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논문 기본 정보

자료유형
학술저널
저자정보
Krishanu Roy (The University of Auckland) Hieng Ho Lau (Swinburne University of Technology) Zhiyuan Fang (The University of Auckland) Abdeliazim Mustafa Mohamed Ahmed (Prince Sattam Bin Abdulaziz University) James B.P. Lim (The University of Auckland)
저널정보
국제구조공학회 Steel and Composite Structures, An International Journal Steel and Composite Structures, An International Journal Vol.40 No.5
발행연도
2021.9
수록면
761 - 780 (20page)

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In cold-formed steel structures, such as trusses, wall frames and portal frames, the use of back-to-back built-up cold-formed stainless steel unlipped channels as compression members are becoming popular. The advantages of using stainless steel as structural members are corrosion resistance and durability, compared with carbon steel. Current guidance by the American Iron and Steel Institute (AISI) and the Australian and New Zealand (AS/NZS) standards for built-up carbon steel sections describes a modified slenderness approach, to consider the spacing of the intermediate fasteners. The AISI and AS/NZS do not include the design of stainless-steel built-up channels and very few experimental tests or finite element (FE) analyses have been reported in the literature for such back-to-back cold-formed stainless steel unlipped channel section columns. This paper presents a numerical investigation on the behavior of back-to-back built-up cold-formed stainless steel unlipped channel section columns. Three different grades of stainless steel i.e., duplex EN1.4462, ferritic EN1.4003 and austenitic EN1.4404, were considered. The effects of screw spacing on the axial strength of such built-up unlipped channels were investigated. As expected, most of the short and intermediate columns failed by either local-global or local-distortional buckling interactions, whereas the long columns failed by global buckling. All three grades of stainless-steel stub columns failed by local buckling. A comprehensive parametric study was then carried out covering a wide range of slenderness and different cross-sectional geometries to assess the performance of the current design guidelines of carbon steel built-up sections in accordance with the AISI and AS/NZS. In total, 647 FE models were analyzed. From the results of the parametric study, it was found that the AISI and AS/NZS are conservative by around 14 to 20% for all three grades of stainless steel built-up unlipped channel section columns failed through global buckling. However, the AISI and AS/NZS carbon steel design rules can be un-conservative by around 8 to 13%, when they are used to calculate the axial capacity of those stainless steel built-up unlipped channels which are failed in local buckling.
#axial strength #back-to-back sections #built-up sections #cold-formed stainless steel #finite element analysis #screw spacing #unlipped channels

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참고문헌 (30)

참고문헌 신청
M. Anbarasu / 2015 / Investigation on the behaviour and strength of cold-formed steel web stiffened built-up battened columns / Materials and Structures 48(12):4029~4038 Crossref Aslani, F. / 1991 / An analytical criterion for buckling strength of built-up compression members / J. Struct. Eng. Am. Soc. Civil Engineers 28(4):159~168 google schola M. Ashraf / 2005 / Strength enhancement of the corner regions of stainless steel cross-sections / Journal of Constructional Steel Research 61(1):37~52 Crossref N.R. Baddoo / 2008 / Stainless steel in construction: A review of research, applications, challenges and opportunities / Journal of Constructional Steel Research 64(11):1199~1206 Crossref Jurgen Becque / 2009 / Experimental Investigation of the Interaction of Local and Overall Buckling of Stainless Steel I-Columns / Journal of Structural Engineering 135(11):1340~1348 Crossref

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