A small apartment real fire scenario was analyzed. A steel structure, without any fire protection showed inherent resistance. The compartmentation, while imperfect, was made evident. Thermal and structural analysis, by using software (SMARTFIRE, Supertempcalc and others) and metallographic tests were performed. It was concluded by metal analysis that steel components were heated up to temperatures below 550°C for the central column, and around 650°C for the hottest beam. Computational modeling shows "medium" temperatures about 380°C in central column and 610°C along beam. Based on these results, and applying simplified structural analysis, it can be observed acceptable safety levels. The sequence of this work is already in progress, that is, the study of the inherent fire safety of low-cost, residential buildings, without the traditional application of fire protection products.

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