Concrete Anchor Side-Face Blowout (ACI 318-19 17.6.4)
The third headed-anchor tension failure mode, the one deep anchors near an edge actually hit: Nsb = 160 x c_a1 x sqrt(Abrg) x lambda_a x sqrt(f'c), cut by (1 + c_a2/c_a1)/4 at a corner, phiNsb = 0.70 x Nsb. Governs when hef > 2.5 c_a1 - past that, deepening stops helping and the edge distance is the only knob. The v612 example anchor at a 3 in edge checks 17.2 kip design, and only 10.0 kip in a corner with a 4 in second edge. A design check, not a stamped anchor design.
Formula and source
Nsb = 160 x c_a1 x sqrt(Abrg) x lambda_a x sqrt(f'c); corner modification (1 + c_a2/c_a1)/4 where c_a2 < 3 c_a1; phiNsb = 0.70 x Nsb; governs when hef > 2.5 c_a1.
The ACI 318-19 Section 17.6.4 side-face blowout of a headed anchor in tension, by name.
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