Roof Joists

In this project we had to find the types of roofs and joists to use on the library project.

This project was long and boring because you had to do everything twice and it got LONG!!!!

Pq = 20
Ps = 20
Is = 1.0
Ct = 1.0
Cs = 1.0
Ce = 1.0
TOTAL Dead Load (DL) = 34.25 psf
D + L + (Lr or S or R) = 54.25 double span 7’ deck type 18

Interior Beam Tributary width = 5
The uniform beam loading equals tributary width multiplied by the floor loading =
5*54.25 = 271.25

Exterior Beam Tributary width = 2.5
The uniform beam loading equals tributary width multiplied by the floor loading =
2.5*54.25 = 135.62

interior joist 30’ 16k7
exteroir joist 30’ 16k2