Bar Bending Shape Codes – Bar Bending Schedule Formula

What Is Bar Bending Schedule?

Bar bending schedule or BBS is a list of reinforcement bars in tabular form which provides bar mark, bar shape, bar dia, dimension of bending of the bar, length of bar, weight of bar etc. There are different kinds of bar shapes are used in reinforcement. The reinforcement design depends on the load calculation. From bbs reinforcement of different bar sizes are calculated, then bars are cut and bent appropriately at site. In this article, I will discuss different bar bending shape codes used to prepare bar bending schedule.

Why Calculating of Bar Schedule?

A requirement of steel in the project.

Labor cost.

Project monitoring.

Material reconciliation.

Contol of Wastage in steel etc.

Bar Bending Shape Codes:

For small projects, we generally use thumb rules for reinforcement calculation. But for large scale project bar bending schedule is prepared by using bar bending shape codes to avoid unnecessary wastages. It also makes easier to cut the steel bar for the reinforcement as per the design.

Bar Bending Shape Codes As Per BS 8666:2005

Different bar bending shaped codes are listed below.

Where L = Total length of the bar

Minimum Scheduling Radius, Diameter And Bend Allowance:

Nominal size of bar, d, mm	Minimum radius for scheduling, r	Minimum diameter of bending former	General (min 5d straight), including links where bend ≥ 150° mm	Links where bend ≤ 150° (min 10d straight) mm
6	12	24	110*	110*
8	16	32	115*	115*
10	20	40	120*	130
12	24	48	125*	160
16	32	64	130	210
20	70	140	190	290
25	87	175	240	365
32	112	224	305	465
40	140	280	380	580
50	175	350	475	725

6 mm, 8mm and 50 mm are non preferred sizes available to special order.

Happy Learning.