Figure

Procedure for determining punching shear capacity for pad foundations

START

Determine value of factor ¡3 ¡3 =1.0 when applied moment is zero; refer to Expressions (6.38) to (6.42) from BS EN 1992-1-1 for other cases)

Determine value of vEd,max (design shear stress at face of column) from: VEd,max = ß(VEd - PVM) (from Exp. (6.38)) (uod.ft)

where u0 is perimeter of column (see Clause 6.4.5 for columns at base edges) deff = (dy + dz)/2 where dy and dz are the effective depths in orthogonal directions

Determine value of VRd,max (refer to Table 7)

Determine value of vEd, (design shear stress) from:

Determine value of vEd, (design shear stress) from:

where u1 is length of control perimeter (refer to Figure 5). For eccentrically loaded bases, refer to Exp. (6.51). The control perimeter will have to be found through iteration; it will usually be between d and 2d

Determine concrete punching shear capacity vr (without shear reinforcement) from 2dvRd,c/a (Refer to Table 6 for VRd,c)

Determine concrete punching shear capacity vr (without shear reinforcement) from 2dvRd,c/a (Refer to Table 6 for VRd,c)

Either increase main steel, or provide punching shear reinforcement required.

(Not recommended for foundations.)

No shear reinforcement required. Check complete.

Either increase main steel, or provide punching shear reinforcement required.

(Not recommended for foundations.)

No shear reinforcement required. Check complete.

Figure 5

Typical basic control perimeters around loaded areas

Figure 5

Typical basic control perimeters around loaded areas

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