As = 0.01 x 0.4 x 0.4 x 500 = 800 mm^2
The slab requires additional shear reinforcement. worked examples to eurocode 2 volume 2
As.provided = 4 x π x (16/2)^2 = 804 mm^2 As = 0
The beam requires additional shear reinforcement. worked examples to eurocode 2 volume 2