Panel-Zone Shear Under High Column Axial (AISC 360 J10-10/J10-12)
The axial reduction steel-panel-zone-shear flags but does not carry: past Pr = 0.4 Pc the basic panel-zone strength takes (1.4 - Pr/Pc) (Eq. J10-10), past 0.75 Pc the deformation-modeled strength takes (1.9 - 1.2 Pr/Pc) (Eq. J10-12), Pc = Py = Fy Ag. A W14-class column at 45% of axial yield loses 5% of its panel zone; at 83% it is losing 1.2% per additional percent of axial. Below the thresholds it matches the sibling exactly. A design aid, not a connection design.
Formula and source
Py = Fy Ag; ratio = Pr/Py; not modeled: ratio <= 0.40 -> Rn = 0.60 Fy dc tw (J10-9), else x (1.4 - ratio) (J10-10); modeled: ratio <= 0.75 -> Rn = 0.60 Fy dc tw [1 + 3 bcf tcf^2/(db dc tw)] (J10-11), else x (1.9 - 1.2 ratio) (J10-12); phiRn = 0.90 Rn.
The AISC 360-16 Section J10.6 panel-zone shear strength with column axial load, Eq. J10-10 and J10-12, by name.
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