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RE: 2007 CBC special seismic load combinations

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Wait a minute.....is there a supplement to the CBC which deletes 1605.4
also???

Mark D. Baker

-----Original Message-----
From: William Haynes [mailto:gtg740p(--nospam--at)gmail.com] 
Sent: Tuesday, May 27, 2008 9:42 AM
To: seaint(--nospam--at)seaint.org
Subject: Re: 2007 CBC special seismic load combinations

I have already come across this problem before and found that section
1605.4 has been removed by the 2007 supplement to IBC 2006.

WH

On Tue, May 27, 2008 at 12:09 PM, Yousefi, Ben
<Ben.Yousefi(--nospam--at)mountainview.gov> wrote:
> This is a good question. I am also kind of puzzled by the language in the
> IBC/CBC requiring that both the LRFD and ASD design be based on the same
> load combination! I personally hope this is an oversight and not a
> deliberate attempt at superseding ASCE 7. Substantial time an effort was
put
> in creating section 12.4 of the ASCE in order to consolidate and simplify
> the load combinations involving seismic loads. Equations 5, 6 and 8 along
> with section 12.4.3.3 of the ASCE 7 make a lot more sense to me than the
IBC
> provision.
>
>
>
> Ben Yousefi, SE, CBO
>
> Chief Building Official
>
> City of Mountain View, CA
>
> (650) 526-7007
>
> ben.yousefi(--nospam--at)mountainview.gov
>
> ________________________________
>
> From: Mark D. Baker [mailto:shake4bake(--nospam--at)earthlink.net]
> Sent: Saturday, May 24, 2008 11:12 AM
> To: seaint(--nospam--at)seaint.org
> Subject: 2007 cbc special seismic load combinations
>
>
>
> I've been away from the list for quite some time, I have looked through
the
> archives for messages on this topic and found none.
>
>
>
> Should we be using the CBC Equations 16-22 & 16-23 or ASCE 7-05  section
> 12.4.3.2 Equations 6 & 8?
>
>
>
> I do not find any reference in the CBC which requires the use of the ASCE
> equations. My confusion comes from the Seismic Design Manual Volume 2, Ex.
2
> using the ASCE equations for the uplift of shear panel on a beam.
>
>
>
>
>
>
>
> Thanks,
>
>
>
> Mark D. Baker
>
> Baker Engineering
>
>
>
>
>
>
>
>
>
>



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