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FW: UBC Eq. 30-1

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Thanks for the clarification Rick.  I was reading the code literally even though I agreed with Gerard about the Ev acting either up or down.  Since I hadn't seen an errata covering the apparent discrepancy, I believed that that was the intent of the code writers.

Curt La Count
Jacobs Engineering
Portland, OR

-----Original Message-----
From: Rick.Drake(--nospam--at) [mailto:Rick.Drake(--nospam--at)]
Sent: Thursday, September 12, 2002 8:50 AM
To: seaint(--nospam--at)
Subject: RE: UBC Eq. 30-1

E-sub-v is defined in the 1997 UBC as "an ADDITION ... to the dead load
effect."  SEAOC, as explained in the 1999 Blue Book, intended that E-sub-v
be applied in both vertical directions.  In other words, add E-sub-v for
most load combinations and subtract E-sub-v for "uplift" load combinations.

The 2000 IBC makes this clear.  The 2000 IBC also applies it to both
working stress design and strength design.  ASCE 7-02 will also apply the
vertical earthquake in both vertical directions for both working stress and
strength design.  ASCE 7-02 will be adopted by reference by the next
generation of IBC and NFPA Building Codes.


Rick Drake, SE
Fluor Daniel, Aliso Viejo, CA

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