Concrete Corbel / Bracket Design (ACI 318-19 16.5)
The primary tension steel of a concrete corbel or bracket by ACI 318-19 16.5: the mandatory 0.2 Vu horizontal tension, the greater of the flexure-plus-tension and shear-friction-plus-tension steel paths (which governs flips with the shear span), and the min-of-three shear cap. The corbel checks a bare shear-friction check misses.
Formula and source
Nuc = max(input, 0.2 Vu); Avf = Vu/(phi mu fy); Mu = Vu av + Nuc(h - d); Af = Mu/(phi fy 0.85 d); An = Nuc/(phi fy); Asc = max(Af + An, (2/3)Avf + An); phiVn = phi min(0.2 f'c, 480 + 0.08 f'c, 1600) b d (phi = 0.75).
The ACI 318-19 Section 16.5 brackets-and-corbels design provisions, by name.
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