Question $3[30$ marks$]$

The layout of a $150mm$ thick simply supported slab over a proposed garage has overall dimensions of $65003500mm$ and supports a live load of $1\mathrm{.}5k\frac{N}{m^2}.$ The slab is supported by $230mm$ thick walls. The environmental conditions are mild, and a $1hr$ fire rating is required.

Assume deflection is acceptable $($no need to check$),$ with concrete characteristic strength $f_{cu}=30$MPa, steel yield strength $f_y=450$MPa and $\frac{O}{12}mm$ reinforcement bars for effective depth.

Use the information above to do the following:

$($a$)$ Determine the cover of the slab as per relevant Standard.

$(2$ marks$)$

$($b$)$ Determine the required area$($s$)$ of the reinforcement for the slab.

$(12$ marks$)$

$($c$)$ Check the code requirements for minimum and maximum area of reinforcement and choose suitable reinforcement$($s$)$ to be provided in the slab.

$(5$ marks$)$

$($d$)$ Check the code requirements for shear and reinforcement bar spacing. marks$)$

TOTAL: $65$ MARKS