Fire resistance

Eurocode 2, Part 1-2: Structural fire design5, gives a choice of advanced, simplified or tabular methods for determining the fire resistance. Using tables is the fastest method for determining the minimum dimensions and cover for flat slabs. There are, however, some restrictions and if these apply further guidance can be obtained from specialist literature6.

Rather than giving a minimum cover, the tabular method is based on nominal axis distance, a. This is the distance from the centre of the reinforcing bar to the surface of the member. It is a nominal

Table 1

Flat slab design procedure

Table 2

Minimum dimensions and axis distances for reinforced concrete slabs

(not minimum) dimension, so the designer should ensure that a > C„om + Flink + Fbar/2

The requirements for flat slabs are given in Table 2.

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