermore, ductility improved significantly, with increases ranging from 9.1% to 42.4%. The optimal performance was achieved at a fiber content of 1%. Higher dosages resulted in diminished structural efficiency, likely due to fiber clustering and reduced homogeneity. Notably, in specimens without fibers, tearing at peak load was observed, attributed to lateral strain-induced tensile stresses in the aluminum shell. The inclusion of steel fibers effectively mitigated this issue by limiting lateral expansion and enhancing confinement.
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