강종차이에 따른 스테인리스강 각형강관 압축재의 좌굴거동에 관한 실험적 연구

초록

An experimental study on austenitic stainless steel (STS304 TKC and STS316 TKC) and lean duplex stainless steel (STS329FLD TKC) square hollow section (SHS) columns subjected to centrally axial compression has been conducted to investigate the buckling behaviors of the compression members with both fixed ends. Main variables are steel type, column length and width-thickness ratio. Buckling modes at ultimate state were classified into local buckling and global buckling. From tensile material test results, cold-working hardening led to strength enhancement by 2.10 and 1.31 times, respectively compared to design yield stress and tensile strength. Compressive material properties of SHS members was also investigated through stub column tests. Stub columns and duplex stainless steel columns showed a local buckling mode. The test buckling strengths were compared with those predicted by current stainless steel design specifications (American Society of Civil Engineers [ASCE]) and Eurocode[EC3]) for stainless steel compressive members, American Iron and Steel Institute (AISI) for carbon steel and equations by other researchers. As a result, it is found that design strengths with compressive material test data of stub column than tensile material data were close to test buckling strength.

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