This code establishes standard procedures for the cutting, bending, and fixing of steel reinforcement bars used in concrete. It specifies dimensions for hooks, bends, and ties, along with permissible tolerances and best practices for site execution to ensure structural integrity and correct detailing.
Provides guidelines for proper methods of bending, cutting, and placing of steel reinforcement bars in concrete.
Quick Reference Values
standard hook allowance9d
standard 90 degree bend allowance5.5d
minimum straight length beyond hook curve4d (or minimum 50 mm)
tolerance on specified length±25 mm
tolerance on bent dimension under 1m+0 mm, -10 mm
binding wire minimum diameter0.9 mm
Key Formulas
Total length of bar with two standard U-hooks = L + 18d
Length of bar with standard 90-degree bend = L + 5.5d
Practical Notes
Always use the correct mandrel (former) size to prevent micro-cracking at bends, especially for HYSD and TMT bars.
Bars must generally be bent cold; hot bending is only permitted with structural engineer approval and controlled temperatures to avoid altering the steel's metallurgy.
Ensure standard hook lengths (9d) are strictly maintained at site to guarantee proper anchorage in concrete.