Figure $1$ shows a RC external column $(450mm450mm)$ of a building. The service dead

$($permanent$)$ load and service live $($imposed$)$ load carried by the column are $2500kN$ and $1200kN,$

respectively. An isolated square footing of size $3000mm3000mm$ and depth $800mm$ is proposed

to transfer the load to the soil below. The column load passes through the centroid of the footing.

The allowable bearing capacity of soil is $600$kPa. Drawing is not to scale. For durability

considerations, take the characteristic concrete compressive strength $f^{\text{'}}=25$MPa and a minimum

concrete cover of $75mm.RC$ weight is $25k\frac{N}{m^3}.$

$($c$)$ Because of the boundary restraint, if the centroid of the footing has to be eccentric with respect

to the centre of the column by $400mm,$ calculate the additional service moment $($in the

clockwise direction$)$ the footing will be subjected to$.$ In this scenario check whether the area of

the footing would be sufficient from bearing capacity consideration. Draw the subsoil pressure

distribution in this case below the footing showing the salient values.

Figure $1.$ Isolated footing for Question $1.$