Vertical Seismic Load Effect per ASCE 7-16 §12.4.2.2

Symbols

S_DS = Short period design spectral acceleration coefficient
S_av = Design vertical response spectral acceleration
D = Dead load
E_v = Vertical seismic load
E_h = Horizontal seismic load effect

Vertical Seismic Load Effect

The vertical seismic load effect, E_v, is determined in according to Eq. (12.4-4a) for buildings that are seismic design categories A and B.

The vertical seismic load effect, E_v, is determined in according to Eq. (12.4-4b) for buildings that are seismic design categories C, D, E and F.

The vertical seismic load effect can be taken as zero for either of the following conditions:

• Structures assigned to Seismic Design Category B.

• In Eq. (12.4-2), where determining demands on the soil–structure interface of foundations.