Abstract
In this paper, totally 7 innovative steel concrete composite columns were investigated for axial load and reported. 6 of them were modified DSHCFT columns consisting only outer skin tube and butting concrete and the remaining one was Double Skinned Hollow Concrete Filled steel Tubular columns having outer and inner steel tube (DSHCFT), which was annularly in-filled with Self-Compacting Concrete (SCC). The concrete grade and yield strength of steel tubes used were respectively M35 and 250MPa. The ratios of outer tube diameter to its thickness were 34 to 36. The length to outer diameter (aspect ratio) and the hollowness ratio were from 2.4 to 4.5 and from 0.35 to 0.5 respectively. Mechanical behaviour in term of stiffness, confinement, ultimate strength and ductility were discussed. Load Vs mid-span deflection diagrams, failure patterns of the specimens are presented. The existence of composite action between steel and concrete and confinement of concrete were experimentally evidenced. Suitability of two existing design codes is verified. For the design of the modified DSHCFT Stub columns with SCC and DSHCFTs, a possible simplified formula is suggested.Keywords: Failure mode, Stiffness, ductility, confinement, Ultimate load, Simplified formula.
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