중심압축력을 받는 기계구조용 스테인리스강 강관 기둥의 좌굴거동에 관한 실험적 연구

초록

Buckling behaviors of cold-formed duplex stainless steel (STS329FLD TKC) and austenitic stainless steel (STS304 TKC) hollow tubular column subjected to concentric axial compression were investigated in this study. A total number of 8 specimens with both fixed ends has been tested. Main variable is slenderness ratio (four kinds of column length : 250 mm, 500 mm, 750 mm, 1000mm) with identical nominal diameter and plate thickness. Yield stress and tensile strength of duplex stainless steel were higher by 41% and 18%, respectively than those of austenitic stainless steel. Local buckling, global buckling and its combination were observed according to column length(slenderness ratio). Buckling strength got lower with the increase of member length (slenderness ratio). Test buckling strengths were compared with those predicted by the ASCE(American Society of Civil Engineers) specification, Eurocode 3 part 1.4 (EC3) and existing literature’ suggestion. Strengths of specimens with local buckling were underestimated by current design codes and for specimens with global buckling, ASCE2002 and EC3 overestimated the buckling strengths by the range of 2% to 26% due to no enough consideration of buckling reduction factor, slenderness ratio, buckling stress and initial imperfection effect.

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