Formulas
Formulas: Rectangular HSS
PDF page 604 · AISC 360-22
Formula 1
The applicability of Equations K3-10, K3-11, and K3-12 depends on the amount of overlap, , where .
Formula 2
(2007), the conversion involves the replacement of the round branch (or branches) of diameter by equivalent square branches of width and the same thickness; then the design rule for chord wall
Formula 3
For round HSS-to-rectangular HSS K-overlapped connections, the conversion method can be used if the chord width ratio, , is less than 0.8 to check local yielding of the branch or branches due to uneven load distribution for .