Abstract
This paper presents a brief review of previous research work done on uniaxial compressive behavior of concrete filled steel tubular (CFT) columns and the results of experimental study conducted on twenty four number of cold-formed steel square sections filled with conventional concretes of grade M30 and M60 tested under uniaxial compression. The effect of length to breadth (L/B) ratio of square steel tubes and concrete core strength of CFTs on axial compressive strength and behavior of CFT columns was studied. The experimental strength values were compared with predictions using Eurocode 4-1994, ACI 1999, AS 3600-1994, AISC-LRFD-1999, AISC 2005, GJB 4142-2000 and BS 5400-1979 and from equation suggested by previous researcher. The effect of breadth to thickness (B/t) ratio, % steel area contribution and constraining factor on axial compressive strength was also examined. The results showed that the axial compressive strength of CFTs increases due to confinement effect of concrete core on steel tubes and the estimation of axial compressive strength using all methods is conservative. A modified equation is also suggested.
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