Predicting the thickness of zero-strength layer in timber beam exposed to parametric fires

Huč, Sabina (author), Pečenko, Robert (author), Hozjan, Tomaž (author)

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

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