A model for predicting heat transfer through gypsum‐board/wood‐stud walls exposed to fire

Mehaffey, J. R.; Cuerrier, P.; Carisse, G.

doi:10.1002/fam.810180505

Cited by 174 publications

(229 citation statements)

References 5 publications

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“…Cuerrier, 27 Mehaffey et al, 28 Mehaffey and Takeda gypsum-protected wood stud walls exposed to simulated office compartment fires.…”

Section: Existing Modelsmentioning

confidence: 99%

“…Thomas 37 reported the following equation, used by Gammon, 25 Janssens 60 and Mehaffey et al, 28 to determine the specific heat of wood:…”

Section: Thermal Properties Of Woodmentioning

confidence: 99%

“…Mehaffey et al 28 assumed that this evaporation occurs between 100°C and 120°C, while Janssens 60 assumed that it occurs between 100°C and 160°C.…”

Section: Moisture Content In Woodmentioning

confidence: 99%

“…This variation is in part due to the fact that the chemical formulation of the gypsum core varies from product to product, and that the method used to measure or obtain the thermal conductivity may also differ. The values from Anderson et al 63 are based on measurements conducted using the Transient Hot Strip method, while the values reported by Mehaffey et al 28 and Harmathy 57 are from measurements performed at NRC using the TC-31 thermal conductivity meter. The curves shown for Thomas 37 , Mehaffey et al 28 (as used), and Takeda and Mehaffey 29 are modified curves used to provide good calibration between measured and calculated temperatures within woodstud wall assemblies.…”

Section: Thermal Properties Of Gypsum Wallboardmentioning

confidence: 99%

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Bénichou

Sultan

2000

Fire Technology

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1023/A:1015414827695Fire Technology, 36, 3, pp. 184-219, 2000-08-01 Fire resistance performance of lightweight wood-framed assemblies Bénichou, N.; Sultan, M. A. Council of Canada (NRC), to develop fire resistance models. NRC is currently developing thermal and structural models for lightweight wood-framed assemblies, in collaboration with the Canadian wood industry. These models will be used in NRC's risk-cost assessment models as well as in the development of fire resistance design equations. To aid the development of fire resistance models, NRC has just completed, as a first step, a literature review on the efforts made to predict the fire resistance of lightweight wood-framed assemblies, with the objective of determining the gaps that need to be filled. This paper presents the results of this literature review, which include: standard versus real time-temperature fire curves, experimental studies, available fire resistance models and design methods and the identification of their limitations, charring of wood, and material properties of assembly components at elevated temperatures.

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“…Cuerrier, 27 Mehaffey et al, 28 Mehaffey and Takeda gypsum-protected wood stud walls exposed to simulated office compartment fires.…”

Section: Existing Modelsmentioning

confidence: 99%

“…Thomas 37 reported the following equation, used by Gammon, 25 Janssens 60 and Mehaffey et al, 28 to determine the specific heat of wood:…”

Section: Thermal Properties Of Woodmentioning

confidence: 99%

“…Mehaffey et al 28 assumed that this evaporation occurs between 100°C and 120°C, while Janssens 60 assumed that it occurs between 100°C and 160°C.…”

Section: Moisture Content In Woodmentioning

confidence: 99%

Section: Thermal Properties Of Gypsum Wallboardmentioning

confidence: 99%

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Untitled

Bénichou

Sultan

2000

Fire Technology

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“…A number of models have been developed in the past 15 years that predict the response of a wood-frame assembly to the standard fire resistance test [4][5][6][7]. The main challenge in modelling wood assemblies protected by gypsum board is the lack of robust material property data for wood and gypsum board at elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

Modelling Heat And Mass Transfer In Wood-Frame Floor Assemblies Exposed To Fire

Craft¹,

Isgor²,

Mehaffey³

et al. 2008

Fire Saf. Sci.

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A two-dimensional finite-element model has been developed to simulate the heat and mass transfer in both gypsum board and wood in order to predict the thermal response of a wood-frame floor assembly exposed to fire. Both volatile pyrolysis products in wood and water vapour in wood and gypsum board are considered in the mass transfer analysis. Calcination of gypsum board and pyrolysis of wood are modelled using Arrhenius expressions. The evaporation of water is modelled assuming the partial pressure of water is equal to the equilibrium vapour pressure. The gas in the cavity is assumed to be fully transparent, allowing radiant heat transfer between all surfaces in the cavity, thus leaving convective heat transfer to heat the gas inside the cavity.Comparisons are made to two full-scale fire resistance tests. One test was carried out using the standard temperature exposure while the second test used a non-standard exposure that was based on measurements taken in experimental fires in wood frame houses. Comparisons between experiment and model predictions show good agreement on the unexposed side of each of the two layers of gypsum board protecting the assembly. The cavity temperature is under-predicted resulting in an under-prediction of the temperatures in the floor joist and sub-floor. The model currently does not account for the fall-off of gypsum board which limits the models ability to predict the results for the non-standard exposure since the gypsum board failed very early in the test. KEYWORDS

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Charring of protected wood studs

Tsantaridis

Östman

1998

Fire Mater.

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A model for predicting heat transfer through gypsum‐board/wood‐stud walls exposed to fire

Cited by 174 publications

References 5 publications

Untitled

Untitled

Modelling Heat And Mass Transfer In Wood-Frame Floor Assemblies Exposed To Fire

Charring of protected wood studs

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