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Notation
D = dead load
E = earthquake load
Eh = effect of horizontal seismic forces
Em = seismic load effect, including overstrength
Emh = effect of horizontal seismic forces, including overstrength
Ev = vertical seismic effect applied in the vertically downward direction
L = live load
Lr = roof live load
R = rain load
S = snow load
U = strength of a member or cross section required to resist factored loads or related internal moments and forces in such combinations as stipulated in ACI 318-19
W = wind load
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The required strength of a member U is at least equal to the effects of factored loads in ACI Table 5.3.1. Internal forces and moments resulting from the load combination are expressed as the required strength for the design.
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