MEd = 1.35 x (10 x 6^2 / 8) + 1.5 x (5 x 6^2 / 8) = 63.9 kNm
The required reinforcement area is calculated as: worked examples to eurocode 2 volume 2
Using EC2, the design bending moment is calculated as: MEd = 1
As.provided = 4 x π x (20/2)^2 = 1256 mm^2 worked examples to eurocode 2 volume 2
VEd = 1.35 x (2 x 4 / 2) + 1.5 x (1.5 x 4 / 2) = 18.5 kN
VEd = 1.35 x (10 x 6 / 2) + 1.5 x (5 x 6 / 2) = 54.5 kN
The column is stable.