12.4.2.2 Vertical Earthquake Impact
Vertical seismic load effect is determined automatically according to 14.4.2.2.
Symbols
SDS = Short period design spectral acceleration coefficient
Sav = Design vertical response spectral acceleration
D = Dead load
Ev = Vertical seismic load
12.4.2.2 Vertical Seismic Load Effect
The vertical seismic load effect, Ev, is determined in according to Eq. (12.4-4a) for buildings which are seismic design category A and B.
The vertical seismic load effect, Ev, is determined in according to Eq. (12.4-4b) for buildings which are seismic design category C, D, E and F.
If buildings obey the following rules, Ev, can be taken as zero.
a. In Eqs. (12.4-1), (12.4-2), (12.4-5), and (12.4-6) for structures assigned to Seismic Design Category B.
b. In Eq. (12.4-2) where determining demands on the soil– structure interface of foundations.
