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RE: drift calculation, 1997 UBC using ASD
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- Subject: RE: drift calculation, 1997 UBC using ASD
- From: "Alexander Sasha Itsekson" <sasha(--nospam--at)ida-se.com>
- Date: Thu, 11 Nov 1999 09:17:28 -0800
I am not sure of that. Why would you calculate "delta s" (elastic deflection) using ultimate level forces, and then use that meaningless term to determine your inelastic "delta m"? So far I have not heard any arguments that show would me that the above statement makes sense. As far as erratas concern, I checked the ICBO web site and I could not find any erratas to the third printing of the UBC. There is no mention of the fourth printing of the UBC either. Sasha Itsekson -------------------------------------------------------------------------- 34 Message:0034 34 -------------------------------------------------------------------------- From: Mlcse(--nospam--at)aol.com Subject: Re: drift calculation, 1997 UBC using ASD To: seaint(--nospam--at)seaint.org In a message dated 11/10/1999 4:59:56 PM Pacific Standard Time, mtv(--nospam--at)skilling.com writes: << You are correct. The erratum is itself an error. The original text was correct; deflections are to be checked using strength-level loads. I suspect that someone at ICBO *thought* the section reference was wrong and prepared the erratum. The codewriters that I've spoken to all agree that the original text was correct. All other U.S. codes (including the 2000 IBC) are clear on this point. >> The First printing of the 1997 UBC was originally correct regarding using strength design for calculating deflections when using ASD. The second printing of the 1997 UBC was incorrect. The errata was a mistake The third printing of the 1997 UBC I think was also incorrect (I don't believe they had picked up the errata mistake at this printing). The Fourth printing of the 1997 UBC is correct I believe, the same as was stated in original the first printing. Michael Cochran
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