Vertical Seismic Component QE

[akamike]

How do I calculate the vertical seismic component QE per IBC? The UBC had a formula used to calculate this component but I can't find one in the IBC.

(I'm looking at a building that is 6 stories with concrete slab floors and masonry bearing/shear walls. I'm doing a spot check on a couple of walls on the ground floor, so it's just a 'quick' hand calc for now - I won't be modeling the building just yet.)

 

[aggman]

Qe is the effect of horizontal seismic forces in IBC. This can be calculated using Equivalent Lateral Force Procedure, Modal Analysis, etc. The vertical component is 0.2*Sds*D. Reference Section 1617 IBC 2003. Also check out ASCE 7-02.

 

[JAE]

Check out these threads that discuss the vertical component effect from seismic:

Thread176-98527

thread487-121459