Abstract
The slim floor beams, characterized by the steel profile embedded in the concrete slab, may be found in different configurations, based on the shape of the steel profile cross-section, which can vary from a rectangular to double-T section. While the most common shape used nowadays is the double-T cross-section, the Eurocodes do not provide a simplified method for the fire resistance assessment. The literature offers a simplified method for computation of bending resistance under elevated temperature, based on existing research on thermal models, and was validated for a particular type of slim floor beams (SFB). The current study extends the scope of application of this method, for different types of slim floor beam, which include an asymmetric double-T steel cross-section. The objective was reached through a numerical procedure, by analyzing 162 configurations subjected to four different fire requirements (R30, R60, R90, R120), resulting in a total of 648 analyses, performed with a validated numerical model in SAFIR software. The results in terms of bending resistance showed that the simplified method represents a strong tool for the fire design of slim floor beams.
Highlights
In slim floor systems, the beams are integrated in the thickness of the slab, reducing the height of the floor
Zanon et al [21] validated the method with a comprehensive analysis of tests and a broad numerical parametric study, but only for one type of slim floor beams(SFB type, which consists in a double-T profile with a supplementary wider plate welded below the bottom flange)
The current study aims to extend the scope of application of Zanon et al.’s [21] method for different configurations of slim floor beams, made of asymmetric double-T steel cross-sections, in which no supplementary plate is welded on the bottom of the profile
Summary
In slim floor (or shallow floor) systems, the beams are integrated in the thickness of the slab, reducing the height of the floor. Zaharia and Franssen [15] proposed a simplified method for calculating the temperature in the steel profile (on lower flange and along the web height) and in the rebars above the bottom flange This method was developed based on numerical simulations of an IFB system, subjected to an ISO fire. Zanon et al [21] validated the method with a comprehensive analysis of tests and a broad numerical parametric study, but only for one type of slim floor beams(SFB type, which consists in a double-T profile with a supplementary wider plate welded below the bottom flange). The current study aims to extend the scope of application of Zanon et al.’s [21] method for different configurations of slim floor beams, made of asymmetric double-T steel cross-sections, in which no supplementary plate is welded on the bottom of the profile.
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