Vol. 17, No. 2, pp. 149-157 (2021)
EXPERIMENT OF HYSTERETIC BEHAVIOR AND STABILITY PERFORMANCE OF
BUCKLING-RESTRAINED BRACED COMPOSITE FRAME
Ming-Ming Jia 1, 2, 3, *, Liang Li 3, Cheng Hong 4, Kai Liu 4 and Lin Sun 3
1 Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, P. R. China;
2 Key Laboratory of Earthquake Engineering and Engineering Vibration of China Earthquake Administration, Harbin 150080, P. R. China
3 School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, P. R. China
4 School of Civil Engineering and Architecture, Nanchang Institute of Technology, Nanchang 330099, P. R. China
*(Corresponding author: E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.)
Received: 4 June 2020; Revised: 6 February 2021; Accepted: 6 February 2021
DOI:10.18057/IJASC.2021.17.2.5
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ABSTRACT
One large-scale 2-story 1-bay buckling-restrained braced (BRBed) concrete-filled steel tube column composite frame (BRBCF) was tested, and the quasi-static cyclic test of the outer composite frame (CF) of BRBCF for comparison. The lateral stiffness, ultimate load bearing capacity and energy dissipation capability of the composite frame were significantly improved when installed with the BRBs. BRBCF exhibited good hysteretic behaviour and sustained story drifts of nearly 2% with large BRB maximum ductility demands, which was a double lateral-resistance structure system with high efficiency. The bolt splices connections of BRBs with CF frame played the intended function perfectly, but the test also indicated that the large flexural demand occurred on the typical beam-column-brace connection that caused the failure of BRB connection segments. In the test, in addition to the axial force, the buckling-restrained braces in the BRBCF were also affected by the bending moment, which led to the out-of-plane buckling of BRB bolt splices connection and significant decrease of bearing capacity and stiffness of the frame system. According to the failure modes of BRBCF, the reasons of joint failure were analyzed, and the design suggestions of improving the stability performance of BRB unrestrained connection segments were proposed.
KEYWORDS
Buckling-restrained brace, Hysteretic behaviour, Stability performance, Maximum ductility, Energy dissipation, Composite frame
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