Situation:

Slab Thickness, $t=100mm$

Effective depth, $d=550mm$

Web width, bw $=300mm$

Beam spacing $=2\mathrm{.}0$ on centers

Simple span$=4\mathrm{.}8m$

Materials:

$f^{\text{'}}c=28$MPa

$fy=400$MPa

The slab is casted monolithically with the beam and steel bars to be placed in one layer only. Determine the following:

$48.$ The effective width of the slab $($mm$)$ acting as concrete flange in in the design of the beam for positive bending.

A$.1000$

C$.1100$

B$.1500$

D$.900$

$49.$ The number of pcs of $32$ mm bars required for the beam to resist a design moment of $600kN-m$