See Figure. F,, = 50 ksi.
Members 1 to 4: W10 x 33, L = 12.5 ft Lb = (KL), = 12.5 ft
Members 5 to 6: W10 x 39, L = 12.5 ft Lb = (KL), = 12.5 ft
Members 7 to 8: W24 x 62, L = 30 ft L,b= (KL), = 6 ft
Members 9 to 10: W21 x 50, L = 30 ft Lb = (KL), = 6 ft
k, accounts for G = 2 at joints 1 to 3.
Nominal loads are:
Dead: w7 = w8 = 2.61 kips/ft Live (reduced): w7 = w8 = 1.54 kips/ft
Snow: w9 = wl0 = 0.9 kips/ft Wind: w9 = wl0 = -0.507 kips/ft
H4 = 3.25 kips H7 = 1.62 kips
H6 = 2.03 kips H9 = 1.02 kips
P-DELTA analyses were performed for each of the required LRFD load combi nations and the results at the ends of members 7 to 10 are:
1. For 1.20 + 1.6L + 0.5s
X, = -8.88 kips X, = -8.88 kips X, = 14.87 kips X, = 14.87 kips
Y4 = 71.1 kips Y5 = 96.7 kips Y7 = 38.1 kips Y8 = 51.0 kips
M4 = 157.5 ft-kips M5 = -541.6 ft-kips M6 = -157.5 ft-kips M8 = -282.7 ft-kips
M9 = -89.6 ft-kips M5 = 541.6 ft-kips M7 = 89.6 ft-kips M8 = 282.7 ft-kips
2. For 1.20 + 1.65 + 0.5L
X4 = -11.0 kips X,5= -11.0 kips X6 = 14.9 kips X7 = 14.9 kips
Y4 = 50.4 kips Y5 = 66.7 kips Y6 = 49.9 kips Y7 = 68.9 kips
M4 = 124.0 ft-kips M5 = 369.3 ft-kips M7 = 102.7 ft-kips M6 = 386.8 ft-kips
M8 = -369.3 ft-kips M9 = -124.0 ft-kips M, = -386.8 ft-kips M, = -102.7 ft-kips
3. For 1.20 + 1.6s + 0.8W
X4 = -6.95 kips X5 = -8.34 kips X6 = 14.5 kips X7 = 13.4 kips
Y4 = 39.5 kips 5, = 52.3 kips Y7 = 44.5 kips Y6 = 61.7 kips
M4 = 83.5 ft-kips M, = 280.5 ft-kips M5 = -309.1 ft-kips M6 = -121.2 ft-kips M7 = 86.3 ft-kips
Does the design satisfy LRFD H1.2 ?
