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Re: Brace Connection Moment from Eccentricity
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 Subject: Re: Brace Connection Moment from Eccentricity
 From: "Joseph Grill" <j.grill(nospamat)attbi.com>
 Date: Thu, 9 Jan 2003 19:53:24 0800
Scott,
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 7109, 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 midspan 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 midspan 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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 References:
 Brace Connection Moment from Eccentricity
 From: j . grill
 Re: Brace Connection Moment from Eccentricity
 From: Scott A. Dunham, PE
 Brace Connection Moment from Eccentricity
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