HSS column to HSS beam moment connection

[JStructsteel]

Anyone have a good detail/design for HSS column/beam moment connection? Do you include a seat angle on the column? I was thinking it would need to be bolted, limited access on one side. End plate connections?

Thanks

 

[dik]

How much load? and if the beam is a W section or an HSS section. If a W section, I often use a ST welded to the HSS column and bolts to the beam. If HSS beam, I'd likely use end plates on the beam bolted to a plate on the face of the column.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[JStructsteel]

They both are HSS shapes. I think there would be room to get a bolt behind the beam. Its close to a wall.

 

[dik]

Can you use an end plate on the beam and a plate on the face of the column? You need about 3" clearance behind the beam or column for the end plate. You may have to add stiffener plates to the side walls of the HSS column at the location of the top and bottom of the HSS beam. I'll add stiffeners... All welds, fillet welds... pretty simple and economical.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[dik]

Something like (found an old detail) Use fillet welds and flare bevel welds... have to move the bolts a bit...:

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[JStructsteel]

Any reason the plates could not be on top, and the beam over the top of column.

 

[dik]

Nope... works as well... I would relegate the stiffener plates to the front edge of the connectionto prevent the walls of the tube from crushing. I'll see if I can find a recent detail... this was a project where they had a portal frame with high moments in both directions but couldn't weld on site and it was HDG...

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[dik]

Found one... Big Moment...

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[KootK]

I've used this detail successfully for some small scale stuff. It requires same thickness members and field welding which are not always feasible. On the plus side, it is very adaptable to field tolerance issues, creates a nice, clean shear load path between the webs of the two members, and generates a fairly rigid connection compared to other alternatives . Based on experience with wide flange connections, some will object that it's not an efficient connection because the flanges are not directly connected. I would argue that:

1) That is less important for HSS connections owing to the relatively thin flanges and thick webs of HSS members.

2) Shear load paths in HSS connections become, relatively speaking, more important than they are with wide flange connections.

3) If you can't get the C-shaped welds to transfer you moment successfully, you should probably be looking a different members anyhow.

At a much larger scale, there are connections with more robust load paths available. You see that kind of thing used a lot for seismic moment frames in Japan etc. They're costly, however, and I'm fairly sure that's not the kind of project that you're dealing with.

 

[KootK]

You'd also not be the first to do something like this if field welding is acceptable.

 

[dik]

My problem was HDG and couldn't weld... bolts only... your connection is a little neater... moments were high, so had to support the tube wall...

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[JStructsteel]

Im stuck with bolts, not enough room on one side to do a good weld. Thanks.

 

[dauwerda]

The flange plates that Dik suggested are very typical for substation structures. They are used on the side of columns and ends of beams just as often as the are used on the top of the column and bottom of the beam.

 

[dik]

done a bunch of them, too... maybe that's where I got the idea... Actually, I was concerned about the HSS wall crushing under high load... didn't analyse them... just connected them so they worked.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik