Analytical Fire Resistance of Axially Restrained Steel Columns
Publication: Journal of Structural Engineering
Volume 129, Issue 11
Abstract
Using the standard fire resistance test to predict the fire resistance of a steel column is expensive and time consuming as well. On the other hand, numerical approximation using the finite element method assumes the availability of a nonlinear elastoplastic analysis software. This approach is not necessarily accurate as it does not explicitly take creep into account. As an alternative, theoretical analysis that can be performed manually is a convenient tool for engineers to quickly assess the column fire resistance. This study extends the traditional Rankine formula to the critical temperature prediction of an axially restrained steel column. A linear spring attached to the column top end accounts for the axial restraint of upper-story structure on the isolated heated column. The proposed Rankine approach incorporates both the axial restraint and creep strain. Comparison of test and numerical results using self-developed viscoelastoplastic analysis shows that the proposed Rankine formula yields very good column critical temperatures. Most importantly, it shows that axial restraint can significantly reduce the fire resistance of a column based on the adopted failure criterion.
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Copyright © 2003 American Society of Civil Engineers.
History
Received: May 21, 2002
Accepted: Nov 12, 2002
Published online: Oct 15, 2003
Published in print: Nov 2003
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