Concrete Anchor Pryout in Shear (ACI 318-19 17.7.3)
The shear mode that governs SHORT stiff anchors AWAY from an edge - exactly where the edge-breakout check exits. The anchor pries a breakout body out of the surface behind it, so Vcp = kcp x Ncb rides on the tension-breakout strength, with kcp jumping 1.0 -> 2.0 at hef = 2.5 in; phiVcp = 0.70 Vcp. A 6-in cast-in anchor away from edges checks 31.2 kip design pryout. A shear design takes the LEAST of steel, edge breakout, and pryout.
Formula and source
Vcp = kcp x Ncp with Ncp = Ncb (the 17.6.2 tension-breakout strength); kcp = 1.0 for hef < 2.5 in, 2.0 for hef >= 2.5 in; phiVcp = 0.70 Vcp (Condition B).
The ACI 318-19 Section 17.7.3 concrete pryout strength of an anchor in shear (17.7.3.1a), by name.
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