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Checks
Hinge zone length 2h (beam) / ℓ₀ (col)—
Max hoop spacing s_max,hinge—
Provided s vs s_max—
First hoop ≤ 50 mm from face—
Outside hinge: s_out limit—
Lap-splice excl. zone—
Min cross-section dim. (b)—
Code basis
Beam SMF (ACI 18.6.4 / NSCP): Hinge zone = 2h from each face. s ≤ min(d/4, 6·d_bL, 150 mm). First hoop ≤ 50 mm. Outside hinge: s ≤ d/2. Column SMF (ACI 18.7.5): ℓ₀ = max(h, ℓn/6, 450 mm). s_max,hinge = min(b/4, 6·d_bL, s₀) where s₀ = 100 + (350 − h_x)/3, 100 ≤ s₀ ≤ 150 mm. Outside ℓ₀: s ≤ min(6·d_bL, 150 mm). Lap splices only in middle half of column. b ≥ 300 mm; aspect ≤ 0.4.