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RE: 25% of Live Load added to Lateral

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It is added to the overall seismic mass of the building ONLY for areas that are designated as storage per the code provisions.  Thus, if you have one ROOM on the 4th floor of a 10 story building that is storage, then only for that THAT portion of the live load would you add the 25% to teh seismic mass...all other locations would have zero percent of the live load added to the seismic mass.
At least that is how I read it.
Adrian, MI
-----Original Message-----
From: Dennis Wish [mailto:dennis.wish(--nospam--at)]
Sent: Friday, July 18, 2008 8:07 PM
To: seaint(--nospam--at)
Subject: 25% of Live Load added to Lateral

If one floor in a multi-story building is to be used for light or heavy storage, is the 25% of the floor live load added only to the level that is used for storage or is it added to all floors?


Dennis S. Wish, PE


Dennis S. Wish, PE

California Professional Engineer

C-41250 Exp. 3/31/09

Structural Engineering Consultant

La Quinta, CA 92253