Vol. 19, No. 4, pp. 375-382 (2023)
AN EXPERIMENTAL STUDY ON SEISMIC PERFORMANCE OF
STEEL COMPOSITE BEAM-COLUMN RIGID JOINT AND
BUCKLING RESTRAINED KNEE-BRACED JOINT
Feng Xu 1, *, Zhe Yuan 1, Na Liu 1, Zhen-Xing Li 1, 2, Lian-Guang Jia 1 and Wei Xu 1
1 School of Civil Engineering, Shenyang Jianzhu University, Shenyang 110168, China
2 China Southern Airlines Co., Ltd., Shenyang Maintenance Base, Shenyang 110169, China
*(Corresponding author: E-mail:This email address is being protected from spambots. You need JavaScript enabled to view it.)
Received: 27 November 2022; Revised: 29 June 2023; Accepted: 27 August 2023
DOI:10.18057/IJASC.2023.19.4.6
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ABSTRACT
This paper evaluates the seismic performance of conventional steel composite beam-column rigid joints, and a novel buckling restrained knee-braced joint (BRKBJ), considering the impact of the floor slab. A series of quasi-static comparative tests were conducted to analyze the failure mode, load-bearing capacity, hysteresis performance, and ductility of both types of joints. Our findings revealed that the hysteretic curve of the BRKBJ exhibits a robust and shuttle-like shape, suggesting an adequate energy dissipation performance. However, its yield displacement is relatively small. Conversely, there is a marginal increase in the yield displacement of the beam and column, along with a significant rise in the yield load when compared to the rigid joint. The ultimate load-bearing capacity increases by 32.6%, and the displacement under this ultimate load decreases by 19.2%. Furthermore, the equivalent viscous damping coefficient and the ductility coefficient see an increase of 14.5% and 21.6%, respectively. When damage occurs to the joint, the buckling restrained knee brace helps shift the plastic hinge outwards, safeguarding the beam-column joint. It was also observed that the impact of the buckling restrained knee brace on the hysteretic behavior of the composite beam-column rigid connection at the beam end during the tension phase is notably more than during the compression phase. The presence of a floor has minimal effect on the BRKBJ.
KEYWORDS
Steel structure, Combined beam-column joint, Buckling restrained knee brace, Quasi-static test, Seismic performance
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