PROBLEM $11\mathrm{.}2$:

A reinforced concrete slab is built integrally with its supports and consists of two equal spans, each with a clear span of $3m.$ The service live load is $4\mathrm{.}8k\frac{N}{m^2}.$ Assume $f_c^{\text{'}}=28$MPa and $f_y=420$MPa for all bars. Unit weight of concrete is ${}_c=23\mathrm{.}5k\frac{N}{m^3}.$ The slab is not exposed to earth or weather. Design the slab following provisions of NSCP $2015.$ Use $12mm\frac{O}{?}$ for all bars.