Mostly for small house construction, the reinforcement will be calculated just based on the thumb rule. The excess procured steel will be used for other works.

But for a large-scale project, the tedious BBS schedule will be prepared to avoid the unnecessary wastages.

Bar bending shape codes are the cutting length formula used to avoid unnecessary cut wastes on reinforcement.

Advantages of using BBS codes in BBS Schedule

• To minimise the wastage
• To cut the steel bar easily based on the shape code
• To procure the accurate quantity of material
Contents of the Article

## Standard Bar Bending Shape Codes

 Bar Bending Shape Cutting Length of Bar L = A L = A+B-0.5r-d L = A+B+C-r-2d L = A+B+C-r-2d L = 2(A+B)-2.5r-5d+Hook L = A-3.2D+2Hook L = A+B+2Hook L = A+B+C+D-2r+Hook L = A+B+C L = Cπ(d-A) A-Spacing C-Nos of turns L = A L = A+C L = A+B+C L = A+B+C+D+E L = A+C+D L = A+B+C+D-0.5r-d L = A+B+C+D+E L = A+B+C+D-1.5r L = A+B+2C-2.5r L = 2A+2B-2.5r+2Hook L = A

### Notes:-

• The end or side covers for steel bar may be taken as 4cm to 5cm
• The bottom & top covers should be in the range of 1cm to 2cm.
• The covers for beam shall be taken as 2.5cm to 5cm.
• The length of one hook is 9 dia of the bar but not less than 75mm.

### Minimum Scheduling Radius, Diameter, and Bend Allowance

 Nominal Size of Bar (d) Minimum Radius for Scheduling (r) Minimum Diameter of Bending General (min 5d straight), including links where bend >150⁰ Links Bend <150⁰ 6mm 12 24 110 110 8mm 16 32 115 115 10mm 20 40 120 130 12mm 24 48 125 160 16mm 32 64 130 210 20mm 70 140 190 290 25mm 87 175 240 365 32mm 112 224 305 465 40mm 140 280 380 580 50mm 175 350 475 725

Bala is a Planning Engineer & he is the author and editor of Civil Planets.