When designing a bolted brace connection, I'm not able to follow some of the internal calculations for the controlling limit state of "Axial-flexure interaction of tab and gusset plates"
This is the configuration
This is the limit state I can't follow specifically the K and L factor derivation - can you please explain/show how these are calculated?
If you change the extension on the below file back to .rcnx it is a model with this connection in it.
BraceConnTest.zip
Thanks.
The important instructions here come from Design Guide 24 Section 5.2. Here's a clip:
In reviewing your example, I still have a question about the K factor used, but making it larger as noted in the DG will only make your situation worse.
Ok - in the configuration i sent the thru plate is 24" long, and I can't find a 26.7" dimension anywhere:
I think it's the combined length, something like this:
Odd - so it's counting air in the buckling length? That doesn't seem right - I'd contend that the buckling lengths would be the portion of the gusset free from restraint - either the average on the centerline (A) or more conservatively the longer free edge (B):
Not air, but the total length of the clamped-together plates like figure 5-5.
Answer Verified By: TLiebhold
Ah- I see. Now it’s just the question of where K is coming from.