Determination of the steel fire protection material thickness by an analytical process—a simple derivation

Silva, Valdir Pignatta e

doi:10.1016/j.engstruct.2005.05.018

Cited by 25 publications

(15 citation statements)

References 1 publication

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“…As shown in Figure 4, when insulated by gypsum board, for all sections temperature -time curves given by EC3 [4], ECCS [5] and Silva [12] fit well. CECS200 [7] and SFPE handbook [6] give the same results which fit well with the results given by EC3, ECCS and Silva at late heating stage but safely deviate from those results at early and mid heating stage.…”

Section: Resultsmentioning

confidence: 69%

“…As shown in Figure 3, when insulated by SFRMs, for all sections steel temperature -time curves given by EC3 [4], ECCS [5], CECS200 [7] and Silva [12] fit very well. Curves given by SFPE handbook [6] and Pettersson et al [20] deviate from curves given by other four formulations.…”

Section: Resultsmentioning

confidence: 74%

“…In practice, Dirichlet boundary condition has been widely adopted in deriving temperature formulations for uniformly insulated steel members [4,7,9,12], which is given by…”

Section: Governing Equation and Boundary Conditionsmentioning

confidence: 99%

“…Three steel I sections with different section factors insulated by typical nonreactive fire protection materials which are normal weight concrete (NWC), gypsum board and SFRMs are investigated. The mean steel temperature calculated by CECS200 [7], EC3 [4], ECCS [5], SFPE handbook [6] and Silva [12] are compared with the numerical results from the popular FEM program ANSYS [14]. ANSYS is power to solve transient, non-linear heat transfer problems.…”

Section: Figure 1 1d Heat Transfer Modelmentioning

confidence: 99%

“…In references [10] and [11], both Dirichlet and Neumann boundary conditions can be considered. Assuming Dirichlet boundary condition, Silva [12] derives a simple formulation of the problem which has been recommended for the revision of the Brazilian Standard 14323 [13].…”

Section: Introductionmentioning

confidence: 99%

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Thermal Response to Fire of Uniformly Insulated Steel Members: Background and Verification of the Formulation Recommended by Chinese Code Cecs200

Li¹,

Zhang²

2010

Volume 6 Number 2

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Currently, Chinese technical code for fire safety of steel structures in buildings (CECS200) is being revised. This paper intends to give the background of the recommended formulation in CECS200 for temperature calculation of uniformly insulated steel members. Analytical formulations recommended by other codes including EC3, ECCS, SFPE handbook, etc.., and FE method are used for comparison and verification. Theoretical derivation of the exact analytical formulations is also given. Two boundary conditions at the fire-insulation interface have been discussed in the derivation. By investigating the steel temperature of three insulated sections with different section factors which are protected by typical fire protection materials, the formulation recommended by CECS200 is proved to be reasonable and simple for engineering usage.

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Section: Resultsmentioning

confidence: 69%

Section: Resultsmentioning

confidence: 74%

“…In practice, Dirichlet boundary condition has been widely adopted in deriving temperature formulations for uniformly insulated steel members [4,7,9,12], which is given by…”

Section: Governing Equation and Boundary Conditionsmentioning

confidence: 99%

Section: Figure 1 1d Heat Transfer Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Thermal Response to Fire of Uniformly Insulated Steel Members: Background and Verification of the Formulation Recommended by Chinese Code Cecs200

Li¹,

Zhang²

2010

Volume 6 Number 2

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Calculation of thermal conductivity of gypsum plasterboards at ambient and elevated temperature

Korte

Brouwers

2009

Fire and Materials

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SUMMARYPlasterboard often protects steel structures of buildings because it conducts heat slowly and absorbs the heat of the fire by its volumetric enthalpy. The most important property governing the heat transfer is the thermal diffusion. This property depends on the density, specific heat and thermal conductivity. The first two can be calculated based on the mass composition of the board. The thermal conductivity is more difficult to derive since it is a directional property. This paper will focus on the calculation of the thermal conductivity at ambient and elevated temperatures.It is shown that the thermal conductivity of gypsum plasterboard (i.e. a porous medium) can be assumed to be a three-phase system. Plasterboard consists of a solid phase and a water/air mix in the voids. The differences between different theoretical equations for both dry and moistured plasterboards are presented. The equation proposed by Zehner and Schlunder (Chem. Ing.-Tech. 1972; 44(23):1303-1308) with shape-factor C of 5 gave good agreement with experimental data of the different boards. Furthermore, the influence of the composition of the boards on the thermal conductivity is investigated. This has an influence, especially since the composition is also related to its moisture content. Regression analysis * Correspondence to: A. C. J. points out that the moisture content depends only on the gypsum content. A value of 2.8% absorbed water on the mass of gypsum is found, and this water plays an important role in the thermal conductivity of plasterboard at ambient temperature.Finally, the thermal conductivity of board at elevated temperature is computed. A close fit between computed and experimental values derived from literature is found.

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A simplified calculation method for temperature evaluation of steel columns embedded in walls

2010

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SUMMARYSteel elements behave differently in fire case when isolated or embedded in building walls. The walls on one hand have a favorable effect protecting the elements from the excessive heating resulting from the fire and on the other hand they have a detrimental effect due to the thermal gradients originated in the elements cross-section. The simplified calculation methods proposed in EN 1993-1-2 for fire design do not take into account the case of steel elements embedded in walls, stipulating only a formulation for the assessment of the resistance for uniform temperature distribution. This paper presents a proposal of a new simplified calculation method to evaluate the temperature of steel columns embedded in walls. The method is based on numerical simulations and fire resistance tests. Steel columns totally or partially embedded in walls, with the web perpendicular or parallel to the wall surface, were tested.In the study it was also observed that thicker walls or H steel columns with the web perpendicular to the wall surface provide greater thermal gradients in the cross-sections.

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Determination of the steel fire protection material thickness by an analytical process—a simple derivation

Cited by 25 publications

References 1 publication

Thermal Response to Fire of Uniformly Insulated Steel Members: Background and Verification of the Formulation Recommended by Chinese Code Cecs200

Thermal Response to Fire of Uniformly Insulated Steel Members: Background and Verification of the Formulation Recommended by Chinese Code Cecs200

Calculation of thermal conductivity of gypsum plasterboards at ambient and elevated temperature

A simplified calculation method for temperature evaluation of steel columns embedded in walls

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