Question $7(20$ points$)$

Beam Design $3/4$: shear stress

A wood floor beam has a uniformly distributed dead load of $80$ pounds per foot and a live load of less than $7$ days' duration of $80$ pounds per foot on a span of $22$ feet.

How much is the maximum shear stress?

$56\mathrm{.}92$

$66\mathrm{.}92$

$68\mathrm{.}92$

$44\mathrm{.}92$