OK, my two cents worth:
I have called for and had executed, welded butt splices for
HSS shapes. They put straight backer bars in, as long as they could be
between the rounded corners. The flats of the sides thus got a full-pen
weld. At the rounded corners, they ground a bevel on one piece (the top
piece), and executed a partial-pen weld. If appearance matters, I would
If the splice will be hidden, I would use 4 angles, L2 1/2x2
1/2x5/16, fillet welded all around. This completely eliminates fit-up
concerns. Two angles can be shop welded on each piece, and will serve
as alignment guides for field erection. This is by far the simplest splice
if looks don't matter.
The idea of fitting a tube inside to act as an all-around
backup bar, I'm sure, could be done. But I don't think the pain is worth
From: "Dave Gaines" <firstname.lastname@example.org>
Subject: Re: FPW - HSS column splice
This is a multi-part message in MIME format.
Why not do a full pen weld of the two sections?
----- Original Message -----=20
From: Joe Grill=20
Sent: Wednesday, June 07, 2006 3:05 PM
Subject: HSS column splice
I'm doing a column splice detail. I'm told that lengths over
20' in a =
5x5 tube steel aren't available around here. The splice will
be just =
above a floor diaphragm, and I will be able to block the
column into the =
floor framing pretty well. I'm considering using a sleeve from
section of HSS that is larger than the column
Anyway, will an HSS 5x5 fit inside an HSS 5.5x5.5x1/4 sleeve?
anybody else out there done this?=20
A better fix would be a sleeve inside your column that would
serve as a
backup bar. You could do a CP joint from the outside. The
sleeve could be an
HSS section or a bent plate.
I have seen HSS columns CP welded to girder flanges without a
backup bar but
not a column splice. I'm sure it could be done,
Another option would be a cap plate between the lower shaft
and the upper.