Question $1$

$1pts$

A ${36}^{\text{'}}{24}^{\text{'}}$ building has two floors $($the lower floor is a slab on grade$)$ and a roof with perimeter bearing walls on four sides. There are no interior columns. There is a $12$ foot $12$ foot opening in the upper floor. The upper floor has two beams and joists ${24}^{**}$ on center. The roof is supported by two of the perimeter walls with rafters spanning $24$ feet. The framing plan is shown below.

The required loading on the upper floor is $40$ PSF live and $20$ PSF dead load. What is the loading on the joists?

$120$ PLF

$80$ PLF

$60$ PLF

$40$ PLF