HSS bolted end plate moment connection

[secvg]

All,

Searching for some information on bolted end plate moment connections for HSS. A concept is attached, I am having a hard time finding literature on how to size the base plates and/or stiffeners as I believe this baseplate would be considered more flexible than a traditional baseplate on concrete. I have already provided a design for splice plates on either side fastened using hollo-bolts but the concept provided is advantageous for construction.

Thoughts? Objections? Any help appreciated.

Thanks

 

[JLNJ]

Think about it in terms of developing the moments out of the members and through the joint. The forces are in the walls of the tubes, so your moment transfer mechanism need to be taking those forces out of the walls and through the joint. Gussets off a closure plate probably don't provide a direct load path, or develop the full strength of either member, or provide the requisite stiffness through the joint.

A kneebrace or stiffened knee might get you what you need. Cover plates top and bottom might do the trick as well. It all depends on the geometry you desire and what your design intent is.

And, while I generally like HolloBolts, they might not get you the strength and stiffness you want since they simply bolt through the face of the connected member and will have limited tensile capacity.

 

[dik]

A thicker plate is generally cheaper than using gusset plates. Can you get by with 2 bolts in lieu of 4?

Dik

 

[BAretired]

Gussets are not the way to go. For one thing, they tend to bend the side wall of the HSS which is probably thinner than the base plate. I agree with dik that it is best to size the base plate for the moment.

Make sure you consider the radius at the corners of the HSS in determining the length of cantilever.

BA

 

[GC_Hopi]

A few people alluded to this but it sounds like you are just asking about a cap plate design for an hss. There are AISC or steel tube institute design guides. Here is a article on hss moment connections, the checks would be similar for an hss beam.

https://steeltubeinstitute.org/hss/2014/10/07/wide-flange-beam-hss-column-moment-connections/