Can STAAD automatically calculate the seismic forces both in horizontal and vertical direction required by ASCE as shown next
As per section 12.4.2 of ASCE 7-10,
E = Eh + Ev
E = Eh – Ev
Eh = ρ * QE (equation 12.4-3 of ASCE 7-10) is the Horizontal seismic load effect
Ev = 0.2 * SDS * D is the vertical seismic load effect described in equation 12.4-4
STAAD calculates only the QE term of the horizontal component Eh. The user has to manually multiply QE by ρ to obtain Eh. There is no provision in STAAD to input ρ, which is defined in section 184.108.40.206 as a redundancy factor for Seismic Design categories D through F.
STAAD does not calculate the vertical component Ev. However as indicated above, Ev can be calculated based SDS and D. The effect then can be included by appropriately modifying the load combinations.
SELFWEIGHT Y 0.036