Example

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 $q=?$

$\backslash$table$[[$Materials: C$25/$S$420],[$Longitudinal reinforcements$],[A_s=462m{m}^2$