Problem $5.$

The ultimate shear and moment load applied

to the below concrete beam are $V_u=150$kip

and $M_u=730$ kip.ft respectively.

Using #$4$ stirrups with $f_y=40$ksi,$f_c^{\text{'}}=$

$4$ ksi $,$ and a specified concrete cover of

$\frac{11}{2}in,$ the spacing that should be provided

for those stirrups is most nearly: