An approach for calculating the failure loads of unprotected concrete filled steel columns exposed to fire

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TypeArticle
Journal titleStructural Engineering and Mechanics
Volume7
IssueFebruary 2
Pages127145; # of pages: 19
SubjectConcrete columns; Concrete
AbstractThis paper deals with the development of an approach for evaluating the squash load andrigidity of unprotected concrete filled steel columns at elevated temperatures. The current approach of evaluating these properties is reviewed. It is shown that with a non-uniform temperature distribution, over the composite cross-section, the calculations for the squash load and rigidity are tedious in the current method. A simplified approach is proposed to evaluate the temperature distribution, squash load, and rigidity of composite columns. This approach is based on the model in Eurocode 4 and can conveniently be used to calculate the resistance to axial compression of a concrete filled steel column for any fire resistance time. The accuracy of the proposed approach is assessed by comparing the predicted strengths against the results of fire tests on concrete filled circular and square steel columns. The applicability of the proposed approach to a design situation is illustrated through a numerical example
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number39850
9532
NPARC number20331218
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Record identifierff22af15-a697-4e5f-a0af-5a585effd628
Record created2012-07-18
Record modified2016-05-09
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