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Side-hang beams to columns connection detail 1

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Rutherford3rd

Rutherford3rd

Civil/Environmental
Oct 30, 2022
4
Please suggest the connection detail for replicating this. See the photos. The frame is an "exoskeleton" for a two-floor tiny house with 20 foot by 20 foot footprint. Member size for all six columns and all six load-carrying beams is W10x33, for which flange thickness is 0.435 inches. As the photo taken from the side shows, no bolts can be seen from the exterior. The architect apparently wanted a clean look at those joints, although bolt heads can be seen in the beams to pick up ledger connections. Floor one and floor two framing, and roof joists are all wood and are hung from wood ledgers hung to the beams.

But focus please on the beam-to-column joints. How would you detail that without bolts showing from outside, and have bolted connections? The 3D model views show the condition, flanges touching flanges.



IMG_2261_vjmguk.jpg
IMG_2260_cdzmy3.jpg
Screenshot_2022-10-30_085522_sg1o9g.jpg
Screenshot_2022-10-30_085711_etk4is.jpg
 
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In my area, this would likely be field welded.
 
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I'm curious how you are getting the lateral loads out at the front of the house? (down hill face)
 
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I'd put horizontal stiffener plates inside the column flanges that align parallel with the beam flanges and a vertical shear tab centered on the column, welded to the column web and stiffener plates, that extends to a simple shear connection in the beam. Make the column take the eccentric load in bending rather than the beam in torsion.
 
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As re field-welded, perhaps it was, but consider there are only four contact points, with the beam flanges against those of the columns. And without clips of some type, field-welding requires somehow temporarily fixing a 600 pound member in the air while you clamp it all up in preparation for welding. This is why I am trying to puzzle out a bolt-up.

Three views are attached here of the prototype, in progress and finished. The entire "front," the cantilevered view side, is windows with zero lateral bracing. The rear side is braced by plywood-faced wood framing fixed at sides and top to steel, the sides are well braced at least until the cantilever reach-out happens.


Screenshot_2022-10-20_224535_rndnh5.jpg
IMG_2264_vsqhlw.jpg
 
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Weld a fitting on the inner sides of the columns that allows the beams to be bolted to the fitting.
 
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OK, so here is my interpretation of what was suggested above. A three-piece weldment of components is welded to the column, and the beam has a coped length of 3x3x1/4 angle welded to its bottom flange and web. The parts join up and are fixed
Screenshot_2022-10-30_124845_t4gfzw.jpg
Screenshot_2022-10-30_124611_r3kmam.jpg
Screenshot_2022-10-30_125014_jmxu95.jpg
with 3/4" bolts.
 
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Rutherford3rd said:
The entire "front," the cantilevered view side, is windows with zero lateral bracing. The rear side is braced by plywood-faced wood framing fixed at sides and top to steel, the sides are well braced at least until the cantilever reach-out happens.
Click to expand...

So you have designed it as a three sided building from a lateral standpoint?
I would discuss field welding versus bolting with your steel fabricator/installer before you blow too many hours on this.
 
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I did not design it. Someone else did and it's been built and standing for over two years. The pics show it. We want to do something similar but with whatever improvements or changes that develop.

I will certainly discuss before but please suggest the welding when it's just the four points contact, flange edge to flange edge. Thanks.
 
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I think Rutherford3rd is on the money with that sketch above, seems to be the best way to do it

I think it's a neat connection, never seen it before but I will keep it at the back of my mind next time something like this comes up
 
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