Bi-axial Column Design

Biaxial Column Design Calculator

Column Width (b) [mm]

Column Depth (D) [mm]

Concrete Grade (fck) [MPa]

Steel Grade (fy) [MPa]

Factored Axial Load (Pu) [kN]

Assumed Steel % (p)

Factored Moment X (Mux) [kNm]

Factored Moment Y (Muy) [kNm]

Uniaxial Capacity X (Mux1) [kNm]

Uniaxial Capacity Y (Muy1) [kNm]

Note: Mux1 and Muy1 must be determined from SP-16 design charts based on corresponding values of Pu, p/fck, and d'/D ratios.

Calculation Output Ledger

Gross Sectional Area (Ag):

Area of Structural Steel (Asc):

Net Area of Concrete (Ac):

Pure Ultimate Axial Capacity (Puz):

Utilization Ratio (Pu / Puz):

Biaxial Exponent (αn):

Interaction Value Requirement:
(Mux/Mux1)^αn + (Muy/Muy1)^αn ≤ 1.0