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Predicting the thickness of zero-strength layer in timber beam exposed to parametric fires
ID Huč, Sabina (Avtor), ID Pečenko, Robert (Avtor), ID Hozjan, Tomaž (Avtor)

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Izvleček
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.

Jezik:Angleški jezik
Ključne besede:charring depth, fire resistance, parametric fire, reduced cross-section method, timber beam, zero-strength layer, numerical modelling, hygro-thermal analysis, numerical model, thickness
Vrsta gradiva:Članek v reviji
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:FGG - Fakulteta za gradbeništvo in geodezijo
Status publikacije:Objavljeno
Različica publikacije:Objavljena publikacija
Leto izida:2021
Št. strani:11 str.
Številčenje:Vol. 229, art. 111608
PID:20.500.12556/RUL-125118 Povezava se odpre v novem oknu
UDK:614.84:624.011.1:624.072.2
ISSN pri članku:0141-0296
DOI:10.1016/j.engstruct.2020.111608 Povezava se odpre v novem oknu
COBISS.SI-ID:42650371 Povezava se odpre v novem oknu
Datum objave v RUL:04.03.2021
Število ogledov:1107
Število prenosov:190
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Gradivo je del revije

Naslov:Engineering structures
Skrajšan naslov:Eng. struct.
Založnik:Elsevier
ISSN:0141-0296
COBISS.SI-ID:7750666 Povezava se odpre v novem oknu

Licence

Licenca:CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
Povezava:http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
Opis:Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.

Sekundarni jezik

Jezik:Slovenski jezik
Ključne besede:debelina oglenenja, požarna odpornost, parametrični požar, metoda zmanjšanega prereza, leseni nosilec, debelina nenosilnega sloja, numerično modeliranje

Projekti

Financer:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Številka projekta:Z2-8160
Naslov:Modeliranje pirolize za določitev poškodovanosti lesa pri naravnem požaru

Financer:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Številka projekta:P2-0260
Naslov:Mehanika konstrukcij

Financer:Drugi - Drug financer ali več financerjev
Program financ.:Republic of Slovenia, Ministry of Education, Science and Sport
Številka projekta:5441-2/2017/241
Akronim:WOOLF

Financer:EC - European Commission
Program financ.:European Regional Development Fund
Akronim:WOOLF

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