Problem $1$ A double $T$ precast beam with the shown cross section spans as a simply supported beam over a $25-ft$ span. The support widths are $18in.$ The beam has $f_c^{\text{'}}=4,000$ and Grade $60$ steel. The beam resists its own weight and a uniformly distributed service $($unfactored$)$ live load of $4\frac{k}{f}t.$ The live load is stationary, so only shear diagram is necessary for the calculations. Determine the spacing of #$3$ stirrups throughout the beam span.

Hint: You need to account for both webs and the total number of legs of the stirrups.

$1\mathrm{.}5"$ clear to #$3$ stirrups