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Permanent:

Point load from storage area above = 88.7 kN Variable

Point load from storage area above = 138.7 kN

4.3.2 Cover

Nominal cover, cnom, underside and side of beam c„, cm where cmin = max[cmin b, cm where cmin.b = minimum cover due to bond

= diameter of bar. Assume 32 mm main bars and 10 mm links cmindur = minimum cover due to environmental conditions.

Assuming primarily XC3 / XC4 exposure (moderate humidity or cyclic wet and dry); secondarily XF1 exposure (moderate water saturation without de-icing salt, vertical surfaces exposed to rain and freezing) and C30 / 37 concrete, cmin.dur = 25 mm

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

Fire:

.'. cnom = 32 + 10 = 42 mm to main bars or = 25 + 10 = 35 mm to links

(giving cnom = 45 mm to main bars)

Check adequacy of section for 2 hours fire resistance R120 By inspection, BS EN 1992-1-2 Table 5.6 web thickness OK Axis distance, a, required = 35 mm OK by inspection .'. Try 35 mm nominal cover bottom and sides to 10 mm link

Nominal cover, cnom, top By inspection

Cnom = Cmin + Acdev where

where

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

= minimum cover due to bond = diameter of bar. Assume 32 mm main bars and 10 mm links cmindur = minimum cover due to environmental conditions. Assuming primarily XC1 and C30/37 concrete, cmindur = 15 mm

Acdev = allowance in design for deviation. Assuming no measurement of cover Acdev = 10 mm cnom = 32 + 10 = 42 mm to main bars or = 15 + 10 = 25 mm to links

Use cnom = 35 mm to links (giving cnom = 45 mm to main bars)

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