One-Way Slab — ACI 318-25 Design

1 · Input data

Design check of a one-way slab — one 12 in. design strip of a solid nonprestressed cast-in-place slab — to ACI CODE-318-25 (procedure ENG-2026-10-026, Part A): the thickness against Table 7.3.1.1, cover and effective depth, both critical sections (maximum positive and maximum negative moment), the minimum flexural steel, the spacing and crack-control rules, the shrinkage and temperature reinforcement, one-way shear by row (c) of Table 22.5.5.1, the termination rules, and the deflection requirement. Every parameter below is required. Press Solve the slab check when the card is complete — if anything is missing or malformed the page opens a pop-up naming each parameter and computes nothing; an input that is well-formed but outside the procedure is refused with the clause that refuses it.

Slab geometry

h — overall slab thickness (in)

ℓ — span, center-to-center of supports (ft)

ℓ_n — clear span, face-to-face of supports (ft)

Support condition (Table 7.3.1.1)

Materials and exposure

f′_c — specified compressive strength of concrete (psi)

f_y — specified yield strength of reinforcement (psi)

Concrete exposure (Table 20.5.1.3.1, slabs row)

Factored forces, per foot of width

M_u — factored moment at the maximum positive-moment section (kip-ft/ft)

M_u — factored moment at the maximum negative-moment section (kip-ft/ft)

V_u — factored shear at the critical section d from the face (kip/ft)

N_u — factored axial force, compression positive (kip/ft, 0 for gravity)

Bottom (positive-moment) bars

Bottom bar size

Bottom bar spacing, on center (in)

Top (negative-moment) bars

Top bar size

Top bar spacing, on center (in)

Shrinkage and temperature bars

Shrinkage and temperature bar size (7.7.6, 24.4)

Shrinkage and temperature bar spacing, on center (in)

Concrete and aggregate

d_agg — nominal maximum aggregate size (in)

λ — concrete type (Table 19.2.1.1)

w_c — unit weight of the concrete (lb/ft³, 145 normalweight)

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2 · Solution

No solution yet — complete every input in the card above and press Solve the slab check. This card stays empty until a solution is computed, and it is emptied again the moment any input changes, so a displayed solution always belongs to the inputs on screen.