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Re: residential pier foundation design

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Nels,
 
Division 92 is the "voluntary earthquake hazard reduction in existing wood frame residential buildings with weak cripple walls and unbolted sill plates."
 
The "seismic design provisions for hillside buildings" is section 1666 of chapter 16 of the 1999 Los Angeles Building Code, and they are mandatory for new construction and alterations.
 
Regards,
 
Oshin Tosounian, S.E.
Los Angeles, CA
----- Original Message -----
Sent: Wednesday, May 09, 2001 4:31 PM
Subject: Re: residential pier foundation design

Jeff and Oshin,
 
The Los Angeles City Hillside Dwelling Code (Division 92) is available from ICBO as part of the L.A. City Code book package (ICBO Item 133A99).  It is a voluntary seismic retrofit ordinance for dwellings.  It is applicable to houses built on slopes of 3:1 or steeper.  However, If, on your 2:1 slope project, you are contemplating non-rectangular plywood sheathed shear walls (Non-rectangular because of sloping or stepped sole plates), you would benefit from reviewing the rules in Division 92. 
 
Non-rectangular plywood-sheathed shear walls are not conventional wood-frame construction, and they led to serious structural damage in the Northridge Earthquake.

Nels Roselund
Structural Engineer
 
<Oshin wrote: I suggest you take a look at the City of Los Angeles "Seismic Design Provisions for Hillside Buildings". R=4.5 and no plywood shearwalls in the downhill direction.>