QUESTION $1[25$ MARKS$]$

Figure $1$ illustrates a reinforced concrete column $(350220mm)$ for a multi$-$storey building at first floor level. All beams are $500300mm,$ floor slab is $175$ mm thick which is cast monolithically with beams, and floor height is $4500$ mm $.$

Structural analysis of the column for design loading produced bending moments results as shown in Figure $1.$ If the column is braced in both $x-x$ and $y-y$ axis and ultimate axial load is $785$ kN $,$ cover to reinforcement $=40mm$ and concrete grade $\frac{30}{26},$ determine suitable longitudinal reinforcement bars only, and do all necessary checks.

Assume R$8$ links and Y$20$ longitudinal reinforcement bars where necessary.

Figure $1$: Illustration of reinforced concrete column