Compression tests on back-to-back gapped built-up cold-formed steel channel sections

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dc.contributor.author Roy, Krishanu en
dc.contributor.author Ting, TCH en
dc.contributor.author Lau, HH en
dc.contributor.author Lim, James en
dc.coverage.spatial Hong Kong, China en
dc.date.accessioned 2019-05-28T04:10:09Z en
dc.date.issued 2018-09-07 en
dc.identifier.uri http://hdl.handle.net/2292/46710 en
dc.description.abstract In Cold-formed steel structures, such as trusses, space frames and portal frames, the use of back-to-back gapped built-up Cold-formed steel channel-sections for column members are becoming increasingly popular. Because of the complex and non-uniform cross section of the back-to-back gapped built- up CFS channel columns, it is difficult to calculate the strength of these sections accurately. Current guidance by direct strength method in the AISI Specification and Australian/New Zealand Standard doesn’t include the gap between the back-to-back channels, thus not being able to predict the axial capacities of these sections accurately. In the literature, very few results are available for such columns and specially investigated the effect of link-channel’s spacing on axial strength of such columns. This issue is addressed herein. The results of 40 experimental tests are reported, conducted on back-to-back gapped built-up CFS channel-sections, covering stub to slender columns. Axial capacity of the columns and load-axial shortening were measured in the tests and reported. The failure modes and deformed shapes were observed. Also, the effect of link-channel’s spacing on axial strength, is investigated. The test strengths are compared against the design strengths calculated in accordance with AISI and Australian/New Zealand standard for CFS structures. It is shown that the design standards can be conservative by as much as 53%, while predicting axial strength of such columns. Therefore, a modification to the non-dimensional slenderness, that considers the gap, is proposed which leads the design standards being within 5% conservative to the test results. en
dc.description.uri https://www.polyu.edu.hk/cee/images/ICSC2018-Event_Report_Eng.pdf en
dc.relation.ispartof International Conference on Engineering Research and Practice for Steel Construction 2018 (ICSC2018) 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 Compression tests on back-to-back gapped built-up cold-formed steel channel sections en
dc.type Conference Item en
dc.rights.holder Copyright: The author en
pubs.finish-date 2018-09-07 en
pubs.start-date 2019-09-05 en
dc.rights.accessrights http://purl.org/eprint/accessRights/RestrictedAccess en
pubs.subtype Conference Paper en
pubs.elements-id 769137 en
pubs.org-id Engineering en
pubs.org-id Civil and Environmental Eng en
pubs.record-created-at-source-date 2019-04-22 en
pubs.online-publication-date 2018-09-07 en


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