Beam Design Calculator
Design reinforced concrete beams with flexural, shear, and deflection calculations per ACI 318.
Beam Parameters
Required Reinforcement
5-#7
As = 3.00 in² (1.103% ratio)
Flexure
OK
Shear
Stirrups
Deflection
OK
Design Forces
wu
5.000 k/ft
Mu
250.00 k-ft
Vu
50.00 kips
Capacity
phiMn
261.31 k-ft
Mu = 250.00 k-ft
phiVc
24.55 kips
Vu = 50.00 kips
As Required
2.85 in²
Min: 0.86 in²
Effective Depth
21.56"
d = h - cover - stirrup - db/2
Shear Reinforcement
#3 stirrups @ 8.4" o.c.
Development Length
3.32 ft
Design Notes
Assumptions
- Simply supported beam
- Uniformly distributed load
- Rectangular section (not T-beam)
- Normal weight concrete
ACI 318 Requirements
- Load factors: 1.2D + 1.6L
- Strength reduction factor phi = 0.9 (flexure)
- Minimum steel: 3sqrt(fc)/fy or 200/fy
- Deflection limit: L/240 for floors