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Title |
An Investigation on the Ultimate Strength of Duplex Stainless Steel (STS329FLD) Bolted Connections with Two Bolts
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Authors |
안성호(Sung-Ho An) ; 김근영(Geun-Young Kim) ; 황보경(Bo-Kyung Hwang) ; 김태수(Tae-Soo Kim) |
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DOI |
https://doi.org/10.11112/jksmi.2018.22.5.055 |
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Keywords |
듀플렉스계 스테인리스강 ; 볼트접합 ; 면외변형 ; 내력저하 ; 일면전단 ; 이면전단 ; 설계기준 Duplex stainless steel ; Bolted connection ; Curling ; Strength reduction ; Single shear ; Double shear ; Design specification |
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Abstract |
Recently, the use of duplex stainless steel which with a two-phase microstructure (equal mixture of ferrite and austenite) has been increased in a variety of industrial fields due to higher strength leading to weight saving, greater corrosion resistance(particularly, stress corrosion cracking) and lower price. However, currently, stainless steels are not included in the structural materials of Korean Building Code and corresponding design standards are not specified. In this paper, experimental studies have been performed to investigate the structural behaviors of duplex stainless steel (STS329FLD) bolted connection with two bolts for providing the design data. Main variables are shear connection type (single shear and double shear) and end distance parallel to the direction of applied force. Fracture modes at the final step of test 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 20%. Test strengths were compared with those by current design specifications such as AISC/AISI/KBC, EC3 and AIJ and proposed equations by existing studies. For specimens with no curling, Clement & Teh's equation considering the active shear plane provided a higher strength estimation accurancy and for specimens with curling, Kim & Lim's equation considering strength reduction by curling was also overly unconservative to predict the ultimate strength of curled connections.
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