The vertical seismic force (
Fx , kip) at a story level is calculated according to the following equation:
where
|
Cvx
| = | vertical distribution factor |
|
V
| = | Base shear (kip) |
| wi & wx | = | effective seismic weight (kip) at story "
i
" or "
x
" |
| k | = | 1.0 for T ≤ 0.5 2.0 for T ≥ 2.5
Determined by linear interpolation between 1 and 2
|
For structures in Seismic Design Category 4, the following equation is used for vertical seismic shear force (Section 1.4 and Section 11.7)
where
| Wx | = | dead load of structure at story "
x
" |
