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Thickness of zero-strength layer in timber beam exposed to fuel-controlled parametric fires
ID Huč, Sabina (Avtor), ID Hozjan, Tomaž (Avtor), ID Pečenko, Robert (Avtor)

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Izvleček
Fire resistance is one of the essential requirements to be fulfilled in the design of timber structures. For this purpose, a reduced cross-section method is given in the European standards, Eurocodes. The method is based on the assumption that an initial, rectangular timber cross-section exposed to fire conditions reduces to an effective cross-section, which has material properties as at a room temperature. The reduced part of the cross-section with no resistance is determined by a sum of two parameters, namely a charring depth and a thickness of zero-strength layer. Eurocodes give a value of the latter only for the standard fire exposure, which is only one of the fire curves proposed in the same standards. Therefore, the present paper examines the thickness of zero-strength layer in case of 46 different fuel-controlled parametric fire exposures applied to a timber beam from three sides. A four-phase numerical analysis is applied for this purpose that includes the use of a hygro-thermal model and a mechanical model to determine temperatures of timber over the cross-section and the mechanical resistance of timber beam in fire conditions, respectively. The results show that the thickness of zero-strength layer takes the values between 7.9 and 18.4 mm for the fuel-controlled parametric fire exposures. Since it is clearly dependent on the parameters describing the parametric fire curve, five equations are proposed that can be used for determination of the thickness of zero-strength layer in case of parametric fire exposures.

Jezik:Angleški jezik
Ključne besede:zero-strength layer, parametric fire, timber beam
Vrsta gradiva:Članek v reviji
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:FGG - Fakulteta za gradbeništvo in geodezijo
FKKT - Fakulteta za kemijo in kemijsko tehnologijo
Status publikacije:Objavljeno
Različica publikacije:Objavljena publikacija
Leto izida:2023
Št. strani:Str. 929-944
Številčenje:Vol. 57, iss. 4
PID:20.500.12556/RUL-151732 Povezava se odpre v novem oknu
UDK:624.011.1:624.072.2:614.84
ISSN pri članku:0043-7719
DOI:10.1007/s00226-023-01480-8 Povezava se odpre v novem oknu
COBISS.SI-ID:160140291 Povezava se odpre v novem oknu
Datum objave v RUL:18.10.2023
Število ogledov:169
Število prenosov:27
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Gradivo je del revije

Naslov:Wood science and technology
Skrajšan naslov:Wood sci. technol.
Založnik:Springer Nature, International Academy of Wood Science
ISSN:0043-7719
COBISS.SI-ID:9151749 Povezava se odpre v novem oknu

Licence

Licenca:CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
Povezava:http://creativecommons.org/licenses/by/4.0/deed.sl
Opis:To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

Jezik:Slovenski jezik
Ključne besede:debelina nenosilnega sloja, parametrični požar, leseni nosilec

Projekti

Financer:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Številka projekta:N2-0183
Naslov:Stohastični model oglenenja lesa v pogojih naravnega požara

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

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