Clip angle connections and HSS

[I-beam]

any opinions out there on acceptability of using load
values for double angle clips per AISC when the member being supported
is a HSS 12x4, with 3/4" A-325N bolts..... ? thanks

 

[KootK]

Interesting question:

1) I would prefer to see the connection designed as two, independent, single angle connections such that some of the mechanical differences between a 2L beam web connection and a 2L HSS connection would be mitigated. More on that next.

2) With a 2L beam web connection, you set up a bit of awesomeness whereby, as both angles attempt to rotate, the tops of both angles bump into one another and the bottoms pull against pretension bolts (no pretension with HSS). This positive mechanism is more dubious with HSS I feel.

3) My gut feel is that you probably would be fine to use the tabulated designs for HSS in most cases.

 

[Agent666]

I'm having a hard time envisaging what this might look like and how you might tighten the bolts in side the HSS? However if you are fundamentally talking about a single clip angle either side of the HSS (one to each web), then I'd do exactly what KootK noted in his item 1. If your tables give a similar web thickness for single sided clip angles as the wall thickness of the HSS, then I'd say take 2 x single angle capacity for an appropriate configuration with the same number of bolts. Otherwise just calc it out by hand using the same procedure.

Keep in mind you'd still need to check whatever you were bolting into, for example if its a column flange, your bolts would be quite a bit further apart than say a double clip angle either side of a hot rolled I-section web right next to the column web. I don't see why you couldn't turn the angles inwards though, apart from cutting off access to the column bolting, though you could bolt these before fitting up the HSS maybe. Still don't know how you are doing up the bolts through the HSS webs as no access to the inside of the HSS if hard against a column flange or beam web? Sketch might help if you envisaged a different arrangement to that which I am trying to explain.

 

[I-beam]

My case is a HSS 12x4 to an embedded plate in concrete.
Clips would be field welded to the embed plate, and thru bolted
to the HSS.,,,

 

[Boiler106]

Assuming i understand the case, there is a reduced value for through-bolting to HSS which can be found in 360-05 pg 7-13 which you will likely need to check.

Otherwise, i would assume all of the other limit states would be equal.