Column Interaction Diagram (P-M Curve)

Generate the interaction diagram (P-M curve) for a concrete column according to ACI 318 and check if your axial load and bending moment are safe.

Column Parameters

Width b (mm)

Depth h (mm)

Clear Cover (mm)

Concrete f'c (MPa)

Steel fy (MPa)

Load Demands (Pu, Mu)

Factored Axial Pu (kN) (kN)

Factored Moment Mu (kN-m) (kN-m)

Positive (+) for Compression, Negative (-) for Tension

Corner Reinforcement

Corner Bar Ø (mm)

Quantity (4)

X-Face Bar Ø (mm)

Qty per Face

Y-Face Bar Ø (mm)

Qty per Face

Stirrup Ø (mm)

What is an Interaction Diagram?

An interaction diagram (or P-M curve) represents the combined axial load and bending moment capacity of a reinforced concrete column. Any combination of load and moment that falls inside the curve is considered safe according to ACI 318 standards.

Design Status

Pu: 1200 | Mu: 150

UNSAFE

Reinforcement Ratio (ρ)

1.68 % (2011 mm²)