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Re: HSS to HSS moment connection

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There are several reasons why HSS-to-HSS moment connections are not in the HSS

1) Take a look at the complexity of the HSS Manual Chapter 5 W-shape to HSS
connections so that the thin walled HSS doesn't exceed one of the many limit

2) Take a look at the HSS Manual Chapter 8 round HSS to round HSS truss
connections, and their design procedures in the HSS Specification.

In short, the connections end up being so large an inefficient, they have a high
probability of getting in the way of something else in the structure.

If I absolutely had to engineer an HSS-to-HSS moment connection, I would use an
end-plate moment connection.  I would weld a large plate to the side of the HSS
column, with bolt holes outboard of the HSS.  I would then weld a matching plate
onto the end of the HSS beam, with bolt holes outboard of the HSS.  If I can
come up with a geometry such that the bolt holes are outboard of both HSS enough
that they can be installed, I would then look at all the many possible limit
states.  I would likely end up with many large diameter bolts, thick end plates,
and lots of stiffeners extending in-line from the HSS side walls.

The resulting connection would be so remarkable, I would then paint it magenta
and fuschia, call it a sculpture, and blame it on the Architect.


Rick Drake, SE
Fluor Daniel, Aliso Viejo, CA


Ken Peoples <lvtakp(--nospam--at)> on 07/18/2000 07:42:59 AM

Please respond to seaint(--nospam--at)

To:   seaint(--nospam--at)

Subject:  HSS to HSS moment connection

We do steel detailing and design so we see both ends
of the connection design.  On one of our current
detailing projects, we are being asked to come up with
a moment connection detail for a HSS10X10X1/2 beam to
a HSS10X10X3/8 column for an AESS condition (thats too
many SS's!).  No exposed plates or erection seats are
allowed.  We suggested using an internal seat angle
with a short (say 2" horiz leg) but since there are
tubes at both ends of the beam, the design engineer is
afraid of the difficulty getting the members in
(having to lean the column out to get the bottom
flange of the beam past) - which could be a valid
concern.  I have three questions:
1. What else can be done to make an erection seat fo
this type of connection?  Any e-mailed details would
be appreciated.
2. Do I shop weld a backer bar to the inside of the
tube to make full pen welds to?
3. Why isn't this situation covered in the HSS manual?
Thanks in advance for your comments
Ken Peoples, P.E.

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