$($b$)$ Design the main reinforcement for the siem at section Oft. above this base.

$\backslash$table$[[$A$,13$in $0$ in$],[$B$,46$ in$],[$c$,$Ift Gin$],[$D$,6$ft oin$],[$E$,$If $6$ in$],[$h$,2419$in$],[,30$