듀플렉스계 스테인리스강 2행 2열 볼트접합부의 구조거동에 관한 실험적 연구

초록

Recently, duplex stainless steel with higher strength, greater corrosion resistance (particularly, stress corrosion cracking) and lower cost compared with austenitic stainless steel has been developed. However, stainless steels are not included in the structural materials of Korean Building Code(KBC) and corresponding design specifications are not regulated. In this paper, experimental studies have been performed to investigate the structural behaviors of duplex stainless steel (STS329FLD) four-bolted connections for providing the basic data of domestic design specification. Main variables are shear connection type (single shear and double shear) and end distance parallel to the direction of applied force. Fracture modes were classified into typical block shear fracture, tensile fracture and curling. Curling occurrence in single shear connection led to ultimate strength drop by up to 17%. Test strengths were compared with those by current design specifications and proposed equations by previous researches. For specimens with no curling, AISC/AISI/KBC, EC3 and Clement & Teh’s equations underestimated the strength. AIJ and Teh & Deierlein overestimated the strength of bolted connection. For specimens with curling, Kim & Lim’s equation was also overly unconservative to predict the ultimate strength of curled connections.

키워드