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Geometric and material nonlinear analysis of imperfect circular hollow section (CHS) columns : steeel tubes and concrete filled tubes
Advisor(s)
Abstract(s)
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.
Description
Keywords
Nonlinear analysis
Pedagogical Context
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