Postbuckling Behavior of Axially Restrained and Axially Loaded Steel Columns under Fire Conditions
Publication: Journal of Structural Engineering
Volume 130, Issue 3
Abstract
This paper presents the results of a theoretical study of the postbuckling behavior of an axially loaded steel column at elevated temperatures whose thermal expansion is restrained by the adjacent structural members. This study investigates the effects on the column failure temperature by various factors, including the restraint stiffness during the column loading (expansion) and unloading (contraction) phases, column slenderness, and the initially applied column load ratio. The column failure temperature is defined as the temperature at which the load in the column during the postbuckling phase returns to its initial load. Results of this study indicate that the column failure temperature can be much higher than that of the column at first buckling and the higher the column slenderness, the larger the difference between temperatures of column failure and first buckling. Consequently, the column postbuckling behavior should be considered. Nevertheless, for columns with light restraints (restraint stiffness to column stiffness less than 5%) or high load ratios (load ratio higher than 0.5), the failure temperature of the column with realistic unloading stiffness of the restraint is only slightly affected by the postbuckling behavior.
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Information
Published In
Journal of Structural Engineering
Volume 130 • Issue 3 • March 2004
Pages: 371 - 380
Copyright
Copyright © 2004 American Society of Civil Engineers.
History
Received: Oct 16, 2001
Accepted: Mar 24, 2003
Published online: Feb 19, 2004
Published in print: Mar 2004
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