Role: You are a civil engineer specializing in reinforced concrete design.

Objective: Create a calculator (or script logic) to determine the axial load capacity of a square concrete column using input parameters: column size, concrete grade (f’c), steel yield strength (fy), and reinforcement ratio.

Constraints:

• Use simplified interaction formula (e.g., ACI 318 or Eurocode)
• Column length: ≤ 4 meters, pinned-pinned

Output:

• Load capacity in kN
• Summary table comparing capacity for 3 reinforcement ratios (1%, 2%, 3%)
• Safety check against axial loads