As = 0.01 x 0.4 x 0.4 x 500 = 800 mm^2
VRd,c = 0.12 x (1 + (0.6/0.2)) x 0.2 x 1 x 25 = 12.5 kN worked examples to eurocode 2 volume 2
As.provided = 4 x π x (16/2)^2 = 804 mm^2 As = 0
As.provided = 4 x π x (20/2)^2 = 1256 mm^2 worked examples to eurocode 2 volume 2