Spiral reinforcement length — review draft

Calculate the Table IX C spiral schedule approximation from internal diameter, bar size, pitch and complete or fractional turns.

Inputs

• Internal diameter D (mm)
• Nominal bar diameter d (mm)
• Pitch P — maximum D / 5 (mm)
• Complete and fractional turns N (turns)

Assumptions and limitations

Draft IS 2502:1963 Table IX C schedule arithmetic, printed page 14. Requires pitch P ≤ internal diameter D / 5; this limit is not a structural spacing check. N includes complete and fractional turns and is supplied directly. The geometric winding comparison excludes ends and is not a cutting length. No end-turn arrangement, stock rounding, material suitability, anchorage, confinement or seismic/structural adequacy is checked. The plan view is not a fabrication drawing.

Source

Calculation source

Interactive calculators require JavaScript and the calculation service.