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RE: Seismic Loading?

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The 0.2*Sds*D is a vertical component.  So, include it in your analysis and in the load combinations as additional “E”, but not as a lateral force... it is vertical so add it to your vertical load.



Bruce D. Holcomb, P.E., S.E.

Structural Engineer


Butler, Rosenbury & Partners

300 S. Jefferson, Suite 505

Springfield, MO 65806

ph. 417-865-6100

fax 417-865-6102

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-----Original Message-----
From: Daniel Boltz [mailto:dboltz(--nospam--at)]
Sent: Friday, January 07, 2005 12:55 PM
To: seaint(--nospam--at)
Subject: Seismic Loading?


I've always taken my seismic shear loads from the equivalent lateral force procedure V = Cs*W = E for use in the Load Combinations of IBC, Section 1605.  Should I be using Equations from Section 1617 for the "E" load in the Load Combinations?  This may be a dumb question, but what is Qe in Equation 16-28?  The notation description says "The effect of horizontal seismic forces." this the same as saying Qe = V from either Section 1617.4 or 1617.5?


I've never added in an additional 0.2*Sds*D to the calculated V = Cs*W equation into the Load Combinations of IBC.








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