As a structural engineer in an engineering design firm, you are responsible for generating the structural

drawings for a Three$-$story concrete office building, including the ground floor, with total dimensions

of $18m+Fm$ in width by $12+Fm$ in depth. The building has a total height of $+12m.$

Note that: $F=$ your group number $**0\mathrm{.}1$

The information provided by the designer of structural engineering is as follows:

There are five vertical axes in the long direction and four horizontal axes in the short one.

Distances between axes due to the design requirements should be:

Not equal,

Not more than $6m.$

$2\mathrm{.}5m$ between only two of the middle vertical axes

The height of any floor should not be less than $3\mathrm{.}5m$ and more than $5m,$ However, the ground floor

should have a greater height than the other floors.

There are concrete columns that are centered at the intersections of all axes.

The external columns $"$C$1"$ have square cross$-$sections of $250mm,$ instead, the internal

columns $"$C$2"$ have circular cross$-$sections with a typical diameter that ranges between

$350mm$ to $500mm,$ and should satisfy the following equation:

Column diameter $($d$),mm($Max span between axes $(mm))/12$

The foundation system is isolated footings for all columns, except for the columns with $2\mathrm{.}5-$meter

spacing, which shall be combined footings due to the limited spacing between the columns.

The isolated footings of the external columns $"$C$1"$ and the internal columns $"$C$2"$ are $600mmx$

$600mm,$ and $900mm900mm,$ respectively. However, you should use combined footings if the

distance between the columns is less than $2\mathrm{.}5m.$ All the footings have the same depth, which is

ranging between $500mm$ to $800mm.$