Cast-In Anchor Shear Concrete Breakout (ACI 318-19 17.7.2)
The check the tension tile names as separate: concrete breakout of a cast-in anchor loaded in SHEAR toward an edge. Vb = lesser of 7(le/da)^0.2 sqrt(da) and 9, x lambda sqrt(f'c) c_a1^1.5; corner, thin-member, and cracking factors; phiVcb = 0.70 Vcb. Capacity scales with the EDGE DISTANCE^1.5, not embedment - a 3/4-in anchor 6 in from the edge checks 5.9 kip design, and a corner with a 4-in second edge cuts it to 2.9 kip. Routinely governs base plates, ledgers, and equipment anchors near slab edges.
Formula and source
Vb = lesser of 7 (le/da)^0.2 sqrt(da) lambda_a sqrt(f'c) c_a1^1.5 and 9 lambda_a sqrt(f'c) c_a1^1.5; le = min(hef, 8 da); AVco = 4.5 c_a1^2; Vcb = (AVc/AVco) psi_edV psi_cV psi_hV Vb; phiVcb = 0.70 Vcb (Condition B).
The ACI 318-19 Section 17.7.2 concrete breakout strength in shear (17.7.2.2.1 basic strength, 17.7.2.4.1 edge factor, 17.7.2.5.1 cracking factor, 17.7.2.6.1 thin-member factor, Table 17.5.3 phi), by name.
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