A

is

the gross cross-section area of bolt;

Ao

is

the area of the rivet hole;

Avc

is

the shear area of the column, see EN 1993-1-1;

As

is

the tensile stress area of the bolt or of the anchor bolt;

Av,eff

is

the effective shear area;

Bp,Rd

is

the design punching shear resistance of the bolt head and the nut

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