Thermal behaviour of steel columns with steel sheet - mineral wool fire protection

Ulla-Maija Jumppanen, Juha Paavola

Research output: Book/ReportReport

Abstract

A product development project was carried out to find out such a mineral wool fire protection system for steel columns, which would meet the requirements corresponding to different fire resistance times. The primary demand imposed on the structure was to be industrially fabricated to ensure better quality of the product and lower costs of workmanship. Galvanised steel sheet casing systems containing different combinations of mineral wool of various densities, air gaps and aluminium foils between multiple layers of mineral wool were selected and investigated experimentally to find out the influence of different structural factors on the fire resistance (steel temperatures) of the columns. Besides, the columns were tested using two different test arrangements (assemblage of the column in the furnace) in order to be able to evaluate the comparability of test results obtained when using different test procedures. The efficiency of different protection systems is compared by the aid of steel temperatures of the columns or virtual heat resistances calculated for separate insulation layers or the total protection. The effective thermal conductivity of the insulation material is calculated from the test results at various times during the test and it is presented as a function of the average temperature of the insulation. The calculated values were verified by comparing the temperatures measured with those calculated by the nonlinear finite element method (ADINAT) using the determined values of thermal conductivity. It could be seen that by using these temperature dependent values of thermal material properties the calculated and measured temperatures agreed very well. An analytical calculation method to determine the temperature development in the structure was developed. Using proper constant average values for thermal material properties and linearising the heat exchange between the environment and the structure the steel temperatures can be predicted considerably well whereas the temperature distribution inside the insulation can not be determined very accurately.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages52
ISBN (Print)951-38-2981-2
Publication statusPublished - 1987
MoE publication typeD4 Published development or research report or study

Publication series

SeriesVTT Julkaisuja - Publikationer
Number504
ISSN0358-5077

Fingerprint

Mineral wool
Fire protection
Steel sheet
Steel
Insulation
Temperature
Fire resistance
Thermal conductivity
Materials properties
Aluminum foil
Hot Temperature
Heat resistance
Product development
Furnaces
Temperature distribution
Finite element method

Keywords

  • steel construction
  • steel structures
  • columns
  • fire protection
  • fire resistance
  • thermal insulation
  • mineral wool
  • thermal analysis

Cite this

Jumppanen, U-M., & Paavola, J. (1987). Thermal behaviour of steel columns with steel sheet - mineral wool fire protection. Espoo: VTT Technical Research Centre of Finland. VTT Julkaisuja - Publikationer, No. 504
Jumppanen, Ulla-Maija ; Paavola, Juha. / Thermal behaviour of steel columns with steel sheet - mineral wool fire protection. Espoo : VTT Technical Research Centre of Finland, 1987. 52 p. (VTT Julkaisuja - Publikationer; No. 504).
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Jumppanen, U-M & Paavola, J 1987, Thermal behaviour of steel columns with steel sheet - mineral wool fire protection. VTT Julkaisuja - Publikationer, no. 504, VTT Technical Research Centre of Finland, Espoo.

Thermal behaviour of steel columns with steel sheet - mineral wool fire protection. / Jumppanen, Ulla-Maija; Paavola, Juha.

Espoo : VTT Technical Research Centre of Finland, 1987. 52 p. (VTT Julkaisuja - Publikationer; No. 504).

Research output: Book/ReportReport

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AU - Paavola, Juha

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N2 - A product development project was carried out to find out such a mineral wool fire protection system for steel columns, which would meet the requirements corresponding to different fire resistance times. The primary demand imposed on the structure was to be industrially fabricated to ensure better quality of the product and lower costs of workmanship. Galvanised steel sheet casing systems containing different combinations of mineral wool of various densities, air gaps and aluminium foils between multiple layers of mineral wool were selected and investigated experimentally to find out the influence of different structural factors on the fire resistance (steel temperatures) of the columns. Besides, the columns were tested using two different test arrangements (assemblage of the column in the furnace) in order to be able to evaluate the comparability of test results obtained when using different test procedures. The efficiency of different protection systems is compared by the aid of steel temperatures of the columns or virtual heat resistances calculated for separate insulation layers or the total protection. The effective thermal conductivity of the insulation material is calculated from the test results at various times during the test and it is presented as a function of the average temperature of the insulation. The calculated values were verified by comparing the temperatures measured with those calculated by the nonlinear finite element method (ADINAT) using the determined values of thermal conductivity. It could be seen that by using these temperature dependent values of thermal material properties the calculated and measured temperatures agreed very well. An analytical calculation method to determine the temperature development in the structure was developed. Using proper constant average values for thermal material properties and linearising the heat exchange between the environment and the structure the steel temperatures can be predicted considerably well whereas the temperature distribution inside the insulation can not be determined very accurately.

AB - A product development project was carried out to find out such a mineral wool fire protection system for steel columns, which would meet the requirements corresponding to different fire resistance times. The primary demand imposed on the structure was to be industrially fabricated to ensure better quality of the product and lower costs of workmanship. Galvanised steel sheet casing systems containing different combinations of mineral wool of various densities, air gaps and aluminium foils between multiple layers of mineral wool were selected and investigated experimentally to find out the influence of different structural factors on the fire resistance (steel temperatures) of the columns. Besides, the columns were tested using two different test arrangements (assemblage of the column in the furnace) in order to be able to evaluate the comparability of test results obtained when using different test procedures. The efficiency of different protection systems is compared by the aid of steel temperatures of the columns or virtual heat resistances calculated for separate insulation layers or the total protection. The effective thermal conductivity of the insulation material is calculated from the test results at various times during the test and it is presented as a function of the average temperature of the insulation. The calculated values were verified by comparing the temperatures measured with those calculated by the nonlinear finite element method (ADINAT) using the determined values of thermal conductivity. It could be seen that by using these temperature dependent values of thermal material properties the calculated and measured temperatures agreed very well. An analytical calculation method to determine the temperature development in the structure was developed. Using proper constant average values for thermal material properties and linearising the heat exchange between the environment and the structure the steel temperatures can be predicted considerably well whereas the temperature distribution inside the insulation can not be determined very accurately.

KW - steel construction

KW - steel structures

KW - columns

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KW - fire resistance

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KW - mineral wool

KW - thermal analysis

M3 - Report

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BT - Thermal behaviour of steel columns with steel sheet - mineral wool fire protection

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Jumppanen U-M, Paavola J. Thermal behaviour of steel columns with steel sheet - mineral wool fire protection. Espoo: VTT Technical Research Centre of Finland, 1987. 52 p. (VTT Julkaisuja - Publikationer; No. 504).