Matthew,
Look at load combinations, Section 1612, as referred to in 1630.8. 12-10 and 12-16.1 are for ASD.
V. Steve Gordin, SE
Irvine CA
Irvine CA
----- Original Message -----From: MatthewSent: Thursday, January 31, 2008 11:06Subject: Re: Gross overturningWe asked for code sections which stated the F.O.S. and 1630.8 was the code section he gave. Does it matter that we are using ASD level loads? I see nothing stating that an increase in F.O.S. is required because ASD loads were used but I just want to make sure. Thank you.
On Jan 31, 2008 10:53 AM, Steve Gordin <sgordin@sgeconsulting.com> wrote:
If not amended by the city, UBC/CBC Section 1630.8 governs. It essentially says that the issue of seismic overturning is taken care of by checking against load combinations 12-6, 12-10 and 12-16.1.V. Steve Gordin, SE
Irvine CASent: Thursday, January 31, 2008 10:30Subject: Re: Gross overturningIt 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@sgeconsulting.com> 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: MatthewSent: Thursday, January 31, 2008 10:08Subject: Gross overturningI 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