Punching shear resistance of a column base without shear reinforcement, v_Rd

The punching resistance of column bases should be verified at control perimeters within 2d from the periphery of the column. The design punching shear resistance [MPa] of a column base without shear reinforcement may be calculated as follows:

where:

f_ck

is the characteristic compressive strength of concrete, see Table 3.1

k

= 1 + √200/d   ≤ 2,0
where d is the effective depth, in [mm]

a

is the distance from the periphery of the column to the control perimeter considered, in [mm]

ρ_l

= (ρ_ly⋅ρ_lz)^1/2   ≤ 2%
ρ_ly, ρ_lz are longitudinal reinforcement ratios in y- and z- directions respectively

C_Rd,c

is a Nationally Determined Parameter, see § 6.4.4 (1)

v_min

is a Nationally Determined Parameter, see § 6.4.4 (1), or (6.3N) for the calculation of v_min following the Eurocode recommendation.