$($a$)$ Apply the substitute frame method as illustrated in Figure Q$\mathrm{.}2$b to verify that themaximum design moment transferred from the beams is Mx $=553\mathrm{.}75$ kN$-$m$.($b$)$Verify that the design axial load which co$-$exists with the design moment in $($a$)$is N $=1892\mathrm{.}7$ kN$.($c$)$Find the steel area of reinforcement required for the design forces in $($a$)$ and $($b$)$ by using the Column Design Chart and then design the reinforcement for it$.($Design chart: $0\mathrm{.}31$; As $=4340$ mm$?)$