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The emergence of tensile membrane action as a key load-carrying mechanism has increased experimental and numerical studies on the fire performance of concrete slabs since 2000, however, the different behaviour due to aggregate type is less studied in slabs numerical analysis. This paper presents a numerical analysis of the thermomechanical behaviour of reinforced concrete slabs exposed to fire, using Finite Element Modelling in ATENA and GiD. Results were validated against experimental data from the literature subjecting slabs to ISO834 and hydrocarbon time- temperature curves. 3 calibration steps were done to combine mechanical and thermal behaviours. A parametric analysis was carried out with calcareous and siliceous aggregates to provide information for safer slab design and consequent fewer accidents related to fire situation. The choice of aggregate type must always be considered in design.

This paper presents a structural fire design of a loadbearing external wall from a Brazilian 3-storey structural masonry building based on Eurocode EN 1996-1-2, through an adaptation of tabular data and simplified calculation methods for buildings designed according to Brazilian standards for the ultimate and serviceability states. The building fire safety regulation of the State of São Paulo instructs the use of Eurocodes in the absence of a specific national standard for structural fire design. EN 1996-1-2 procedures are applied to provide information to Brazilian standardization, comparing results for concrete and clay units. The observed limitations in these adaptations of design methods may not be uncommon to other EU countries. Finally, for a 60-minute TRRF (Brazilian requirement), the building required a minimum thickness (Eurocode requirement) of 100/140mm for concrete units and 90/100mm for clay units.