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RE: IBC 1617.1.1 D=?

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         The effect of the Seismic has vertical and horizontal components.
         In UBC Ev was the vertical component (= 0 for ASD design)
         IBC does not make a distinction between ASD and LRFD
         Practically speaking, if using allowable stress design and using the alternate basic combinations: (1605.3.2)
         when effect of Seismic and Dead is additive, formula 16-17 would generate:  D(1 + .2Sds) + L + S + E/1.4
         when effect of Seismic and Dead counteract, formula 16-18 would generate:  D(0.9 - .2Sds) + E/1.4
         Francois Rambau
         Star Building Systems
-----Original Message-----
From: Ken Peoples [mailto:kspeoples(--nospam--at)]
Sent: Monday, March 18, 2002 2:03 PM
To: Seaint
Subject: IBC 1617.1.1 D=?

I am trying to go through a design using the new IBC 2000 and I have a question regarding Equation 16-28 (page 357).  I thought I understood what they were doing until I read "D = The effect of dead load".  Is this correct or was it meant to be "The effective dead load"?  I guess it is a similar question for "QE = The effect of horizontal seismic forces".  If it is correct as written, I don't think I understand the formulas.
Thanks in advance for your help,
Kenneth S. Peoples, P. E.
Lehigh Valley Technical Associates
1584 Weaversville Road
Northampton, PA 18067-9039
Phone: (610) 262-6345
Fax: (610) 262-8188
e-mail: kpeoples(--nospam--at)