Cover

Nominal cover, cnom cnom = cmin + Acdev where cmin = max[cmin,b; cmin.dur]

where cm

= minimum cover due to bond = diameter of bar. Assume 25 mm main bars and 8 mm links cmindur = minimum cover due to environmental conditions. Assuming XC1 and C30 / 37 concrete, cmindur = 15 mm

Acdev = allowance in design for deviation. Assuming no measurement of cover Acd= 10 mm

.*. cnom = 15 + 10 = 25 mm to links or = 25 + 10 = 35 mm to main bars Use 10 mm diameter links to give cnom = 35 mm to main bars and 25 mm to links (as per ribbed slab design)

Fire:

Check adequacy of section for REI 60

Axis distance required

Minimum width bmin = 120 mm with a = 25mm or bmin = 200 mm with a = 12 mm

By inspection, not critical

<BS EN 1992-1-2 5.6.3> <BS EN 1992-1-2 Table 5.6>

Use 25 mm nominal cover to links sss The actions may also have been estimated assuming an elastic reaction factor of 1.1 for the slab viz:

Permanent: UDL kN / m

Loads from ribbed slab (7.50 + 9.0) / 2 x 4.30 x 1.1 = 39.0 Self-weight/patch load extra over solid 2.0 x 4.17 = 8.3

47.3

Variable

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