ACI 31822.6.5

Two-way shear (punching) — ACI 318

Concrete punching shear strength v_c is the smaller of three expressions, accounting for column aspect ratio (β) and column type (interior/edge/corner — α_s factor).

Formulas

v_c (smallest of 3)
v_c = min{ 0.33λ√f'_c , 0.17(1 + 2/β)λ√f'_c , 0.083(α_s d/b_o + 2)λ√f'_c }

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Editorial paraphrase for fast lookup — the official ACI 318 text is authoritative. For exact wording, refer to the published code.