Steel fibre reinforcement is being increasingly considered as a profitable alternative to the traditional welded steel mesh for secondary load bearing mechanisms, such as transversal bending of precast roof elements. The experimental investigation here presented is aimed to check the fire resistance of steel fibre reinforced concrete (SFRC) thin slabs. The application of fire recommendation (Eurocode 2 part 1.2 and UNI 9502) to SFRC requires the knowledge of the tensile strength decrease due to high temperature exposure. Scanty data are available in the literature, but useful information could be obtained in "residual" conditions, i.e. by testing the specimen at room temperature after a suitable thermal cycle. In this paper the influence of the testing conditions (hot vs. residual) on the tensile mechanical behaviour of the material is investigated. The accordance between these test modalities and the design proposal herein presented allow a reliable assessment of both the hot and the residual capacity of thin webbed SFRC members submitted to fire.
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