Predicting the Effective Char Depth in Timber Elements Exposed to Natural Fires, Including the Cooling Phase

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F23%3A00367421" target="_blank" >RIV/68407700:21110/23:00367421 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.52202/069179-0226" target="_blank" >https://doi.org/10.52202/069179-0226</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.52202/069179-0226" target="_blank" >10.52202/069179-0226</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Predicting the Effective Char Depth in Timber Elements Exposed to Natural Fires, Including the Cooling Phase

Popis výsledku v původním jazyce

This paper presents a numerical study on the effect of the heating and cooling phases on the reduction of the effective cross-section of timber elements, in particular on the evolution of the char depth (300°C isotherm) and zerostrength layer. An advanced calculation method based a finite-difference heat transfer model is compared to the simplified approach suggested by Eurocode 5. For the heating phase, defined as the standard fire curve (ISO 834), the simplified Eurocode 5 method generally provides more conservative char depths, while the zero-strength layer is under-predicted. Nevertheless, the values of effective char depth are comparable. Including the cooling phase evidences that, during this phase, the heat wave penetration leads to a significant increase in the char depth and zero-strength layer. Particularly, this increase directly depends on the fire cooling rate: a slower cooling phase further reduces the effective cross-section of timber members. As a result, this research highlights how the heat wave penetration during the fire cooling phase can significantly reduce the load-bearing capacity of timber elements.

Název v anglickém jazyce

Predicting the Effective Char Depth in Timber Elements Exposed to Natural Fires, Including the Cooling Phase

Popis výsledku anglicky

This paper presents a numerical study on the effect of the heating and cooling phases on the reduction of the effective cross-section of timber elements, in particular on the evolution of the char depth (300°C isotherm) and zerostrength layer. An advanced calculation method based a finite-difference heat transfer model is compared to the simplified approach suggested by Eurocode 5. For the heating phase, defined as the standard fire curve (ISO 834), the simplified Eurocode 5 method generally provides more conservative char depths, while the zero-strength layer is under-predicted. Nevertheless, the values of effective char depth are comparable. Including the cooling phase evidences that, during this phase, the heat wave penetration leads to a significant increase in the char depth and zero-strength layer. Particularly, this increase directly depends on the fire cooling rate: a slower cooling phase further reduces the effective cross-section of timber members. As a result, this research highlights how the heat wave penetration during the fire cooling phase can significantly reduce the load-bearing capacity of timber elements.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20102 - Construction engineering, Municipal and structural engineering

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Proceedings from the 13th World Conference on Timber Engineering 2023

ISBN

9781713873297

ISSN

—

e-ISSN

—

Počet stran výsledku

10

Strana od-do

1681-1690

Název nakladatele

World Conference on Timber Engineering 2023

Místo vydání

—

Místo konání akce

Oslo

Datum konání akce

19. 6. 2023

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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