Problem 2.24
Load Symbol Given Value (psf)
(acting downward)dead load D 10 weight of ice Di 0 earthquake load E 2 load due to fluids F 0 flood loads Fa 0 load due to sub-surface pressure H 0 live load L 0 roof live load Lr 20 rain load R 30 snow load S 35 self-straining force T 0 wind load W 18 wind-on-ice Wi 0
ASCE 7 IBC ASD Load Combination Possible Values (psf) Largest Value (psf) 1 16-8 D + F 10 10 2 16-9 D + H + F + L + T 10 10 3 16-10 D + H + F + (Lr or S or R) 30 or 45 or 40 45 4 16-11 D + H + F + 0.75(L + T) + 0.75(Lr or S or R) 25 or 36.25 or 32.5 36.25 5 16-12 D + H + F + (W or 0.7E) 28 or 11.4 28 6 16-13 D + H + F + 0.75(W or 0.7E) + 0.75L + 0.75(Lr or S or R) 38.5 or 49.75 or 46
or 26.05 or 37.3 or 33.5549.75 7 16-14 0.6D + W + H --A --A 8 16-15 0.6D + 0.7E + H --A --A A Combinations 7 and 8 are not applicable because W and E are acting in the same direction (downward) as D. See highlighted paragraph in ASCE 7 section C2.4.