RE: R value UBC97

David,

 

I have spoke with another engineer who thinks R would be 5.6 under building frame system item 4a.

 

Do you mind clarifying R=4.4. Why would I assume the diagonal brace takes gravity loads?

 

Jeff

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From: David Topete [mailto:d.topete73@gmail.com]
Sent: Thursday, November 29, 2007 1:56 PM
To: seaint@seaint.org
Subject: Re: R value UBC97

Assume the diagonal does carry gravity load, and use R=4.4 (bearing wall system, 4a) in the direction of the brace frame.  5.5 for the other direction (wood shear walls).

On Nov 29, 2007 11:16 AM, Jeff Smith < jeffsmith7@comcast.net> wrote:

I searched the archives and I am still unclear. I have a new wood framed residence that needs one story braced frames in one direction, mainly due to OT uplift requirements. The 2 vertical columns will take gravity load, but the top chord and single strut diagonal chord will not. What R should I use? We are submitting this in California before the end of the year.

 

Thanks,

 

Jeff

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David Topete, SE