Axial-flexural capacity of short column

The calculation below provides the bending capacity (PM) of a rectangular short column

Input:

tip: You can drag the verts to different spots. Changing 'nb' will reset it.

Output:

    Definitions
    • ϕc = Resistance factor for concrete
    • ϕs = Resistance factor for reinforcing steel
    • fc = Specified concrete strength
    • fy = Specified reinforcing steel yield strength
    • b = Effective width of cross section
    • h = Overall depth of cross section
    • nb = Quantity of reinforcing bars
    Properties
    • Gross Area: 144 in²
    • Steel Area: 4.65 in²
    • Concrete Area: 139.4 in²
    • Reinforcing Ratio: 0.0323
    • Ix: 1728 in⁴
    • Iy: 1728 in⁴
    • Pmin: -480 kip
    • Pmax: 237 kip
    User Notes:

P-M Diagram

-100-50.0050.0100-2000200400600Moment (kip-ft)Axial (kip)x: 0 y: 599x: -25 y: 524x: -37 y: 486x: -56 y: 420x: -68 y: 366x: -77 y: 315x: -82 y: 287x: -86 y: 260x: -90 y: 225x: -95 y: 185x: -97 y: 141x: -95 y: 103x: -90 y: 64x: -82 y: -1x: -74 y: -29x: -56 y: -84x: -42 y: -125x: -29 y: -165x: -16 y: -203x: 0 y: -237x: 16 y: -203x: 29 y: -165x: 42 y: -125x: 56 y: -84x: 74 y: -29x: 82 y: -1x: 90 y: 64x: 95 y: 103x: 97 y: 141x: 95 y: 185x: 90 y: 225x: 86 y: 260x: 82 y: 287x: 77 y: 315x: 68 y: 366x: 56 y: 420x: 37 y: 486x: 25 y: 524x: 0 y: 599x: -97 y: 480x: 97 y: 480P-M CurvePrmax Limit