Finite element analysis of all-steel cantilever-stiffener buckling-restrained braces
Arum Jang,Robel Wondimu Alemayehu,Young K. Ju,Jintak Oh
Abstract
This study develops and evaluates a cantilever-stiffened buckling-restrained brace (CAS-BRB) designed to enhance energy dissipation and cyclic stability while remaining compatible with conventional fabrication practice. A finite element framework was established to simulate a subassembly with a 2.0 m core, incorporating nonlinear steel behavior through combined isotropic-kinematic hardening, low-friction unbonded contact between the core and restrainer, initial geometric imperfections, and a quasi-static loading protocol consistent with seismic qualification practice. A low-yield steel equivalent to HSA80 was adopted for the core, while a conventional structural steel comparable to SS275 was used for restraining and stiffening components. The model was verified by benchmarking against published experimental results and by checking its response against recognized seismic design provisions. Parametric analyses were then conducted by varying the lengths of the welded and cantilever segments to isolate the role of staged engagement during compression. The results show that the cantilever segment delays the onset of strength degradation from the first compressive cycle at 1.5
Key Words
buckling constraints; buckling-restrained brace(BRB); energy dissipation capacity; local buckling; seismic retrofit; yielding length
Address
Arum Jang, Young K. Ju — School of Civil, Environmental and Architectural Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
Robel Wondimu Alemayehu — Department of Civil & Environmental Engineering, Auburn University, 1170 W Samford Ave., Auburn, AL 36849, USA
Jintak Oh — Department of Architectural & Civil Engineering, Kyungil University, 50 Gamasilgil, Hayangeup, Gyeongsan, Gyeongbuk, 38428, Korea
PDF Viewer
Preview is limited to the first 3 pages. Sign in to access the full PDF.
