Detailing of principal bending moment reinforcement

CIRIA Guide 2 states 'Reinforcement is not to be curtailed in the span and may CIRIA

be distributed over a depth of 0.2h . A minimum steel percentage in relation Guide 2

to the local area of concrete in which it is embedded is given in Cl.2.4.1

Minimum steel percentage = 0.71%

A maximum bar spacing for a maximum crack width of 0.3 mm is given in Table 2 of the CIRIA Guide.

Reinforcement may be distributed over depth = 0.2 x 5750 = 1150 mm i.e. minimum number of bars in face = = 7

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