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Re: Mandatory Upgrade - when

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In regard to the "5%", you may be thinking of the DSA requirement which is
in the California Building Standards Administrative Code - Part 1, Title 24,
CCR (a code that many CA engineers don't have, even when they do a lot of
school work).  Section 4-309 contains wording about bringing the existing
building up to current code requirements when increasing the existing
lateral force story shear in any story by more than 5 percent, or reducing
the lateral-force-resisting capacity in any story or in the total building
by no less than 5 percent.

Karen Casano
Structural Safety Section
Division of the State Architect
San Diego Regional Office

I'm having trouble tracking down in the code where it states the criteria
when existing structures need to be upgraded due to an addition. I know I've
read somewhere in the code about 5% difference in mass (or demand) to an
existing element based on new addition is the trigger, but I can't find it.
If anyone could point me to it, I'd appreciate it.


Gerard Madden, PE
Design Group Manager

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