Offset HSS Header Connection Detail
Offset HSS Header Connection Detail
(OP)
Im looking to improve my offset header connection details, and wondered if anyone had one for a condition where the curtain wall remains continuous past a column (hss or wf).
by offset, i mean the centerline of the hss header (lintel) is set a distance away from the exterior column line.
thoughts?
by offset, i mean the centerline of the hss header (lintel) is set a distance away from the exterior column line.
thoughts?






RE: Offset HSS Header Connection Detail
RE: Offset HSS Header Connection Detail
It might help if you posted a sketch of your current detail. Then we could suggest improvements.
BA
RE: Offset HSS Header Connection Detail
I'd appreciate your input.
RE: Offset HSS Header Connection Detail
1). moment endplate connected outrigger with the header siting on top of the outrigger with a small tie back atop the header. Wind column would be somewhere near midspan sitting on the header
2)moment endplate connected outrigger with the header spanning between the outriggers simple span. Wind column would be somewhere near midspan sitting on the header
For your situation, option 2 here is probably more suited.
I like the endplate moment connection better than your detail.
RE: Offset HSS Header Connection Detail
RE: Offset HSS Header Connection Detail
Mike McCann
MMC Engineering
RE: Offset HSS Header Connection Detail
RE: Offset HSS Header Connection Detail
Other way is with the header spanning (into page) b/t outriggers on columns on either side of opening.
Also, I didn't show the tie-back on top of the header, which I use to resist torsion caused by wind loading on wind columns that rest on the header
RE: Offset HSS Header Connection Detail
OP said he can't have anything below the HSS section. Did you intend the section detail as upside down?
Mike McCann
MMC Engineering
RE: Offset HSS Header Connection Detail
RE: Offset HSS Header Connection Detail
Yea, I guess you could "hang" it.
But, if the header spans between outriggers than you could make it so that nothing is below the outrigger.
RE: Offset HSS Header Connection Detail
I have cases ranging from vertical Vuy=2k for an HSS6x6 to 18k for an HSS20x8x3/8. I also have Vux=1.5 to 8k.
Hmmmm....
RE: Offset HSS Header Connection Detail
If my description is not clear, I could provide a sketch.
BA
RE: Offset HSS Header Connection Detail
My solution would be just to project a plate out from the column, and use end plates on both headers, bolted to the projected plate. All that site welding could be avoided.
RE: Offset HSS Header Connection Detail
I think you are more or less describing the same thing that I am only mine was all bolted.
You're idea is probably better.
In the end, it's still an endplate moment connected outrigger.
RE: Offset HSS Header Connection Detail
Sorry Toad, I missed your concept.
BA
RE: Offset HSS Header Connection Detail
i like your idea of the endplate and bolting together, however, the two headers frame into the same outrigger and i think that would cause erection problems where the bolts are shared.
BA - good idea, however, hss lengths have already been ordered.
i also have conditions at the corners where the hss needs to continue past the column to cantilever a short distance to the building corner.
right now, i think i will use a W shape outrigger with a welded single angle conn with flange plate top and bottom to restrain the hss. im thinking that i can get away with a 1/4"-3/8" plate on the bottom.
RE: Offset HSS Header Connection Detail
This is done often for clip angle beam connections in a shared column web.
RE: Offset HSS Header Connection Detail
the bottom tie back could probably be done a little better to allow for fitup.
Missing a few callouts and welds on this prelim version, but you get the point.
RE: Offset HSS Header Connection Detail
Cutting and chipping flat to the web of a W is a pain.
RE: Offset HSS Header Connection Detail
RE: Offset HSS Header Connection Detail
RE: Offset HSS Header Connection Detail
Advantages - Can be configured for field bolting and no field welding. Contractor can set the beam in place, doesn't have to hold it in place. Outrigger is hidden behind tube.
Disadvantages - Fabrication is a little tricky. Not good for CW rotation
RE: Offset HSS Header Connection Detail
I also have a fabricator friend I would bounce it off, every SE should have at least one steel fabricator's number in their phone...
Lots of ways to skin this cat.
Toad- Was the built-up section for wind at a curtain wall or because that was a crane? Your sketch was way better than the ones missing from most posts...
RE: Offset HSS Header Connection Detail
There was a wind column that sat on top of the door header.
Although conservative, I designed a wideflange to carry the vertical load and a pair of channels (bottom one not shown in sketch) to carry the wind load.
It work out great because the siding girts on the building were channels on the same depth as the caps on the beam. Everything matched up nice.
RE: Offset HSS Header Connection Detail
The worst is seeing an old set of drawings or going to the site and then second guessing yourself. Man, why'd I do it THAT way?? I just did that on a job that is in a building with exposed steel and has very high visibility to the public, and it was probably 10 years ago that I designed it and at the beginning of my career. Only a couple of things where I scratched my head a little...
RE: Offset HSS Header Connection Detail
Is it Friday yet?
RE: Offset HSS Header Connection Detail
This would avoid sharing of bolts and extended cap plates as well as allow a similar connection where you need the header to cantilever past the outrigger.