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Re: Masonry Infill Walls

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Division 95 of the Los Angeles City Building Code: "Voluntary Earthquake 
Hazard Reduction in Existing Reinforced Concrete Frame Buildings with Masonry 
Infills" provides analysis procedures and retrofit standards for seismic zone 
4.  In addition to a complex general analysis procedure, it includes a 
simplified analysis procedure applicable to some buildings, as defined in the 

It is included in the 1999 Los Angeles City Supplement to the 1997 UBC, 
available from ICBO on their web site (  Go the product store 
and do a search by item number, entering 133A99.

Nels Roselund
Structural Engineer