Example

Material coefficients

${}_{mc}$ :$1\mathrm{.}5($Concrete$)$

${}_{ms}$:$1,15($Steel$)$

$Mr=?$

Materials : C$20/25-$

BS$420$C

$A_s=418$

$b_w=250mm$

$h=500mm$

$d^{\text{'}}=30mm$

$k_1=0,85,k_3=0,85$

${}_b=0\mathrm{.}0164($from

table$)$

$d=500-30=470mm$

Max $q=$