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Research Article
Effect of increased charring on the narrow side of rectangular timber cross-sections exposed to fire on three or four sides
Article first published online: 23 JAN 2011
DOI: 10.1002/fam.1078
Copyright © 2011 John Wiley & Sons, Ltd.
Additional Information
How to Cite
Frangi, A. and König, J. (2011), Effect of increased charring on the narrow side of rectangular timber cross-sections exposed to fire on three or four sides. Fire Mater., 35: 593–605. doi: 10.1002/fam.1078
Publication History
- Issue published online: 16 NOV 2011
- Article first published online: 23 JAN 2011
- Manuscript Accepted: 28 OCT 2010
- Manuscript Revised: 25 AUG 2010
- Manuscript Received: 11 MAY 2010
- Abstract
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Keywords:
- structural fire design;
- charring;
- charring rate;
- mechanical resistance;
- thermal analysis;
- fire tests
Abstract
Owing to the influence of two-dimensional heat transfer, fire tests and heat transfer calculations show that charring on the narrow side of rectangular timber cross-sections may be considerably greater than charring on the wide side. For timber members unprotected throughout the time of fire exposure as well as members initially protected from fire exposure, it is shown by calculation, that the relationship between charring on the narrow side and time is nonlinear. In order to take into account increased charring on the narrow side of timber members a section factor ks was determined. By calculation it is shown that bending moment resistance is only insignificantly influenced by the effect of two-dimensional heat transfer and the factor ks can therefore be neglected, making the fire design of timber members easier. Copyright © 2011 John Wiley & Sons, Ltd.