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Hence quasi-permanent load/factored load = 715/1570 = 0.46 and estimated service stress

y A 2830

s,prov

Either limit bar size using EC2 Table 4.11(1) or bar spacing using EC2 Table 4.12.

This has been chosen to comply with Table 4.12 as well.

Check minimum reinforcement requirement A > kkf, _ A Jo s c ct.eff ct s

For A it is considered conservative to use (hl2)b a = 100% x /„ = 460 N/mm2

s yk

For f use minimum tensile strength suggested by EC2 - 3 N/mm2 k = 0.4 for bending

For k interpolate a value for h = 50 cm from values given k = 0.5 + 0.3(80 - 50)/(80 - 30) = 0.68

Therefore

s.req

s,prov

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