I'm working on a spreadsheet to do HSS-to-HSS "T" connections with moment loads. I have been searching and searching for something that will give an example of the weld calculation and I'm coming up empty at every turn. AISC design guide 24 example 9.2 addresses this connection great except it just says "assume the welds are sufficient". I downloaded a demo version of RISA connection to examine how they go about this, and while I've tracked down most of the process there's one important part I don't understand. They report a required weld strength "r0" with no explanation of how it's derived. By tweaking inputs, I can see that it is affected by at least the branch depth and the chord wall thickness, but I can't figure out the relationship.
See attached screengrab. For an HSS6x4x1/4 branch on an HSS7x7x1/2 chord with a 5 kip-ft in-plane moment, RISA reports a required weld strength r0 of 2.59 kip/in. Where does this come from??
See attached screengrab. For an HSS6x4x1/4 branch on an HSS7x7x1/2 chord with a 5 kip-ft in-plane moment, RISA reports a required weld strength r0 of 2.59 kip/in. Where does this come from??