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ACI 318-19/25
Combinations
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For single-span design checks with known forces, use the
beam calculator
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Continuous beam analysis
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2-span equal: 20 ft, pin-pin-pin, rectangular 12×24
3-span unequal: 18/24/18 ft, T-beam 14×28
Code edition
ACI 318-19
ACI 318-25
Section geometry
Beam type
Rectangular
T-beam
L-beam
b (in)
h (in)
Cover (in)
hf (in)
bf (in)
Reinforcement
Bar size
#4
#5
#6
#7
#8
#9
#10
#11
No. of bars
Layers
1
2
3
Materials
f'c (psi)
3000
4000
5000
6000
8000
10000
fy (ksi)
40
60
80
λ
1.0 (normal weight)
0.85 (sand-lightweight)
0.75 (all-lightweight)
Stirrups
Stirrups provided
Stirrup size
#3
#4
#5
Legs
2
3
4
6
Spacing (in)
Span definition
Number of spans
2
3
4
5
Span 1
Length (ft)
wD (kip/ft)
wL (kip/ft)
Point load / torsion
PD (kip)
PL (kip)
a (ft from left)
Tu (kip-ft)
Span 2
Length (ft)
wD (kip/ft)
wL (kip/ft)
Point load / torsion
PD (kip)
PL (kip)
a (ft from left)
Tu (kip-ft)
Span 3
Length (ft)
wD (kip/ft)
wL (kip/ft)
Point load / torsion
PD (kip)
PL (kip)
a (ft from left)
Tu (kip-ft)
Span 4
Length (ft)
wD (kip/ft)
wL (kip/ft)
Point load / torsion
PD (kip)
PL (kip)
a (ft from left)
Tu (kip-ft)
Span 5
Length (ft)
wD (kip/ft)
wL (kip/ft)
Point load / torsion
PD (kip)
PL (kip)
a (ft from left)
Tu (kip-ft)
Torsion type
Equilibrium
Compatibility
Support conditions
Left end
Pinned
Fixed
Right end
Pinned
Fixed
Interior supports are continuous (pinned).
Cantilevers (optional)
Left cantilever
Length (ft)
wD (kip/ft)
wL (kip/ft)
Right cantilever
Length (ft)
wD (kip/ft)
wL (kip/ft)
Options
Moment redistribution (ACI 6.6.5)
Redistribution (%)
Engine caps per section based on epsilon_t (max 20%).
Deflection parameters
ρ' (compression ratio)
Sustained live fraction (0 to 1)
Duration
3 months
6 months
12 months
5 years+
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