Slip Connx. AISC

[palk7 EIT]

Hi,

Attached an image below having channels connected to HSS Column with bolts on sides.. What type of connx. under which this has to be checked for vertical loading.. (Here its a bracing connection), but looking to use this for a straight vertical gravity loaded conxx. in order to avoid any welding or bolting to the main HSS member, does AISC have an example for this sort?

Thank you!

 

[271828]

Please clarify. Do you want this connection to be able to slip parallel to the HSS?

 

[dik]

With the connection at the top other end, it won't slip very much. Can you weld a short WT or plate on to the HSS face?

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[palk7 EIT]

This is the connx. Yeah to resist the vertical load from sliping along the surface of HSS

 

[271828]

What is the magnitude of the load? What is it supporting?

Unless the load is trivial and this isn't supporting a load above an occupant's head, I would weld or bolt to the HSS.

 

[dauwerda]

I am not aware of any AISC provisions that allow this type of connection. In general, in the structural world, if it is not positively attached it is not considered a structural connection.

That said, I know that this type of connection (or similar) are often used in certain industries. I see this type of connection used in the utility industry sometimes, typically for supporting switch operators and other small, lightly loaded equipment with minimal loads on them (when attaching to existing structures and field welding or even drilling is being avoided). You will often also see traffic lights and other attachments to traffic poles simply banded onto the pole, relying on friction similar to this connection also.

You may be able to find some design information guidance in the mechanical realm (ASME?), but I don't think you will find much in the structural realm.

 

[palk7 EIT]

The load is very minimal like 150lbs approx. and the moment it creates.. Yes its somewhat similar to light poles.. But, am looking to ensure that it works for the load through friction, cuz the client dont want to weld or bolt anything to the existing supporting col.

 

[dik]

For that small a load, can you use a couple of powder actuated fasteners?

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[phamENG]

That kind of connection will likely work for such a small load, but you're not going to find a design example. You'll have to do a first principles design and work out all of the components yourself. Give it a go and come back if you get hung up.

 

[RPMG]

This is one of those connections that 'senior' designers like to do. It takes a lot of years of experience to develop these sorts of bad habits. Personally, I would do it correctly and use PAF's per dik's recommendation.

 

[dik]

See attached... I'd still use PAFs... load's almost small enough to use glue...

[URL unfurl="true"]https://res.cloudinary.com/engineering-com/image/upload/v1643665410/tips/HSS_Article_Bolting_HSS_Members_0514_060120_bmttta.pdf[/url]

[URL unfurl="true"]https://res.cloudinary.com/engineering-com/image/upload/v1643665410/tips/C-ConstructionIssues-Hansen-Nov141_lwtkom.pdf[/url]

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik