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RE: Shear Wall Strength Reduction

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Title: Re: Shear Wall Strength Reduction

This reduction was eliminated as part of the new code adoption process through LARUCP. You can now use the full values from the code tables.


Ben Yousefi, SE, CBO

Chief Building Official

City of Mountain View, CA

(650) 526-7007


From: Tarek Mokhtar [mailto:Tarekmokhtar(--nospam--at)]
Sent: Monday, May 05, 2008 2:33 PM
To: seaint(--nospam--at)
Subject: Re: Shear Wall Strength Reduction




I believe the city of L.A requires that reduction, it started after Northridge


Tarek Mokhtar, SE

Laguna Beach, CA







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My client would like to add a heavier tile roof to his 2-story, wood frame, type V house in the hills of Los Angeles. The second story addition 4-years ago included new plywood shear walls per the 1997 UBC and all evidently permitted. In reviewing the calcs of this addition, I note that the engineer took the Code shear wall values and multiplied them by .75. I cannot find the responsible engineer to query, and I cannot find a Code reference as to why the 25% reduction. These are seismic loads not permanent loads, and the Struc I panels are spec'd with common nails (15/32 Struc I w/ 8d Common @ 3" and 4"). What am I missing?

Charles Laines, S.E.

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