See Figure. Fy = 50 ksi.
Members 1 and 2: W10 x 33, L = 15 ft; Lb = (KL), = 15 ft
Member 3: W10 x 39, L = 15 ft; Lb = (KL), = 15 ft
Members 4 and 5: W24 x 62, L = 36 ft; Lb = (a), = 6 ft.
k, accounts for G = 10 at joints 1 to 3.
Nominal loads are:
Dead: w = 1.5 kips/ft
Live: w = 1 kips/ft
Snow: w = 0.9 kips/ft
Wind: w = -0.507 kips/ft H, = 2.4 kips
P-DELTA analyses were performed for each of the required LRFD load combi- nations (p. 6-30) and the results at the ends of members 4 and 5 are:
1. For 1.20 + 1.6L + 0.5S, H, = 1.5 kips X, = 5.22 kips X, = 5.22 kips Y, = 55.2 kips Y6 = 55.2 kips M, = 72.4 ft-kips M, = 580.7 ft-kips M, = -580.7 ft-kips M, = -72.4 ft-kips
2. For 1.20 + 1.6s + 0.5L, X, = 5.07 kips M, = -564.1 ft-kips X, = 5.07 kips Y6= 81.0 kips M, = 564.1 ft-kips M, = -70.3 ft-kips Y, = 53.6 kips M, = 70.3 ft-kips
Does the design satisfy LRFD H1.2?