Techno Press

Steel and Composite Structures   Volume 13, Number 2, August 2012, pages 171-185
Simple equations for the calculation of the temperature within the cross-section of slim floor beams under ISO Fire
R. Zaharia* and J. M. Franssen

Abstract     [Full Text]
    The calculation of fire resistance for a composite structural element comprises the calculation of the temperature within its cross-section and of the load bearing capacity, considering the evolution of the steel and concrete mechanical properties, function of the temperature. The paper proposes a method to calculate the bending capacity under ISO fire, for Slim Floor systems using asymmetric steel beams, with a wider lower flange or a narrow upper flange welded onto a half hot-rolled profile. The temperatures in the cross-section are evaluated by means of empirical formulas determined through a parametrical analysis, performed with the special purpose non-linear finite element program SAFIR. Considering these formulas, the bending capacity may be calculated, using an analytical approach to determine the plastic bending moment, for different fire resistance demands. The results obtained with this simplified method are validated through numerical analysis.
Key Words
    slim floor; fire design; ISO fire; simplified method.
R. Zaharia : The Politehnica University of Timisoara, Timisoara, Romania
J. M. Franssen : University of Liege, Liege, Belgium

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