Section A

Select the most suitable answer.

Answer all questions. You are allowed to use a Hard Copy of BS $8110$: Part I and BS$8110$:

Part III. State the assumptions where it is necessary.

A two$-$story house consisting of braced frames has columns on a grid $4\mathrm{.}5m5\mathrm{.}5m,$

supporting beams of dimension $600mm300mm$ in one direction only, and a one$-$way

slab of $150mm$ thickness. The roof also has a beam$-$slab arrangement identical to other

floors. The columns are of dimension $300mm300mm$ and the soffit to soffit height of

floors is $2\mathrm{.}8m$; the height from the top of the pad foundation $($designed to resist moment$)$

to the soffit of the first$-$floor beams is $3\mathrm{.}5m.$

Unit weight of concrete is $24kN{m}^{-3},C35$ concrete, High yield steel, mild exposure, $2\mathrm{.}5$

hrs$.$ fire resistance.

Loadings: Imposed loads on the roof and the floors are $1\mathrm{.}75kN{m}^{-2}$ and $2\mathrm{.}5kN{m}^{-2}$

respectively, allowance for partitions and finishes are $1\mathrm{.}5kN{m}^{-2}$ each.

a$.$ Design the internal column in the ground floor segment against SLS durability and

SLS fire resistance.

b$.$ Calculate the ultimate axial load.

c$.$ Check whether the column is short or slender.

d$.$ Calculate the area of longitudinal reinforcement.

e$.$ Find the number of bars for longitudinal reinforcement and do the necessary checks.