Fire Resistance of Unprotected Steel Columns

by W. W. Stanzak, Steel Industries Fellow; Fire Res. Sect., Div. of Bldg. Res., Natl. Res. Council of Canada, Ottawa, Canada,
T. T. Lie, Res. Ofcr.; Fire Res. Sect., Div. of Bldg. Res., Natl. Res. Council of Canada, Ottawa, Canada,


Serial Information: Journal of the Structural Division, 1973, Vol. 99, Issue 5, Pg. 837-852


Document Type: Journal Paper

Discussion: Kamath C. M. (See full record)

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.

Subject Headings: Fire resistance | Steel columns | Load and resistance factor design | Failure analysis | Thermal properties | Numerical analysis | Thermal analysis

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