Nominal Column Moment Assignment

The following picture shows a part of multi storey steel building in simple construction where beam - column - base are pinned connected. Using 203 x 203 UC 46 (S275). Calculate (i) Axial load induced on column AB and include the self weight of the column. (ii) Nominal moment reacted at column AB (iii) Design column AB . Take Lcr = 0.85L and total factored axial load from Level 2 is 377kN