Vol. 3, No. 1, pp. 512-529(2007)
SIMPLIFIED APPROACH TO EVALUATION OF STEEL BEAM-COLUMN
FIRE RESISTANCE
M. Maślak
Assistant Professor, Department of Civil Engineering,
Cracow University of Technology, 31-155 Cracow, Warszawska 24, Poland
(Corresponding author: E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it. )
Received: 7 September 2006; Revised: 21 October 2006; Accepted: 25 October 2006
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ABSTRACT
The approach, presented in this paper, allows a designer to assess the value of steel member fire resistance if unlimited thermal deformations are restrained. The beam analysed in the example is subject to bending in persistent design situation; whereas, under the influence of fire temperature, additional compression force occurs. The fire resistance of structural element depends on the degree of restraints. Large flexural stiffness of columns which bound the beam leads to the relatively small value of beam fire resistance. Alternatively, if their stiffness is lower (deformability is greater) the reduction of member fire resistance in relation to the beam with fully unrestrained thermal deformations is also softer. Results obtained in the presented analysis should be interpreted only as an approximation of real values. More accurate solutions can be reckoned only if rheological effects, particularly creep of steel, are taken into account.
KEYWORDS
beam-column; fire; temperature; fire resistance; thermal deformation
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