Axial capacity of short column

This calculation provides the axial capacity of a rectangular short column

Input:

psi
ksi
in
in

Output:

  1. Definitions
    • ϕc = Resistance factor for concrete
    • ϕs = Resistance factor for reinforcing steel
    • fc = Specified concrete strength (psi)
    • fy = Specified reinforcing steel yield strength (ksi)
    • b = Effective width of cross section (in)
    • h = Overall depth of cross section (in)
    • nb = Quantity of reinforcing bars
  2. Axial capacity
    • Pr = 0.80 Pro = 0.80 [ α1 ϕc fc (Ag - As) + ϕs As fy]
    • α1 = 0.85 - 0.0015*fc = 0.8 (fc in MPa)
    • Ag = b d = (12) (30) = 360 in2
    • As = nb Ab = (6) (0.775) = 4.65 in2
    • Pr = 0.80 [ (0.8) (0.65) (5) (360 - 4.65) + (0.85) (4.65) (60)]
    • Pr = 928.85 kip

Notes: