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2.3 Fire Resistance Design
The fire resistance design in RF-CONCRETE Members is performed by using the simplified calculation method according to EN 1992-1-2, clause 4.2. The program uses the zone method described in annex B.2:
In case of exposure to fire, the bearing capacity is reduced due to a reduction of the component's cross-section and a decrease of material strengths. The concrete zones that are directly exposed to fire and thus damaged are not taken into account for the equivalent cross-section used for the fire resistance design. The fire protection design is performed with the reduced cross-section and the reduced material properties analogous to the ultimate limit state design at normal temperature.