Design the sections below for the provided required

strength $($Mu$).$ Note that section has a block$-$out $($a void$)$ for

electrical conduit. Compute As$,$ max and determine $Mn$

provided by this $As,$ max. If $Mn$ is less than $,$ design the

sections as doubly reinforced. Select the bars, calculate the

actual effective depths, and $Mn.$ Check the strains in

tension and compression reinforcement. Use normal

weight concrete with $f{c}^{\text{'}}=24$MPa,$fy=414$MPa,$10$

bars for shear reinforcement, $50mm$ clear cover, $=$

$675$ kN$.$m$.$

first assume of $d=h-100,d^{\text{'}}=72\mathrm{.}5mm$