Section modulus top and bottom. In cases where high shear and high moment coexist, e.
I'm only talking bending about one axis here.
The PNA is defined as the axis that splits the cross section such that the compression force from the area in compression equals the tension force from the area in tension.
For y-y bending, the plastic neutral axis passes through centroid due to the symmetry.
A Neutral axis to the extreme fiber.
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Figure 3 gives some typical examples of beam-to-column connections.
That's what I get for working from dim memory.