a beam with an effective span of 8.2m is required to carry uniformly disributed loading of gk = 12 kNm-1(in additon to its own self weight) and qk = 10kNm-1.

design a suiable reinforced concrete beam using strength class C30 concrete and high yield reinforcement

i have worked a lot on this but still seem to struggle

worked out concrete section size, lever arm, area of steel, checking % of steel. but still lost on the need help