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Jianguang Yue,Hua Fang,Yuefei Xia,Hongquan Wang,Kai Wu 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.6
The damage evolutions of square concrete-fi lled 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, confi nement of steel tube, yielding and buckling of steel tube, weld seam splitting and inner concrete spalling were verifi ed. The released strain energy due to the damage of CFT column was monitored by the AE technique and analyzed by the peak frequency classifi cation 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.