Abstract—Concrete-filled steel tube column achieves excellent performance of high strength, stiffness and ductility due to the confinement effect from the steel tube. Well understanding the stress of the steel tube is important to make clear the confinement effect. In this paper, the ultimate stress of the steel tube in circular concrete-filled steel tube columns subjected to axial compression was studied. Experimental tests were conducted to investigate the influences of the parameters of the column, including concrete strength, steel strength, and D/t ratio, on the ultimate stress of the steel tube. The stress of the steel tube is determined by the Prandtl-Reuss flow rule associated with isotropic strain hardening. Results indicate that the stress of steel tube was influenced by the parameters. Steel tube in the specimen with higher strength ratio fy/fc and/or smaller D/t ratio generally exhibits a higher strain hardening behavior, thus leading to a higher utilization efficiency of the steel tube.
Index Terms—Ultimate stress of the steel tube, CFT stub columns, experimental tests.
Siqi Lin and Yan-gang Zhao are with the Dept. of Architecture and Building Engineering, Kanagawa University, Yokohama, 2218686 Japan (e-mail: lsq8986@gmail.com, zhao@kanagawa-u.ac.jp).c
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Cite: Siqi Lin and Yan-Gang Zhao, "Ultimate Stress of the Steel Tube in Circular CFT Stub Columns Subjected to Axial Compression," International Journal of Engineering and Technology vol. 10, no. 4, pp. 315-319, 2018.
