Question $3$

$[35]$

A long reinforced concrete column $(300mm300mm5800mm)$ needs to be designed for a new structure being built in Centurion. The column forms part of a new multi$-$storey building where there is a lift shaft in the building. You have been tasked to design the suitable reinforcement for the column to resist an ultimate axial load $=840kN$ and bending moments as shown, using the relevant SANS codes, and to detail accordingly.

The column, as shown in Diagram Q$.3($not to scale$),$ is braced about both axis and should be designed for moderate exposure conditions and a $1-$hour fire resistance. Assume longitudinal reinforcement of Y$40$ bars and R$8$ links.

Characteristic concrete strength, fcu: $=30$MPa,

Maximum aggregate size, hagg: $,=19\mathrm{.}5mm$

Diagram Q$.3$