Finite element modelling of back-to-back built-up cold-formed stainless-steel lipped channels under axial compression

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dc.contributor.author Roy, Krishanu en
dc.contributor.author Lau, HH en
dc.contributor.author Lim, James en
dc.date.accessioned 2019-11-07T21:06:20Z en
dc.date.issued 2019-10-10 en
dc.identifier.issn 1229-9367 en
dc.identifier.uri http://hdl.handle.net/2292/48887 en
dc.description.abstract In cold-formed steel structures, such as trusses, wall frames and portal frames, the use of back-to-back built-up coldformed stainless-steel lipped channels as compression members are becoming increasingly popular. The advantages of using stainless-steel as structural members are corrosion resistance and durability, compared with carbon steel. The AISI/ASCE Standard, SEI/ASCE-8-02 and AS/NZS do not include the design of stainless-steel built-up channels and very few experimental tests or finite element analyses have been reported in the literature for such back-to back cold-formed stainless-steel channels. 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 only describe a modified slenderness approach, to consider the spacing of the intermediate fasteners. Thus, this paper presents a numerical investigation on the behavior of back-to-back cold-formed stainless-steel built-up lipped channels. Three different grades of stainless steel i.e., duplex EN1.4462, ferritic EN1.4003 and austenitic EN1.4404 have been considered. Effect of screw spacing on the axial strength of such built-up channels was 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 by AISI and AS/NZS. In total, 647 finite element models were analyzed. From the results of the parametric study, it was found that the AISI & AS/NZS are conservative by around 10 to 20% for cold-formed stainless-steel built-up lipped channels failed through overall buckling, irrespective of the stainless-steel grades. However, the AISI and AS/NZS can be un-conservative by around 6% for all three grades of stainless-steel built-up channels, which failed by local buckling. en
dc.publisher Techno-press en
dc.relation.ispartofseries Steel and Composite Structures en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.title Finite element modelling of back-to-back built-up cold-formed stainless-steel lipped channels under axial compression en
dc.type Journal Article en
dc.identifier.doi 10.12989/scs.2019.33.1.037 en
pubs.issue 1 en
pubs.begin-page 37 en
pubs.volume 33 en
dc.rights.holder Copyright: The author en
pubs.end-page 66 en
dc.rights.accessrights http://purl.org/eprint/accessRights/RestrictedAccess en
pubs.subtype Article en
pubs.elements-id 784018 en
pubs.org-id Engineering en
pubs.org-id Civil and Environmental Eng en
pubs.record-created-at-source-date 2019-10-11 en
pubs.online-publication-date 2019-10-10 en


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