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ASCE 7 Factored Load Combination

Mediumload combinationsLRFDASCE 7snow load
A column supports nominal loads of dead kN, floor live kN and roof snow kN. There is no wind or seismic load. Using the ASCE 7 strength design (LRFD) combinations, the governing factored axial load is most nearly:
  1. A70 kN
  2. B120 kN
  3. C128 kN
  4. D154 kN
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Answer: D. 154 kN

Check every LRFD combination that can apply. 1.4D = 70 kN. 1.2D + 1.6L + 0.5S = 60 + 48 + 20 = 128 kN. 1.2D + 1.6S + (L or 0.5W): with no wind the bracketed term is L, so 60 + 64 + 30 = 154 kN. The wind and seismic combinations add nothing here. The largest value, 154 kN, governs, and it comes from the combination that treats snow as the principal variable load. Summing D + L + S = 120 kN is the unfactored ASD-style total and underestimates the required strength.
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