Vol. 17, No. 4, pp. 366-375 (2021)
EXPERIMENTAL BEHAVIOR AND DESIGN OF RECTANGULAR
CONCRETE-FILLED TUBULAR BUCKLING-RESTRAINED BRACES
Yan-Chao Yue 1, Yong-Tao Bai 2, *, Yan Wang 1, Xiao-Fei Ma 3, Yu-Hang Wang 2 and Xiao-Hua Li 2
1 Department of Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, China
2 School of Civil Engineering, Chongqing University, Chongqing 400045, China
3 China Railway First Survey and Design Institute Group Co., Ltd., Xi’an 710043, China
*(Corresponding author: E-mail:This email address is being protected from spambots. You need JavaScript enabled to view it.)
Received: 25 January 2021; Revised: 27 May 2021; Accepted: 28 May 2021
DOI:10.18057/IJASC.2021.17.4.5
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ABSTRACT
This paper proposes a new design method for concrete-filled tubular buckling-restrained braces (CFT-BRBs) by incorporating the confinement effect on pre-buckling rigidity. A series of experiments are performed to investigate the effects of concrete strength and sectional dimension on the initial stiffness, ultimate strength, and energy dissipation behaviors. Experimental results indicate that the confined concrete plays an important role in the energy dissipating capacity of CFT-BRBs. On the other hand, the sectional dimensions of the steel tube and core are influential factors governing the ultimate failure modes of CFT-BRBs. The findings in study provide technical supports to optimize the design methods for ductile seismic performance of CFT-BRBs in low-rise and high-rise steel buildings.
KEYWORDS
Buckling-restrained braces, Concrete-filled steel tube, Buckling mechanism, Cumulative plastic deformation, Energy dissipation, Performance-based design
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