Research Article
May 1973

Fire Resistance of Unprotected Steel Columns

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Publication: Journal of the Structural Division
Volume 99, Issue 5

Abstract

Fire resistance of unprotected steel columns is examined by standard fire test and numerical analyses based on a 1,000 D F (538 D C) critical temperature for failure. It is shown that fire resistance time varies with the shape factor of column weight divided by the heated perimeter, and two simple equations for calculating the fire resistance times of unprotected steel columns are established. A practical example shows that large columns used in high-rise buildings can have fire resistance times of up to one hr. The more conservative of the two equations is recommended for use in building standards.

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Journal of the Structural Division
Volume 99Issue 5May 1973
Pages: 837 - 852

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Published in print: May 1973
Published online: Feb 1, 2021

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W. W. Stanzak
Steel Industries Fellow, Fire Research Sect., Div. of Building Research, National Research Council of Canada, Ottawa, Canada
T. T. Lie
Research Officer, Fire Research Sect., Div. of Building Research, National Research Council of Canada, Ottawa, Canada

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