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Title: Geometric and material nonlinear analysis of imperfect circular hollow section (CHS) columns : steeel tubes and concrete filled tubes
Author: Gonçalves, G.
Barros, R.C.
Braz-César, M.T.
Keywords: Nonlinear analysis
Issue Date: 2009
Citation: Gonçalves, G.; Barros, R.C.; Braz-César, M.T.(2009) - Geometric and material nonlinear analysis of imperfect circular hollow section (CHS) columns : steeel tubes and concrete filled tubes. In IRF2009 - 3rd International Conference on Integrity, Reliability and Failure. Porto, Portugal. ISBN 978-972-8826-21-5
Abstract: The comparison between theoretical predictions and design curve predictions of the critical stresses, for a wide range of slenderness ratio, is valid and useful. For columns made of steel S235 with initial deformations and slenderness below about 60, columns capacity is controlled by elastic-plastic resistant and performance, as the slenderness decreases (until the minimum limit, controlled by crushing or plastic squash). For columns with slenderness above 60, columns capacity tends to be controlled by elastic instability as slenderness increases. For the used steel S235, in the dimensionless plot of critical stress divided by steel yield stress versus slenderness, the parametric effect of the end-eccentricities is only slightly significant for slenderness between 40 to 80. Rankine-Gordon formula provides conservative safe estimates of the resistant column capacity. The results of the tests of composite columns reveal some of the strength advantage of using composite construction over traditional steel constructions. They also show the importance of top end eccentricities in the results, and the need to ascertain their value with accuracy of about 1-2 mm. Some resistant capacity gains as well as some ductility reductions, are given in tabular form; reasons for possible discrepancy of results are mentioned. The interaction equation for circular section tubes is introduced, and the Merchant-Rankine formula (and its modification) is justified through an example.
Peer review: yes
ISBN: 978-972-8826-21-5
Appears in Collections:DMA - Artigos em Proceedings Não Indexados ao ISI/Scopus

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