I perform fire resistance design in RF‑/CONCRETE Columns. Which source does the design formula according to Section 5.8.8 refer to?

Answer

The fire resistance design with RF‑/CONCRETE Columns is performed according to the simplified calculation method according to EN 1992‑1‑2 [1], Section 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.

That is: The nominal curvature method according to [1], Section 5.8.8, is performed with the hot materials and reduced cross-section.

Keywords

Fire resistance Fire resistance design Column

Reference

[1]   EN 1992-1-2: Bemessung und Konstruktion von Stahlbeton- und Spannbetontragwerken - Teil 1-2: Allgemeine Regeln - Tragwerksbemessung für den Brandfall

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