중심압축력을 받는 냉간성형 탄소강 각형강관 압축재의 좌굴거동에 관한 실험적 연구

Abstract

An experimental study was performed to investigate the structural behaviors of cold-formed carbon steel square hollow section columns to provide basic data of Korean design specifications for cold-formed steel structures. Specimens were fabricated with carbon steel square pipes for general structural purpose (SRT275). Main variables included the column length of 250mm, 1000mm and 2000mm, section dimension of 50x50mm and 75x75mm and section thickness of 2.0mm and 2.9mm. The initial imperfections of the specimen surface were measured and the material properties of these specimens satisfied the minimum requirement of Korean standards. All of the specimens or stubs with the column length of 250mm showed local buckling. The ultimate state of specimens with 1000mm and 2000mm column lengths were determined by local buckling or global buckling. Despite the large slenderness ratio, local buckling was observed in some specimens with a slender section element and a relatively large width-thickness ratio. Test results were compared with ultimate buckling strengths predicted by current design specifications of the Korean Design Standard (KDS), American Institute of Steel Construction (AISC), Eurocode 3 (EC3), and the American Iron and Steel Institute (AISI). © 2022 Architectural Institute Of Korea.