Q$.6.$ A long RC column of rectangular section $400mm500mm,$ reinforced with $2510$ nos. bars provided uniformly distributed along all the edges with effective cover of $50$ mm $,$ is $7\mathrm{.}5$ m long and fixed at both the ends. Check, whether the column can carry safely a load of $Pu=1200kN$ along with $x=100kN.m$ and $y=50$ kNm or not. If the section is insufficient, suggest the safe size$/$ reinforcement. Use additional moment method suggested by IS code.