Can anyone explain to me how vertical forces due to seismic loading are accounted for in the load combination in this publication? I am familiar with the IBC provisions of 0.2*Sds*D and applying this term with the dead load factor. However, since the load combinations in this ASCE publications are different, and there is no mention of how to apply vertical seismic loads, I am not sure the correct way to apply the seismic load when modeling substation structures use this publication.
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