ACI 318-19 RC Slab Design — Two-Way & One-Way Slab Calculator

Quick presets

Load a typical configuration, then fine-tune

Project information

Appears on the printed calculation sheet

Project

Project number

Checked by

Date

Revision

Material properties

ACI 318-19 Ch. 19 & 20

Concrete strength, f'cpsi

Rebar yield strength, fypsi

Unit weight, wclb/ft³

λ (NW = 1.0)—

Steel modulus, Espsi

Ec (Cl. 19.2.2)psi

3,834,254psi

33·wc^1.5·√f'cfr (Cl. 19.2.3)psi

474.34psi

7.5·λ·√f'cn = Es/Ec—

7.563

β1 (Cl. 22.2.2.4.3)—

0.850

Slab geometry

Dimension details — drives the drawings

Slab thickness, hin.

Clear cover, ccin.

Effective depth, dX (L1 bars)in.

6.313in.

Effective depth, dY (L2 bars)in.

6.938in.

Span L1 (long)ft

Span L2 (short)ft

Column c1 (L1 dir.)in.

Column c2 (L2 dir.)in.

Clear span Ln1 = L1 − c1ft

18.50ft

Clear span Ln2 = L2 − c2ft

14.50ft

Edge beam present?

Reinforcement — both directions

Bar size and spacing for L1 and L2 bars; L2 bars sit in the outer layer

Spacing mode

Bar size — L1 direction

Bar size — L2 direction

Spacing — L1 directionin.

10.75in.

Spacing — L2 directionin.

12.00in.

Max spacing allowed — L1 / L2in.

12.00in.

db — L1 / L2in.

0.625in.

Ab — L1 barin²

0.307in²

Ab — L2 barin²

0.307in²

As provided per strip — L1in²

0.343in²

As provided per strip — L2in²

0.307in²

Loading

ACI 5.3.1 load combination

Superimposed dead load, SDLpsf

Live load, LLpsf

Self weight, sw = wc·hpsf

100.00psf

Total dead load, DLpsf

120.00psf

wu = 1.2DL + 1.6LLpsf

224.00psf

ws = DL + LLpsf

170.00psf

Sustained load fraction DL/ws—

0.706

Column & punching shear parameters

ACI Cl. 22.6, 8.4

Column type

α_s (Cl. 22.6.5.3)—

40.00

Unbalanced moment, Mulb-ft

ϕ flexure—

ϕ shear—

Deflection parameters

ACI Cl. 24.2

ξ time-dependent factor

ρ' compression reinforcement—

Support condition