Charring of Timber – Determination of the Residual Virgin Cross Section and Charring Rates
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Date
2021
Publication Type
Conference Paper
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yes
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Abstract
For the assessment of the fire resistance of timber members, the virgin wood has to be documented for a proper evaluation of any fire test result. However, actual fire resistance standards disregard the need to document the virgin cross-section. Numerous ad-hoc methods appeared around the world in labs and research facilities comprising a variety of methods from single ruler measurements to the determination of the virgin cross-section with temperature measurements. Especially for plane members such as cross-laminated timber (CLT), old-fashioned measurements as well as applied temperature measurements fail due to several reasons discussed in this paper, i.e. the variability of results and the misleading temperature measurements due to wrongly installed thermocouples. Following the advances in digital image processing, it is proposed to consequently apply these novel techniques for the measurement of the charring of timber, which is an essential input for the verification of the fire resistance and the development of future calculation models. Final recommendations base on the type of specimen (linear or plane member) and the test environment. For plane members such as CLT, 3D-image processing using photography is recommended for further use. For labs not having access to advanced techniques and required knowhow, a methodology for a minimum number of manual measurements has developed and presented in this paper.
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published
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Book title
World Conference on Timber Engineering (WCTE 2021)
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Volume
Pages / Article No.
1081 - 1089
Publisher
Curran
Event
2021 World Conference on Timber Engineering (WCTE 2021)
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Software
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Date created
Subject
Fire; Timber; Charring; image processing; measurements; char-depth
Organisational unit
08809 - Frangi, Andrea (Tit.-Prof.)