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Slip Connection Required?

Slip Connection Required?

Slip Connection Required?

(OP)
Hi All,

I have a condition where a wide-flange beam is resting on 2 perpendicular HSS beams. Is this a condition where one of the connections should be a slip connection to allow for thermal expansion? I feel like an all welded connection for both would constrain the top beam. Or is this a case of overthinking about the problem? If a slip connection is required, what is the best detail in this situation?

RE: Slip Connection Required?

It looks like the W16 is cantilevering out 10 or so feet past the HSS, is that correct?

Brian C Potter, PE
Simple Supports - Back at it again with the engineering blog.

RE: Slip Connection Required?

(OP)
The W16 is cantilevering about 8 feet, correct. There is no net uplift due to the exterior wall and loads from the roof.

RE: Slip Connection Required?

I'd probably still design the connection at the other end for some nominal uplift value, based on the size of it (if nothing else for during erection, when the dead load won't be in place and workers will be walking around on the deck).

re: welding at each end, I wouldn't be worried about thermal expansion in a beam this size - worst case your HSS deflects outward a tiny bit, while remaining braced by the beam.

Brian C Potter, PE
Simple Supports - Back at it again with the engineering blog.

RE: Slip Connection Required?

Where is the differential thermal expansion going to occur?
I can't tell from your sketch what the source of temperature difference would be.

RE: Slip Connection Required?

How big? and is the steel enclosed with the envelope? Does any steel project beyond the envelope (a bigger problem)?

Dik

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