Problem: Determine the LRFD nominal and adjusted design values and adjusted design resistances for the following members and loading combinations. All members are Select Structural Southern Pine and are fully braced to prevent lateral torsional bucking.
Given:
a. Roof Joists are 2x6 at 24 inches on center which directly supports the roof sheathing. Loads are 1.2D+1.6S
b. A 4x12 that supports 1.2D+1.6L+0.5Lr with L from occupancy.
c. Purlins in a roof are 2x10 inches at 4ft on center. Loads are 1.2D+1.6Lr
d. Floor beams are 4x10 at 4ft on center. Loads are 1.2D+1.6W+L