Charring of protected wood studs

Tsantaridis, Lazaros; Östman, Birgit

doi:10.1002/(sici)1099-1018(199803/04)22:2<55::aid-fam635>3.0.co;2-t

Cited by 22 publications

(9 citation statements)

References 4 publications

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“…In order to generate data to validate the predictions of the heat and mass transfer model, a series of tests were completed using the cone calorimeter [12]. The cone calorimeter was chosen as it has been shown to provide well-defined boundary conditions for a one-dimensional analysis of gypsum board/wood samples [13]. In this study, a sample consisted of two layers of 12.7 mm ( 1 2 in.)…”

Section: Experimental Programmentioning

confidence: 99%

Predicting the thermal response of gypsum board subjected to a constant heat flux

et al. 2008

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SUMMARYModels are available to predict the fire-resistance ratings of wood-frame assemblies protected by gypsum board. These models have been developed to predict the performance of assemblies exposed to a standard fire test in which temperatures increase monotonically. In an ongoing effort to model the fire resistance of light-frame wood floor assemblies, in this study, a number of improvements over past heat transfer models have been made in an attempt to simulate assembly performance in any arbitrary fire exposure. For this purpose, the heat transfer analysis has been coupled with a mass transfer analysis. The calcination of gypsum board and pyrolysis of wood are now modelled using an Arrhenius expression.In order to evaluate the accuracy of the model, a series of cone calorimeter experiments have been conducted in an effort to generate experimental data under well-defined boundary conditions. Comparisons between test results and the predictions from a one-dimensional heat and mass transfer analysis are encouraging with excellent agreement in predicting the point at which gypsum board is fully calcinated. A lack of material property data, particularly the permeability of gypsum board, remains a limiting factor in further improvement of the accuracy of the model.

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Section: Experimental Programmentioning

confidence: 99%

Predicting the thermal response of gypsum board subjected to a constant heat flux

et al. 2008

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“…A method for predicting the charring of protected wood studs in full-scale furnace wall tests on the basis of cone calorimeter data measured at 50 kW/m 2 was developed by Tsantaridis and Ö stman [28]. In a study of the protective ability of different gypsum plasterboards it was found that the time to the onset of charring is best predicted by using the board thickness as the prediction parameter, whereas the recommended prediction parameter for the charring rate is the weight per unit area of the boards [29].…”

Section: Charring and Fire Resistance Of Timbermentioning

confidence: 99%

“…In a study of the protective ability of different gypsum plasterboards it was found that the time to the onset of charring is best predicted by using the board thickness as the prediction parameter, whereas the recommended prediction parameter for the charring rate is the weight per unit area of the boards [29]. The data of [28] were also used by Silcock and Shields for correlating char depth to local fire severity [30].…”

Section: Charring and Fire Resistance Of Timbermentioning

confidence: 99%

Post-Flashover Fires in Light and Heavy Timber Construction Compartments

Hakkarainen

2002

Journal of Fire Sciences

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A series of fire experiments was performed to study the gas temperature development and charring behaviour of timber construction compartments. The measured gas temperatures were 300-500 C lower than predicted by the parametric temperature-time curves of Eurocode 1 for unprotected and insufficiently protected timber structures. For structures protected with a double layer of gypsum plasterboard, the agreement was better. In all cases, however, the prediction was on the safe side. One protective layer of gypsum plasterboard delayed the onset of charring for 20 min. Using two layers, the delay time was doubled. Reduced charring rates for long exposure times were observed, resulting from the increasingly protective effect of the char layer withtime.

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“…O Ostman and Tsantaridis in their work. 8,17 This value is calculated as the average density for the outer 10 mm of the exposed side of the specimen. The properties of the outer layer of a product play an important role in how the flame spreads over the surface.…”

Section: Effective Densitymentioning

confidence: 99%

Prediction of heat release in the single burning item test

Hansen

2002

Fire and Materials

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This paper presents a modification of an existing mathematical model that uses cone calorimeter test results to predict heat release rate in the single burning item (SBI) test. A method for classification of cases based on multivariate statistical analysis is incorporated in the modified model. This makes it possible to determine the development of the heat release curve in the SBI test with better precision than the original version was able to. The model has been applied to 100 cases of cone calorimeter test results from 33 different products. For most of the products the predicted shape and level of the heat release curves are close to measurements in the SBI test. Using the predicted heat release results as input to calculation of FIGRA 0.2MJ and THR 600s within the new European system for reaction-to-fire classification, we were able to predict membership of the correct class in 90% of the analysed cases.

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Charring of protected wood studs

Cited by 22 publications

References 4 publications

Predicting the thermal response of gypsum board subjected to a constant heat flux

Predicting the thermal response of gypsum board subjected to a constant heat flux

Post-Flashover Fires in Light and Heavy Timber Construction Compartments

Prediction of heat release in the single burning item test

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