Abstract
Abstract - An experimental study was performed for thin-walled recta ngular concrete-filled tubular (CFT) columns. The present study mainly focused on evaluation of the axial load-carrying capacity of concrete-filled tubular columns using high-strength steel and slender section. The test parameters were width-to-thickness ratio, concrete strength, steel yield strength, and the use of stiffeners. Five specimens were tested under monotonic axial loading. Although elastic local buckling occurred in the slender- section specimens with high-strength steel, the specimens exhibited considerable post-buckling reserve. The test results also satisfied the predictions of a current design code. The specimens strengthened with vertical stiffeners exhibited improved strength and ductility when compared with the un-stiffened specimens. Keywords - Rectangular CFT column, High-strength steel, Slender section, Concentric axial loading, StiffenerNote.-Discussion open until October 31, 2015. This manuscript for this paper was submitted for review and possible publication on May 18, 2014; revised October 25, 2014; approved on February 5, 2015.Copyright ⓒ 2015 by Korean Society of Steel Construction
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