Abstract
The damage evolutions of square concrete-filled steel tubular (CFT) columns were experimentally studied by the axial compression cyclic loading test and the acoustic emission (AE) monitoring technique. Based on the mechanical analysis and damage observations, the limit damage states, i.e. inner concrete cracking, confinement of steel tube, yielding and buckling of steel tube, weld seam splitting and inner concrete spalling were verified. The released strain energy due to the damage of CFT column was monitored by the AE technique and analyzed by the peak frequency classification method. The results show that the buckling of steel tube is the damage state with the maximum load carrying capacity for CFT columns. Most of the released strain energy were detected by the AE signals with the peak frequency between 30 and 75 kHZ and most of the strain energy were released after the buckling of the steel tube.
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