Local HSS Branch Connection Analysis
Local HSS Branch Connection Analysis
(OP)
I have an HSS (rectangular tubing) cross connection and I am trying to perform a local check on the main member.
This is for a fork pocket analysis on a frame. The main beam (10x6x3/8 tubing) is tied into two branches (6x6x3/8 tubing). Please see attached sketch.
I am trying to perform a local check on the fork pocket (10x6x3/8 tubing) and am applying equation K3-16 for out of plane bending in the AISC 13th edition.
I have 2 questions:
1.) Is this the correct equation to anlalyze the fork pocket HSS local section?
2.) Is the Hb variable (overall height of rectangularr HSS measure in plane of connection) in equation K3-16 the length of the branch connection? Or the height of the cross section?
Thanks in advance.
This is for a fork pocket analysis on a frame. The main beam (10x6x3/8 tubing) is tied into two branches (6x6x3/8 tubing). Please see attached sketch.
I am trying to perform a local check on the fork pocket (10x6x3/8 tubing) and am applying equation K3-16 for out of plane bending in the AISC 13th edition.
I have 2 questions:
1.) Is this the correct equation to anlalyze the fork pocket HSS local section?
2.) Is the Hb variable (overall height of rectangularr HSS measure in plane of connection) in equation K3-16 the length of the branch connection? Or the height of the cross section?
Thanks in advance.






RE: Local HSS Branch Connection Analysis
Can you add internal and end plates to remove out-of plane bending effects?
tg
RE: Local HSS Branch Connection Analysis
RE: Local HSS Branch Connection Analysis
Refer to AISC Design Guide 24 for more information and examples.
http://www.FerrellEngineering.com
RE: Local HSS Branch Connection Analysis
RE: Local HSS Branch Connection Analysis
It is an out of plane moment connection.
I found an example in AISC Design guide 24 that applies.
The only difference is that my fork pocket connection is at the end of the HSS (10x6x3/8) member.
I cannot find any discount factor for this situation. Should this be considered?
Thanks again!
RE: Local HSS Branch Connection Analysis
http://www.FerrellEngineering.com
RE: Local HSS Branch Connection Analysis
I have also run a local FEA check on the fork pocket connection.
My concern is the local failure of the fork pocket tubing walls at the edges.
Questions:
Is there an easier way than performing an FEA each time on the fork pockets?
Is there any specific guideline for fork pocket design / sizing?
The aspect ratio "B" falls outside the limitations of equation K3-16 for this connection.
Thanks in advance.