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HSS truss bearing on wide flange column 3

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hoshang

hoshang

Civil/Environmental
Jul 18, 2012
484
I wonder how one can detail HSS truss bearing on wide flange column. My thought is welding angles on sides of HSS, welding cap plates over wide flange columns, and bolting outstanding legs of the angles on cap plates over the wide flange columns.
Any thoughts would be highly appreciated.
 
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Many ways to do this, the detail you have above can certainly work though not a huge fan as the angles have to be perfectly in plane with the bottom of the HSS unless designed otherwise. I would probably just do steel plates shop welded to both the HSS and W, and field bolt the plates together.
 
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Like Flotsam said there are many ways to do this. It also depends on the type of truss.

I have and large (28m) truss HSS being fabricated up now. To achieve my connection aims I specified the vertical HSS strut to go through the lower HSS chord and then finish with a baseplate. This sounds challenging to fabricate but the members were going to be CNC cut anyway. So a simple solution. The lower chord continue had some loads but they were low as there was only a small cantilever end.
 
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Flotsam7018 said:
Many ways to do this
Click to expand...
human909 said:
there are many ways to do this
Click to expand...
If you could briefly elaborate on the methods available for such a connection, would be highly appreciated.
 
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You need to show the type of truss. Here is one idea.

Capture_s57j2o.jpg
 
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human909 and BAretired,
your detail seems like the wide flange column passing through the HSS truss.
 
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My detail indicates an end vertical, which could be HSS or WF, as you prefer. It is part of the truss. It is spliced to the WF column below using an end plate on each member.
 
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hoshang said:
My thought is welding angles on sides of HSS, welding cap plates over wide flange columns, and bolting outstanding legs of the angles on cap plates over the wide flange columns.
Click to expand...

In my opinion, what you've described is the best way to do it. Two primary reasons:

1) Putting the truss into a bottom chord bearing condition creates a rollover instability problem at the bearing. It's resolvable but I see no reason to invite that unless there's a good reason to.

2) Joist suppliers support their trusses exactly this way. As such, you can bet that it makes sense for economy and erectability.

c01_h8alz1.png
 
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Agreed that the top bearing condition is generally better. I was assuming large loads here in which case I would expect some challenges with that connection.
 
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Hi all
As in KootK's picture, except that lower chord is bearing on the wide flange column, and the [highlight #EF2929]Howe[/highlight] truss cantilevering 0.7m pass the wide flange column. Does this change things?
I wonder how one can detail HSS purlin to HSS truss connection.
 
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I don't see why you couldn't get a top chord to extend past the column the 0.7m if necessary and maintain a top chord bearing detail. It is done all the time. Canam even has tables to determine how far you can have a top chord extend.
 
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jayrod12's approach sounds sensible to me. If the cantilever doesn't work somehow, you could always just brace it on the other side of the column. Otherwise, BAretired's detail with some lateral bracing at the top of the column is probably the way to go.
 
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Hi all,
RE my post in 20 Sep 23 16:24:
I wonder how one can detail HSS purlin to HSS truss connection.

My thought is shop welding a plate above the HSS top chord of the truss overhanging one side of the top chord, welding a plate underneath the HSS purlin set back 1/2 the width of the HSS top chord overhanging two sides of the purlin, and field bolting the two plates. Does this make sense?
 
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Your detail works, but looks unsightly. I prefer this detail for purlin/top chord connection.

Capture_fnfx74.jpg
 
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BAretired said:
I prefer this detail for purlin/top chord connection.
Click to expand...
But your detail has field weld in it.
 
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Of course it does. Is that a problem? In Canada, it is common practice to field weld joists or purlins to beams and trusses.
 
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