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How to Calculate Cutting Length of Circular Stirrups | RCC Column – Afroz Civil

How to Calculate Cutting Length for Circular Stirrups | Afroz Civil

How to Calculate Cutting Length for Circular Stirrups (Step-by-Step)

In RCC construction, accurate cutting length of circular stirrups is essential for proper reinforcement detailing, cost control, and smooth site execution. This guide explains the cutting length calculation for circular column stirrups with a clear and practical example.

Given Data

  • Diameter of circular column (D) = 900 mm
  • Clear cover = 40 mm
  • Diameter of stirrup bar (d) = 10 mm
  • Shape = Circular stirrup
  • Hooks = 2 hooks (standard)

Bend Criteria (As per Site Practice)

  • 45° bend = 1d
  • 90° bend = 2d
  • 135° bend = 3d
  • Standard hook length = 10d

Where d = diameter of stirrup bar.

Step 1: Effective Diameter of Stirrup (D1)

D1 = D − 2(Clear Cover) − 2(Half stirrup diameter)

D1 = 900 − 2(40) − 2(10/2)

D1 = 810 mm

Step 2: Perimeter of Circular Stirrup

Perimeter = π × D1

= 3.141 × 810 = 2545.21 mm

Step 3: Hook Length

Total hook length = 2 × 10d = 200 mm

Step 4: Deduction for Bends

Bend deduction = 2 × (2d) = 40 mm

Final Cutting Length Formula

Cutting Length = πD1 + 2(10d) − 2(2d)

= 2545.21 + 200 − 40

= 2704.21 mm (2.704 m)

Excel Sheet Download

📥 Download Circular Stirrup Cutting Length Excel Sheet
👉 Click here to download

Why This Calculation Is Important

  • Accurate bar cutting
  • Reduced material wastage
  • Faster site execution
  • Correct billing & estimation
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