$(4)$ It has been identified that the critical column of $3$ m height carries an axial compression design load of $150pkN.$ Design a suitable concrete column according to Eurocode $2$ to safely carry the applied axial compression load. Assume there is no eccentricity. Take Concrete Grade: C$30/37$; Aggregate: Maximum size $20$mm; High yield steel grade H$460$ for reinforcement, $fyk=460$N$/$mm$^2.$

$[20$ marks$]$

need to do it urgently