Problem $5$: Examplel: Design a rectangular beam and then draw the crosssection for beam, that must carry live load of $40k\frac{N}{m}$ and a dead load of $20k\frac{N}{m}($including self$-$weight$)$ on a simple span of $6m,$ the beam dimensions are limited for architectural reasons to $250mm$ width and $500mm$ depth, design this beam for flexural In your design assume that:

$f{c}^{}=24$MPa

fy $=420$MPa

$\frac{O}{25}$ for longitudinal tension reinforcement.

$\frac{O}{20}$ for compression reinforcement if required.

$\frac{O}{10}$ for stirrups.

Two layers of tension reinforcement.

diameter of stirrups $=10mm$ and the cover of concrete $=4cm.$