Problem: We have three designs:

$($a$)$

$($v$)$

$($c$)$

The square box beam is constructed

from four planks as shown. Knowing

that the spacing between nails is $s=1\mathrm{.}75$

in$.$ and the beam is subjected to a

vertical shear of magnitude $V=600lb,$

determine the shearing force in each nail

for all three designs.

$A_w={4\mathrm{.}5}^2-3^2=11\mathrm{.}25ii{n}^2$