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Geometric Effects on the Fire Resistance of Structural Steel Elements
Standard methods have been developed and are used in current design practice to determine by calculation the fire resistance rating of structural steel elements protected with spray-applied fire resistive materials (SFRMs). These calculation methods are based on simplified analysis of heat transfer through the SFRM material to the steel substrate. This analysis assumes one-dimensional heat transfer in Cartesian coordinates. Based on this analysis, the ratio of the volume per unit length to the surface area per unit length, expressed in terms of the "W/D ratio," is the governing parameter for heating of the steel element. For cylindrical rods and other small structural shapes, this analysis is inappropriate because the surface area of the insulated element increases with increasing insulation thickness. Simplified and detailed numerical heat transfer analyses have been performed in both Cartesian and cylindrical coordinates that demonstrate the reduced level of fire resistance associated with a given thickness of insulation on a cylindrical rod relative to a wide-flange element with the same W/D ratio.
Geometric Effects on the Fire Resistance of Structural Steel Elements
Standard methods have been developed and are used in current design practice to determine by calculation the fire resistance rating of structural steel elements protected with spray-applied fire resistive materials (SFRMs). These calculation methods are based on simplified analysis of heat transfer through the SFRM material to the steel substrate. This analysis assumes one-dimensional heat transfer in Cartesian coordinates. Based on this analysis, the ratio of the volume per unit length to the surface area per unit length, expressed in terms of the "W/D ratio," is the governing parameter for heating of the steel element. For cylindrical rods and other small structural shapes, this analysis is inappropriate because the surface area of the insulated element increases with increasing insulation thickness. Simplified and detailed numerical heat transfer analyses have been performed in both Cartesian and cylindrical coordinates that demonstrate the reduced level of fire resistance associated with a given thickness of insulation on a cylindrical rod relative to a wide-flange element with the same W/D ratio.
Geometric Effects on the Fire Resistance of Structural Steel Elements
Mowrer, Frederick W. (author)
Structures Congress 2005 ; 2005 ; New York, New York, United States
Structures Congress 2005 ; 1-12
2005-04-18
Conference paper
Electronic Resource
English
Geometric Effects on the Fire Resistance of Structural Steel Elements
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