Fire Protection Provided by Insulation Materials—A New Design Approach for Timber Frame Assemblies

Tiso, Mattia; Just, Alar

doi:10.2749/101686617x14881932435899

Cited by 5 publications

(17 citation statements)

References 0 publications

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Section: Improved Design Model For Tfamentioning

confidence: 99%

“…The improved design model for TFA proposed by Tiso and Just considers 3 different charring scenarios with cavities completely filled with insulations. The following scenarios are generally possible to consider: If the cavities are completely filled with cavity insulation qualified as PL1, charring occurs mainly on the fire‐exposed side of the timber member, while the lateral sides are protected by the cavity insulation (Figure B). The definitions of the fire‐exposed side and lateral sides of the timber cross section are shown in Figure . If the cavities are completely filled with cavity insulation qualified as PL2, charring is regarded from 1 side during the protection phase and from 3 sides of the timber cross section during the postprotection phase. If the cavities are completely filled with cavity insulation qualified as PL3, charring is regarded from 3 sides of the cross section already during the protection phase. …”

Section: Improved Design Model For Tfamentioning

confidence: 99%

“…According to the current Eurocode 5 Part 1‐2, the position of the char line is considered as the position of the 300°C isotherm . Different protective performances of the insulation materials may be distinguished by the speed with which the 300°C isotherm on the interface between wood and insulation ( d 300,s ) moves during the postprotection phase …”

Section: Determination Of the Charring Coefficientsmentioning

confidence: 99%

“…A, Improved design model for timber frame assemblies. B, Different charring phases of the design model [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Introductionmentioning

confidence: 99%

“…An improved design approach including a wider range of insulation products was presented by authors of this paper . The study was based on 8 different batt‐type insulation materials.…”

Section: Introductionmentioning

confidence: 99%

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Effective cross‐sectional method for timber frame assemblies—definition of coefficients and zero‐strength layers

et al. 2018

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Summary The load‐bearing capacity of timber members in fire conditions can be evaluated by an analytical design model known as effective cross‐sectional method (ECSM). For this method, an effective cross section of a member in fire is calculated by decreasing the original cross section by a notional charring depth and a so‐called zero‐strength layer. Then, the load‐bearing capacity can be evaluated by applying the mechanical properties as at ambient temperature to this effective cross section. The ECSM for timber frame assemblies (TFA) exposed to standard fire conditions according to European Norm 1363‐1 has been presented earlier in the European technical guideline Fire Safety in Timber Buildings (FSITB) with a limited field of application. This design model considers the fire protection provided by claddings and a limited range of cavity insulations. To cover the fire protection of a wider range of cavity insulation products, a new design approach has been developed. In this study, the zero‐strength layers for TFA with different cavity insulations are determined by means of a series of thermal and mechanical simulations. This paper proposes the protection coefficient for TFA with generic stone wool products as cavity insulation and zero‐strength layers for TFA with different cavity insulations.

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Section: Improved Design Model For Tfamentioning

confidence: 99%

Section: Improved Design Model For Tfamentioning

confidence: 99%

Section: Determination Of the Charring Coefficientsmentioning

confidence: 99%

“…A, Improved design model for timber frame assemblies. B, Different charring phases of the design model [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Introductionmentioning

confidence: 99%

“…An improved design approach including a wider range of insulation products was presented by authors of this paper . The study was based on 8 different batt‐type insulation materials.…”

Section: Introductionmentioning

confidence: 99%

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Effective cross‐sectional method for timber frame assemblies—definition of coefficients and zero‐strength layers

et al. 2018

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Experimental Study of the Charring of I-Joists and Recession of Combustible Insulation in Light Timber Frame Assemblies with Comparison to Eurocode 5

Bøe,

Mäger,

Friquin

et al. 2023

Fire Technol

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Design models are commonly used in fire safety design of light timber frame assemblies. Parameters for use in the models are available for rectangular members with mineral wool, wood fibre or cellulose insulation and for assemblies with I-joists and mineral wool. For assemblies where I-joists and combustible insulations are combined, design parameters are missing. Five fire experiments with two I-joist types and four combustible insulation products have been conducted. The aim was to study charring of I-joist flanges and recession rates of combustible insulations and in addition, to compare their behaviour to the new and existing models of Eurocode 5. Charring rates for the flanges were 0.40–0.76 mm/min and 0.54–1.72 mm/min for the protected and post-protected phase, respectively. Rates decreased with increasing flange size. Charring rates for flanges of solid wood and LVL were comparable. The results show that lateral charring of I-joist flanges can be significant in the protected phase. The tested insulation products showed a lower recession rate than values reported for glass wool insulation, with a more pronounced difference for wood fibre and cellulose insulations. The low recession rates compared to previously reported generic values can possibly be explained by better product-specific properties, negligible shrinking and slightly different test set-up. The insulation stayed well in place after gypsum board fall-off and best-practice for keeping the insulation in place is given. The results, completed with future loaded full-scale tests, can give basis for further development of design models for assemblies with I-joists and combustible insulations.

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Evaluation of zero-strength layer depths for timber members of floor assemblies with heat resistant cavity insulations

Tiso

Just

Schmid

et al. 2019

Fire Safety Journal

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Fire Protection Provided by Insulation Materials—A New Design Approach for Timber Frame Assemblies

Cited by 5 publications

References 0 publications

Effective cross‐sectional method for timber frame assemblies—definition of coefficients and zero‐strength layers

Effective cross‐sectional method for timber frame assemblies—definition of coefficients and zero‐strength layers

Experimental Study of the Charring of I-Joists and Recession of Combustible Insulation in Light Timber Frame Assemblies with Comparison to Eurocode 5

Evaluation of zero-strength layer depths for timber members of floor assemblies with heat resistant cavity insulations

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