2행 1열 듀플렉스계 스테인리스강(STS329FLD) 볼트접합부의 최대내력 조사
An Investigation on the Ultimate Strength of Duplex Stainless Steel (STS329FLD) Bolted Connections with Two Bolts
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참고문헌
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초록
최근에 오스테나이트와 페라이트의 조직을 갖는 듀플렉스계 스테인리스강이 개발되었고 오스테나이트계 스테인리스강에 비해고강도, 응력부식균열에 대한 고내식성과 재료비절감으로 다양한 산업분야에서 사용량이 증가되고 있다. 그러나, 현재 스테인리스강은 한국건축구조기준에 구조용재료로 지정되어 있지 않고 구조설계기준도 마련되어 있지 않는 실정이다. 이 연구에서는 2행 1열 듀플렉스계 스테인리스강(STS329FLD) 볼트접합부에 대한 구조적 성능을 조사하기 위한 실험적 연구를 수행하였다. 주요변수는 전단접합형태(일면전단과 이면전단)과 하중방향 연단거리이다. 종국파단형태는 전형적인 블록전단파단, 인장파단과 면외변형이 관찰되었다. 일면전단 접합부에서 면외변형발생으로 최대 20%까지 내력저하가 발생되었다. 실험최대내력은 현행설계기준 AISC/AISI/KBC, EC3와 AIJ 및 기존연구자에 의한 제안된식에 의한 예측내력과 비교하였다. 면외변형이 발생하지 않은 접합부에 대해서 실제 전단파단단면을 고려한 Clement & The의 식에 의한 예측내력이 실험내력에 가장 근접했고 면외변형을 동반한 접합부에 대해서는 면외변형을 고려해 제안한 Kim & Lim식에 의해서 과대평가하는 것으로 나타났다.
Abstract
Recently, the use of duplex stainless steel which with a two-phase microstructure (equal mixture of ferrite and austenite) has been increasedin a variety of industrial fields due to higher strength leading to weight saving, greater corrosion resistance(particularly, stress corrosion cracking) andlower price. However, currently, stainless steels are not included in the structural materials of Korean Building Code and corresponding design standardsare 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 distanceparallel to the direction of applied force. Fracture modes at the final step of test were classified into typical block shear fracture, tensile fracture andcurling. Curling occurrence in single shear connection led to ultimate strength drop by up to 20%. Test strengths were compared with those by currentdesign 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 equationconsidering strength reduction by curling was also overly unconservative to predict the ultimate strength of curled connections.
참고문헌 (19)
- American Society of Civil Engineers, "Specification for the design of cold-formed stainless steel structural members", SEI, 2002
- American Institute of Steel Construction, "Steel Construction Manual", AISC 325-11, ~ (2010)
- American Institute of Steel Construction, "AISC Steel Design Guide 27-Structural Stainless Steel", AISC, ~ (2013)
- "EN 1993-1-4, Eurocode 3, Design of Steel Structur es part 1.4: General Rules-Supplementary Rules for Stainless Steel", European Committee for Standardization, ~ (2006)
- Stainless Steel Building Association of Japan, "Design manual of light- weight stainless steel structures", ~ (2006)
- Australian Standard, "New Zealand Standard", Cold-formed stainless steel structures, NZS 4673, pp.2001, ~
- Architectural Institute of Korea, "Korea Buildin g Code", ~ (2016)
- Kim, T.S, "Finite element modeling of bolted connections in thin-walled stainless steel plates under static shear", Thin-walled Structures, 45(4), pp.407~421 (2007)
- 김태수, "스테인레스강(STS304) 박판 일면전단 볼트 접합부의 거동에 관한 실험적 연구", 대한건축학회논문집 구조계, 26(05), pp.11~18 (2010), 대한건축학회
- 김태수, "Ultimate Strength of Single Shear Two-bolted Connections with Austenitic Stainless Steel", International Journal of STEEL STRUCTURES, 13(1), pp.117~128 (2013), 한국강구조학회
- 차은영, "연단거리를 변수로 갖는 오스테나이트계 스테인리스강(STS201) 일면전단 볼트접합부의 최대내력에 관한 해석연구", 한국구조물진단유지관리공학회 논문집, 21(5), pp.1~11 (2017), 한국구조물진단유지관리공학회
- Kim, M. S., "An Experimental Study on Ultimate Behavior of Bolted Connections with Thin-walled Ferritic Stainless Steel (STS430)", Proceedings of Annual Conference Architectural Institute of Korea, 30(1), pp.141~142 (2010), AIK
- LIM, J. S., "Ultimate strength of single shear bolted connections with cold-formed ferritic stainless steel", Journal of Zhejiang University-SCIENCE A, 14(2), pp.120~136 (2013)
- 김지훈, "페라이트계 스테인리스강 2행 2열 일면전단 볼트접합부의 최대내력평가", 한국강구조학회 논문집, 25(6), pp.659~669 (2013), 한국강구조학회
- Korean Standard, "Cold rolled stainless steel, plates, sheet and strip", KS D 3698, ~ (2015)
- American Iron., "North American Specification for the Design of Cold-Formed Steel Structural Members", AISI S100-12, ~ (2012)
- Architectural Institute of Japan, "Recommenda tion for Limit State Design of Steel Structures", AIJ, ~ (2002)
- Clements, DDA, "Active Shear Planes of Bolted Connections Failing in Block Shear", Journal of Structural Engineering, 139(3), pp.320~327 (2013), ASCE
- Teh, L.H, "Effective Shear Plane Model for Tearout and Block Shear Failure of Bolted Connections", Engineering Journal, 54, pp.181~194 (2017), American Institute of Steel Construction