Deep elements

For deep elements the advice in Eurocode 2 for the side faces of deep beams may be followed. The UK National Annex recommends that 0.2% is provided in each face. The distance between bars should not exceed the lesser of twice the beam depth or 300 mm. For pile caps the side face may be unreinforced if there is no risk of tension developing.

Table 8

Minimum percentage of reinforcement required

fck

fctm

Minimum % (0.26 fam /fyka )

25

2.6

0.13%

28

2.8

0.14%

30

2.9

0.15%

32

3.0

0.16%

35

3.2

0.17%

40

3.5

0.18%

45

3.8

0.20%

50

4.1

0.21 %

Key a Where /yk = 500 MPa.

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