Stiffened Seated Connections - Roll Clips

[sbisteel]

Currently working up some details for large beams framing into WF columns. For instance, a W36x800 framing into a W12 column with ~530k end reaction.
We're going with a stiffened seated connection, however I'm wondering what I should do about the roll clip. AISC states that an L4x4x1/4 is "generally adequate", but doesn't go into any detail about sizing this piece. The small angle doesn't look right. I'm wondering what, if anything, I should figure for sizing this angle?

 

[WARose]

I admit I'm probably behind with OSHA regs.....but if the T/seat was put in first (and connected to the W36), wouldn't that be adequate (by itself) for safety purposes during erection?

 

[sbisteel]

The T seat will be shop welded to the column & everything will field bolt up. OSHA will certainly be satisfied on the 2 bolt requirement.

Does this clip even do anything once the slab is poured?

 

[WARose]

Does this clip even do anything once the slab is poured?

It use to be an alternative to the top angle (i.e. a angle connected to the top flange). But I was never a fan of that. But you will need either one or the other for the final product.

But for erection purposes.....I would think bolting to the seat would be enough.

 

[KootK]

Does this clip even do anything once the slab is poured?

Depends. If you've got steel joists on top of this beam, your beam top flange might be unbraced for the span cantilevering from the first joist back to the column. I don't know if there's a rule about it but I think it's good practice to provide non-slab dependent rotational restraint at the ends of all beams. We do, after all, assume that rotational restraint in all of our calcs. It ought to be a positive and convincing thing in my opinion. I don't necessarily object to the clip that you're currently showing but I do feel as though it ought to be capable of AISC appendix 6 bracing capacity just like any other flange bracing.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

 

[dik]

Are you looking for rotational restraint of the beam? You've got it big time...

Dik