Spacing of punching shear reinforcement

Where punching shear reinforcement is required the following rules should be observed.

■ It should be provided between the face of the column and kd inside the outer perimeter where shear reinforcement is no longer required. k is 1.5, unless the perimeter at which reinforcement is no longer required is less than 3d from the face of the column. In this case the reinforcement should be placed in the zone 0.3d to 1.5d from the face of the column.

■ There should be at least two perimeters of shear links.

■ The radial spacing of the links should not exceed 0.75d (see Figure 9).

■ The tangential spacing of the links should not exceed 1.5d within 2d of the column face.

■ The tangential spacing of the links should not exceed 2d for any other perimeter.

■ The distance between the face of the column and the nearest shear reinforcement should be less than 0.5d.

Figure 9

Punching shear layout

Table 10

Factor, F, for determining Asw min

Figure 9

Punching shear layout

Punching Shear Reinforcement

Table 10

Factor, F, for determining Asw min

fck

Factor, F

25

1875

28

1772

30

1712

32

1657

35

1585

40

1482

45

1398

50

1326

Note fck has been taken as 500 MPa

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