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Thus this area of the bottom reinforcement is the minimum that should be made continuous throughout the slab.

2.3.10 Reinforcement details

The reinforcement details are shown in Figure 2.2.

Figure 2.2 Slab reinforcement details

2.4 Main beam

2.4.1 Cover for durability and fire resistance

Nominal cover for exposure class 1 (internal) is 20 mm. NAD

Table 6

Nominal cover for 1 hour fire resistance is 20 mm. BS 8110

Table 3.5

Use 20 mm nominal cover to links

2.4.2 Loading

Permanent load from slab (Section 2.3.3) = 4.7 x 5 = 23.5 kN/m Self-weight of beam = (0.5 - 0.175) x 0.3 x 24 = 2.3 kN/m Characteristic permanent load (gk) = 25.8 kN/m Characteristic imposed load (qk) = 5x4 = 20 kN/m

Maximum design load = 1.35grk + 1.5g = 64.8 kN/m Minimum design load = 1.35gr = 34.8 kN/m

2.4.3 Analysis

2.4.3.1 Idealization of structure and load cases

The structure is simplified as a continuous beam attached to columns above and below, which are assumed to be fixed at their upper ends and pinned at the foundations, as shown in Figure 2.3.

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