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RE: Gross overturning

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Common practice?  We have ten structural engineers in our office and we don't adhere to this.  Please feel free to forward this e-mail to your plan checker.


Bob Garner, S.E.


From: Matthew [mailto:sandman21(--nospam--at)]
Sent: Thursday, January 31, 2008 10:30 AM
To: seaint(--nospam--at)
Subject: Re: Gross overturning


It is not the policy; the plan checker is insisting that it is common practice to use a 1.5 F.O.S.  Every design professional, including himself, he was talked to uses 1.5 when using loads at ASD level.  The shear walls range from 1.15-1.2, it would be extremely costly to get a 1.5 F.O.S.  Can anyone offer advice on convincing him that he is wrong? :)


On Jan 31, 2008 10:16 AM, Steve Gordin <sgordin(--nospam--at)> wrote:

There is none.  For seismic, everything about 1.0 is OK.  I usually use not less than 1.2.

It may be a city policy, then you are out of luck.


V. Steve Gordin, SE
Irvine CA

----- Original Message -----

From: Matthew

Sent: Thursday, January 31, 2008 10:08

Subject: Gross overturning


I have a plan check comment stating that a 1.5 F.O.S. is required for gross overturning on any building shear wall from seismic loads at ASD level.  The project is under the 97 UBC; I have been unable to find any code section that requires a 1.5 F.O.S, the only requirement is for earth retaining walls.  Could anyone please comment on where I can find the section?  Or how they have resolved a similar situation?


Thank you