Behavior of Concrete-Filled Circular, Square, Rectangular, and Elliptical Hollow Columns Subjected to Fire
Publication: Journal of Structural Engineering
Volume 144, Issue 6
Abstract
This paper presents and discusses the results of experiments on the behavior of composite columns made of concrete-filled hollow sections subjected to fire and restrained thermal elongation. Several parameters that may influence the behavior of such columns in case of fire were tested, such as: slenderness, cross-sectional shape, and restraint caused by the surrounding structure on the column subjected to fire. In fire resistance tests, specimens were subjected to the standard fire curve, and critical time, critical temperature, and corresponding buckling modes were assessed. The experimental results were also compared with results from available analytical models to determine whether they are safe and consistent for fire design. Finally, the results showed that column fire resistance may not be significantly affected by the stiffness of the surrounding structure, and that the simplified calculation method for the fire design of concrete-filled hollow sections presented in Annex H of Eurocode 4 part 1.2 is unsafe, except for elliptical columns.
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Acknowledgments
The authors would like to thank the European Union and the Research Fund for Coal and Steel (RFCS), for the support under the research project FRISCC (RFSR-CT-2012-00025).
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 144 • Issue 6 • June 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Oct 7, 2016
Accepted: Nov 13, 2017
Published online: Mar 19, 2018
Published in print: Jun 1, 2018
Discussion open until: Aug 19, 2018
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