Abstract
RC ribbed slabs are an important structural member in building construction. Nevertheless, experimental and numerical research on them in the event of fire is lacking, and their fire behavior is still not well characterized. This paper evaluated the thermal field of RC ribbed slabs subjected to a fire situation. Two full-scale fire tests with slabs prototypes (3.6 × 4.6 m) were carried out according to the ISO 834 [1] time–temperature curve for 120 min. In the fire tests, the thermal field of the slab cross section was monitored, as well as thermal insulation, mid-span deflections, concrete cracking and longitudinal elongation. According to the experimental results, slabs with different flange thicknesses, width and height of the ribs, and position of the reinforcements were numerically evaluated through ABAQUS software. New equations were proposed to define the temperature in the steel rebars and concrete, as this is necessary information to use the Simplified Method of EN 1992-1.2 [2] for the fire design of these slabs.
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