Response of Restrained Concrete Beams under Design Fire Exposure
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VIEW THE REPLYPublication: Journal of Structural Engineering
Volume 135, Issue 11
Abstract
Results from fire resistance experiments on six RC beams are presented in this paper. The test variables included concrete strength (permeability), support conditions, fire scenario, and load ratio. Data from fire tests are used to illustrate the comparative performance of high strength concrete (HSC) and normal strength concrete (NSC) beams under fire conditions. Also, data from the tests is used to validate a macroscopic finite-element model specifically developed for tracing the fire response of RC beams. Results from the tests and numerical studies show that HSC beams have lower fire resistance than that of NSC beams. It is also shown that HSC beams exhibit higher levels of spalling which is largely influenced by the permeability of concrete, type of fire exposure, load level, and restraint conditions. Similarly, the type of fire scenario, axial restraint, and load level have significant influence on the overall fire resistance of RC beams. These factors are to be considered for evaluating the fire resistance of RC beams under fire conditions.
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Acknowledgments
The research, presented in this paper, is primarily supported by the Michigan State University Foundation, through strategic partnership grant (Award No. UNSPECIFIEDSPG 71–4434), and the National Science Foundation CMMI program (Grant No. NSFCMMI 0601178).
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 135 • Issue 11 • November 2009
Pages: 1408 - 1417
Copyright
© 2009 ASCE.
History
Received: Oct 21, 2008
Accepted: Apr 6, 2009
Published online: Oct 15, 2009
Published in print: Nov 2009
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