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http://dx.doi.org/10.12989/scs.2022.44.3.423

Seismic performance of the thin-walled square CFST columns with lining steel tubes  

Wang, Xuanding (School of Civil Engineering, Chongqing University)
Liu, Jiepeng (School of Civil Engineering, Chongqing University)
Wang, Xian-Tie (School of Civil Engineering, Xi'an University of Architecture & Technology)
Cheng, Guozhong (School of Civil Engineering, Chongqing University)
Ding, Yan (School of Civil Engineering, Xi'an University of Architecture & Technology)
Publication Information
Steel and Composite Structures / v.44, no.3, 2022 , pp. 423-436 More about this Journal
Abstract
This paper proposes an innovative thin-walled square concrete filled steel tubular (CFST) column with an octagonal/circular lining steel tube, in which the outer steel tube and the inner liner are fabricated independently of each other and connected by slot-weld or self-tapping screw connections. Twelve thin-walled square CFST columns were tested under quasi-static loading, considering the parameters of liner type, connection type between the square tube and liner, yield strength of steel tube, and the axial load ratio. The seismic performance of the thin-walled square CFST columns is effectively improved by the octagonal and circular liners, and all the liner-stiffened specimens showed an excellent ductile behavior with the ultimate draft ratios being much larger than 1/50 and the ductility coefficients being generally higher than 4.0. The energy dissipation abilities of the specimens with circular liners and self-tapping screw connections were superior to those with octagonal liner and slot-weld connections. Based on the test results, both the finite element (FE) and simplified theoretical models were established, considering the post-buckling strength of the thin-walled square steel tube and the confinement effect of the liners, and the proposed models well predicted the hysteretic behavior of the liner-stiffened specimens.
Keywords
confinement effect; hysteretic numerical model; octagonal/circular liner tube stiffener; seismic behavior; thin-walled square CFST;
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Times Cited By KSCI : 7  (Citation Analysis)
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