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RE: complicated simple connection

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Contact Lindapter North America on 888 724 2323. They can offer you a sytem
which will enable you to ship the canopy in parts and then secure the beams
together without any field welding. Alternatively look at the web site http:
www.lindapter.com

> -----Original Message-----
> From:	Michael Hemstad [SMTP:mlhemstad(--nospam--at)yahoo.com]
> Sent:	Tuesday, August 21, 2001 9:53 PM
> To:	seaint(--nospam--at)seaint.org
> Subject:	complicated simple connection
> 
> I am designing a canopy where the architect insists on
> using W4x13 members crossing in the same plane. 
> Unfortunately, the client insists on following the
> architect.  Most of the connections can be simple
> shear connections, but I'm having a difficult time
> coming up with a clean detail.  The reactions are not
> high, perhaps 1500 pounds at the most.
> 
> I'm considering using a shear tab welded to the
> supporting beam, maybe 1/2 inch thick and 2 3/4 inches
> wide (the "T" dimension of these beams) with two bolts
> into the web of the supported beam.  If I am to avoid
> coping the supported beam, the length of the tab will
> be about:
>    2       half of supporting beam
>    1/2     gap
>    1 1/2   end distance for bolt
>    3       bolt ga. (horizontally)
>    1 1/2   end distance for bolt
>    -----
>    8 1/2 inches.
> 
> This is, as I said, not particularly clean.  In fact,
> it's really ugly, but it can be erected.  I have
> concerns over stability, which is why I'm considering
> a 1/2 inch plate.  (If I use this detail, does anyone
> have suggestions on how to check the stability?)  
> Instead of the plate, it could also be done, I
> suppose, with a 3x3 angle 8 1/2 inches long, sticking
> out of the web of the supporting beam.  This would be
> even uglier, but more stable.
> 
> Another idea might be to cope the supported beam and
> weld a 6 inch long, 2 1/2 inch high plate across its
> end, to bolt into the web of the supported beam. 
> However, I have two lines of supported beams framing
> into twelve lines of supporting beams (i.e. 12
> double-sided connections on each stringer line), so
> fabrication tolerances will catch up to me.  It also
> will be somewhat difficult to erect.
> 
> The last idea I have is to weld a 3x3 angle, maybe 5
> inches long, into the web and under the top flange of
> the supporting beam, sticking out about 3 inches.  I
> would have what amounts to an erection bolt in the
> vertical leg, through the web of the supported beam,
> and field weld part of the flange of the supported
> beam to the horizontal of the angle.  The toe of the
> angle would need to be ground to fit the fillet of the
> supported beam.
> 
> A lot of ideas, none of them great.  I wouldn't care
> so much except I've got a lot of this type of
> connection on this canopy, and maybe 6 more similar
> canopies  to come.  If anybody has any better ideas,
> please let me know.  Thanks in advance.
> 
> Mike Hemstad, P.E.
> TKDA
> St. Paul, Minnesota
> 
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