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RE: Single Plate Connection of Collectors Procedure

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If you are retrofitting an existing beam to column to beam collector,
you can try to create a cross tie with round bars and grove welds along
the bar to the webs of the beam on each side of the column. You would
have to drill a hole(s) in the column flange or web (depending on the
orientation) to pass the rods through. If the rod passes through
flanges, you would need to make sure they don't fail in compression
buckling, especially if you have a deep column. Here is a crude rep.

          
               ||     || col
               ||     ||
===============||=====||============  top flange
           ____||     ||___
          | +  ||     || + | shear tab
    -----------||-----||---------    solid round bars
          | +  ||     || + |  
    -----------||-----||---------    solid round bars (# rows as req'd)
          | +  ||     || + |
          |____||     ||___|
               ||     ||
===============||=====||============= bottom flange
               ||     ||
               ||     ||

If you are trying to avoid drilling, you can weld on a WT to the beam
webs
(stem horizontal) and go around the flange of the column with your bars.
Again, with a long compression buckling length, it may not work without
larg diameter bars or a structural shape like an HSS (you could slot it
at the WT and fillet weld).


HTH,
-gerard
Santa Clara, CA
-----Original Message-----
From: Markajohn(--nospam--at)cs.com [mailto:Markajohn(--nospam--at)cs.com] 
Sent: Tuesday, November 26, 2002 9:54 PM
To: seaint(--nospam--at)seaint.org
Subject: RE: Single Plate Connection of Collectors Procedure

Gentlemen,

Ben is right, I did get some great responses.  Very Helpful.

Since these are existing connections, adding on to the shear plate seems
a 
little tricky but probably could be done somehow.  If the numbers don't
work 
that way, then adding material top and bottom to make moment connections

looks interesting.  This would help out with the gravity load too.

Thanks Very Much
Mark Johnson PE

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