at its two thesign: A $12-$inch$-$wide bean be kips. third points. The two loads are folow supports two equal concentrated loads kips. Neglect the self$-$weight of the factored $($combined$)$ and have magnitude of $90$ concrete$)$ and $f_{yt}=60,000$ ps of the beam and use $f_c^{\text{'}}=5000($normal weight reinforcement is $21\mathrm{.}5$ in$..$

$($a$)$ Draw the shear diagram of the beam under the two concentrated loads. $(10$ points$)$

$($b$)$ On the shear diagram in $($a$),$ mark up the regions of the beam where shear reinforcement is NOT required per ACI$318-19.$ Show calculations if necessary. $(10$ points$)$

$($c$)$ If No$.4$ double$-$leg stirrups are used as shear reinforcement, determine the spacing of the stirrups in the regions where shear reinforcement is required. Check your design with the requirements on minimum shear reinforcement and maximum spacing of stirrups per ACI$31819.(15$ points$)$