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sci.rebar-development-length-ACI318 Calculator
Calculates rebar development length from ACI 318 provisions based on bar diameter, concrete strength, cover, and confinement. No. 8 bar (25 mm) in 30 MPa concrete requires l_d ≈ 730 mm — bar development length scales as d_b²/√f'c; confinement (stirrups or cover > 2.5d_b) reduces it by 0.75× factor.
Inputs
Db Mm
Distance across a circle through its centre. Always confirm units match the rest of the calculation.
Fc Mpa
Reference formula or conversion factor shown for context.
Fy Mpa
Stress at which permanent deformation begins. Design loads should stay below this — apply a safety factor of 1.5–3×.
Cover Mm
Reference formula or conversion factor shown for context.
Psi T
A multiplier applied in the calculation.
Results
development length ld (mm)
The computed linear length.
development length ld (bar diameters)
The computed diameter -- twice the radius.
simplified ACI 318-19 formula
The specific form or variant of the result.
top bar factor applied
A dimensionless multiplier applied in the calculation.
ACI 318-19 §25.5
Reference formula or conversion factor shown for context.
cover check
A pass/fail verification against the applicable code, standard, or threshold.