The conventional brace system is generally accepted lateral load resisting system for steel structures due to efficient story drift control and economic feasibility by frame materials decrease. But the lateral stiffness of the brace decreases following buckling in this system and buckling causes unstable structures with strength deterioration hysteresis performance. Buckling restrained brace system that performs stable behavior after yielding of core element prevented from buckling by tube element is better than conventional brace system in point of earthquake energy absorbing capacity. This system has the advantages of maintenance, economics and satisfying the performance objective for seismic design. So recently, research and technology development of buckling restrained brace system increase. The existing buckling restrained braces have been developed in various sections and connection types with structures while the research considering production and construction availability, lateral constraints of core-end and matching with the construction plan is insufficient. Accordingly in this study, the optimum alternative system of the buckling restrained brace satisfying the above conditions and system application expansion possibility is suggested.

• 신승훈(부산대학교 건축공학과, 박사과정) | Shin, Seung Hoon 교신저자
• 오상훈(부산대학교 건축공학과 교수, 공학박사) | Oh, Sang Hoon