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Governing ASD Load Combination

Mediumload combinationsASD
A member has nominal downward load effects D = 20 kN, L = 15 kN and S = 25 kN; all other effects are zero. Compare only these ASD candidates: D; D + L; D + S; D + 0.75L + 0.75S. Which combination is largest, and what is its value?
  1. AD + 0.75L + 0.75S = 50 kN
  2. BD + L + S = 60 kN
  3. CD + S = 45 kN
  4. D1.2D + 1.6S = 64 kN
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Answer: A. D + 0.75L + 0.75S = 50 kN

Evaluate each: D = 20 kN; D + L = 35 kN; D + S = 20 + 25 = 45 kN; D + 0.75L + 0.75S = 20 + 11.25 + 18.75 = 50 kN. The fourth is largest. Wrong: D + L + S = 60 kN adds every load without the supplied factors and is not a listed candidate; D + S = 45 kN is a candidate but not the largest; 1.2D + 1.6S = 64 kN imports LRFD factors, which do not belong in an ASD comparison.
kN
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