Engineering Approach for Predicting Fire Response of Restrained Steel Beams
Publication: Journal of Engineering Mechanics
Volume 137, Issue 7
Abstract
Predicting the response of restrained beams under fire conditions is complex owing to the development of fire-induced forces and requires finite-element or finite-differences analysis. In this paper, a simplified approach is proposed for predicting the fire-induced forces and deflections of restrained steel beams. The method applies equilibrium equations for obtaining critical fire-induced forces and then utilizes compatibility principles for obtaining temperature-deflection history of the beam. Effect of end restraints, thermal gradient, location of axial restraint force, span length, and load intensity are accounted for in the proposed approach. The validation of the approach is established by comparing the predictions from the proposed approach with results obtained from rigorous finite-element analysis. The applicability of the proposed approach to practical design situations is illustrated through a numerical example.
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Acknowledgments
The research presented in this paper is supported by the National Science Foundation (Grant No. NSF0652292) and Department of Commerce/National Institute of Standards and Technology (Grant No. NIST60NANB7D6120). Any opinions, findings, and conclusions or recommendations expressed in this paper are those of the writers and do not necessarily reflect the views of the sponsors.
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Information
Published In
Journal of Engineering Mechanics
Volume 137 • Issue 7 • July 2011
Pages: 447 - 461
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Oct 19, 2009
Accepted: Dec 14, 2010
Published online: Dec 16, 2010
Published in print: Jul 1, 2011
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