For the column section given:

Materials: C$30,$ S$420$ For longitudinal and shear reinforcement

Dimensions: $b=400mm,h=800mm$

Longitudinal Reinforcement: $824$

Tie bar: $\frac{10}{100}mm$

Cross tie bars: $\frac{10}{100}mm$

Accept $d^{\text{'}}=18mm$

Using the given column design charts, calculate the following:

a$)$ Find design flexural moment capacity about $x$ axis $(M_{Rx})$ where $N_d=0$

b$)$ For $N_d=3840kN,$ find $M_{ry}$

c$)$ For $N_d=1920kN$ and $M_{ry}=1024kN.m,$ calculate the required area of longitudinal reinforcement $(A_s)$

and steel configuration $8?$

d$)$ Calculate the design shear in $x$ and $Y$ directions $(Vrx$ and $Vry,$ consider $Nd=0$ that the factor, $=1$