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Re: Brace Connection Moment from Eccentricity[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: Re: Brace Connection Moment from Eccentricity
- From: "Joseph Grill" <j.grill(--nospam--at)attbi.com>
- Date: Thu, 9 Jan 2003 19:53:24 -0800
Thanks for the reply. I still need to pursue the thread somewhat though. It's funny that you have a copy of the Second Printing and the equation differences were corrected. I have a copy of the Third Printing and they are still again showing differences. Interesting? With that information, and your mention of the equations for alpha and beta on page 7-109, I would ask for a copy of the errata you are talking about, or where can I get a copy? I wasn't given one when I purchased my copy of the text. Maybe there are other things in the text that a person should be aware.
As far as the column moment goes. I looked in "Blodgetts" book at his list of beam equations near the end of the book. For a beam loaded with a concentrated moment at the mid-span the moment to the beam is M/2 which makes sense with the
(Vc*ec)/2. Also, example 22 is not located at the top of the column (looking at the sketch anyway). The induced moment to the beam, however, is at the end of the beam and is equal to the induced moment of Hb*eb. If the brace were located at the mid-span of the beam, would the induced moment then become Hb*eb/2 or remain Hb*eb.
I'm not saying I'm certain I'm right, but can't justify the 1/2 factor in the moment calculation from the mechanics as I see them. A factor of 2 is a big difference in some of my columns at this point.
Once again, thanks,
Joseph R. Grill, PE
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