Panel-Zone Doubler-Plate Thickness (AISC 360 J10.6)
The how-thick that steel-panel-zone-shear leaves open: when the panel-zone check fails, the doubler plate is sized by two limits. Strength t = (Vu - phiRn_bare) / (0.90 x 0.60 Fy dc); stability (Eq. J10-12) t >= (dz + wz)/90 for a plate not plug-welded to the web. On a stocky column with a small shortfall the stability minimum governs (a strength-only calc would spec a plate too thin to be stable); on a deep beam the strength governs. Reports the governing thickness rounded up to the next 1/16-in plate. A detailing aid, not a stamped connection design.
Formula and source
phiRn_bare = 0.90 x 0.60 Fy dc tw; t_strength = max(0, Vu - phiRn_bare) / (0.90 x 0.60 Fy dc); t_stability = (dz + wz)/90 (Eq. J10-12); t_required = max(t_strength, t_stability) when a doubler is needed.
The AISC 360-16 Section J10.6 panel-zone doubler-plate provisions, Eq. J10-9 and Eq. J10-12, by name.
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