The authors estimated the deteriorated compressive strength of concrete filled square steel tube (square CFT) short columns after the maximum strength attained, which is defined as the stabilized compressive strength (
Nstab). Next, the stabilized bending moment (
Mstab) of square CFT columns were calculated by use of
Nstab. Compression tests of high strength square CFT short columns using steel-fibered concrete (FR-CFT) were also carried out, in order to improve the compressive ductility. As results, the following has been found: i)
Nstab decreases as the yield stress increases. ii) calculated
Mstab shows good agreement with the experimental results. iii) axial compressive ductility of square FR-CFT short column is higher than square CFT with concrete without steel fibered.
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