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Predicting the thickness of zero-strength layer in timber beam exposed to parametric fires
ID
Huč, Sabina
(
Author
),
ID
Pečenko, Robert
(
Author
),
ID
Hozjan, Tomaž
(
Author
)
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https://www.sciencedirect.com/science/article/pii/S0141029620342097
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Abstract
In the design of timber structures, the mechanical resistance in fire conditions has to be ensured among others. In the European standards, Eurocodes, the reduced cross-section method is given to determine mechanical resistance of timber structural elements in fire conditions. The reduced cross-section method is based on an effective cross-section that is determined by two key parameters, namely the charring depth and the thickness of zero-strength layer where the latter accounts for the reductions of the stiffness and the strength of timber due to elevated temperatures. Although, the thickness of zero-strength layer of 7 mm is only prescribed for the ISO 834 standard fire exposure longer than 20 min in the Eurocodes, the same value is often used for non-standard fire exposures as well, which might not always be correct. Thus, in the present paper the thickness of zero-strength layer is investigated for a timber beam exposed to 44 different parametric fires by means of advanced numerical models and a simple design method. A hygro-thermal model and a mechanical model are applied to determine the temperature field over a timber beam cross-section and the mechanical resistance of the beam during fire exposure, respectively. The simple design method is based on the reduced cross-section method. The obtained results show that the thickness of zero-strength layer varies between 8.4 mm and 30.5 mm, which are substantially higher values than the value of 7 mm suggested in the Eurocodes for the standard fire exposure. The results also indicate that the thickness of zero-strength layer is not a constant value and should be written as a function of the parameters defining a parametric fire curve. Alternatively, the effective cross-section could be simply determined by finding the combined thickness of zero-strength layer and charring depth at temperature of about 90 °C.
Language:
English
Keywords:
charring depth
,
fire resistance
,
parametric fire
,
reduced cross-section method
,
timber beam
,
zero-strength layer
,
numerical modelling
,
hygro-thermal analysis
,
numerical model
,
thickness
Work type:
Article
Typology:
1.01 - Original Scientific Article
Organization:
FGG - Faculty of Civil and Geodetic Engineering
Publication status:
Published
Publication version:
Version of Record
Year:
2021
Number of pages:
11 str.
Numbering:
Vol. 229, art. 111608
PID:
20.500.12556/RUL-125118
UDC:
614.84:624.011.1:624.072.2
ISSN on article:
0141-0296
DOI:
10.1016/j.engstruct.2020.111608
COBISS.SI-ID:
42650371
Publication date in RUL:
04.03.2021
Views:
1537
Downloads:
212
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Record is a part of a journal
Title:
Engineering structures
Shortened title:
Eng. struct.
Publisher:
Elsevier
ISSN:
0141-0296
COBISS.SI-ID:
7750666
Licences
License:
CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:
http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:
The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Secondary language
Language:
Slovenian
Keywords:
debelina oglenenja
,
požarna odpornost
,
parametrični požar
,
metoda zmanjšanega prereza
,
leseni nosilec
,
debelina nenosilnega sloja
,
numerično modeliranje
Projects
Funder:
ARRS - Slovenian Research Agency
Project number:
Z2-8160
Name:
Modeliranje pirolize za določitev poškodovanosti lesa pri naravnem požaru
Funder:
ARRS - Slovenian Research Agency
Project number:
P2-0260
Name:
Mehanika konstrukcij
Funder:
Other - Other funder or multiple funders
Funding programme:
Republic of Slovenia, Ministry of Education, Science and Sport
Project number:
5441-2/2017/241
Acronym:
WOOLF
Funder:
EC - European Commission
Funding programme:
European Regional Development Fund
Acronym:
WOOLF
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