ASCE 7 ASD Load Combinations: Governing Demand and Net Uplift
Combines dead, live, roof (snow/rain), and signed wind into the seven ASCE 7 §2.4.1 basic ASD combinations and returns the two cases the trades design to: the largest gravity demand (which sizes the beam, joist, or footing) and the most negative case (which, when 0.6D + 0.6W goes below zero, is the net uplift the roof-to-wall hold-down must resist). A member is never designed for one load at a time - the governing combination is, which is why the design starts here, not at the largest single load. A load-combination aid, not a member design.
Formula and source
combos = [D; D+L; D+S; D+0.75L+0.75S; D+0.6W; D+0.75L+0.75(0.6W)+0.75S; 0.6D+0.6W]; governing_gravity = max(combos); controlling_case = min(combos); net_uplift = controlling_case < 0 ? -controlling_case : 0.
ASCE 7 §2.4.1 basic ASD load combinations, by name; the combination coefficients are the standard's values.
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