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The reduced cross-section method for evaluation of the fire resistance of timber members: Discussion and determination of the zero-strength layer
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Hållbar Samhällsbyggnad.
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Hållbar Samhällsbyggnad. Tallinn University of Technology, Estonia.ORCID iD: 0000-0002-8001-401x
ETH Zurich, Switzerland.
University of Sassari, Italy.
2015 (English)In: Fire technology, ISSN 0015-2684, E-ISSN 1572-8099, Vol. 51, no 6, p. 1285-1309Article in journal (Refereed) Published
Abstract [en]

The reduced cross-section method (RCSM) is included in Eurocode 5 (EN-1995-1-2) for the design of timber members in fire conditions. The method considers the strength and stiffness reduction beneath the charred layer by adding an additional depth (known as the ‘zero-strength’ layer) to the charring depth. The zero-strength layer is one of the key parameters for the fire design of timber members. Recently, some concerns have been raised that the zero-strength layer might be non-conservative in some applications. This paper presents the background to the RCSM, followed by a short discussion on the mechanical assumptions, simplifications and possible limitations of the method itself. Further, it discusses determination of the zero-strength layer thickness for members in bending, tension and compression, and provides guidelines on the use of standard experimental tests to determine this quantity. For demonstration of the determination procedure, the results of fire tests in bending, tension and compression were analysed following the described procedure. Results show that the zero-strength layer exceeds the value used in practice, indicate that the method of Eurocode 5 may be non-conservative and should be revised.

Place, publisher, year, edition, pages
2015. Vol. 51, no 6, p. 1285-1309
Keywords [en]
Timber, Fire design, Zero-strength layer, Reduced, Cross-Section Method, Fire testing, Advanced calculation
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-6871DOI: 10.1007/s10694-014-0421-6Scopus ID: 2-s2.0-84945189214Local ID: 29383OAI: oai:DiVA.org:ri-6871DiVA, id: diva2:964712
Available from: 2016-09-08 Created: 2016-09-08 Last updated: 2023-05-08Bibliographically approved

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