T-Beam Effective Flange Width (ACI 318-19 6.3.2)
The slab width acting with a T-beam web: overhang = smallest of 8 hf, sw/2, ln/8 (interior; both sides) or 6 hf, sw/2, ln/12 (edge; one side). 12 in web, 4 in slab, ln 240, sw 48 -> be 60 in interior (sw/2 governs), 32 in edge (ln/12 governs). A design aid; the engineer of record governs.
Formula and source
interior: overhang = min(8 hf, sw/2, ln/8), be = bw + 2 overhang; edge: overhang = min(6 hf, sw/2, ln/12), be = bw + overhang.
The ACI 318-19 6.3.2 effective flange width of a T-beam, by name.
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