Reinforced Concrete Beam Design

This calculation provides the moment and shear capacity of a rectangular beam.

Input:

in
in
in
ksi
ksi
in
deg
concrete beam

Output:

    Definitions
    • ϕc = Resistance factor for concrete
    • ϕs = Resistance factor for reinforcing steel
    • fc = Specified concrete strength (psi)
    • fy = Specified reinforcing steel yield strength (ksi)
    • As = Area of reinforcing steel (in2)
    • α1 = Stress modification factor for equivalent stress block
    • β = Cracked concrete shear factor
    • d = Depth to primary reinforcing (in)
    • b = Effective width of cross section (in)
    • Av = Area of transverse (shear) reinforcing (in2)
    • s = Spacing of rebar (in)
    • λ = Concrete density modification factor; 1.0 for normal density concrete
    • dv = Shear depth, normally taken as 0.9d (in)
    • θ = Assumed shear crack inclination (deg)
    Determine the flexural capacity
    Mr = 82.1k-ft (111.3 kNm)
    • in
    • in²
    • in²
    • in
    • kip-ft
    Determine the shear capacity
    Vr = 60.3k (268.1 kN)
    • in²
    • in²
    • in
    • in
    • kip
    • kip
    • kip
    • kip
    User Notes: