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Preparation Of Bar Bending Schedule

Bar Bending Schedule:

Bar bending schedule or BBS is a list of reinforcement bars in tabular form which provides the following important details:

1. Bar mark, which indicates the right position of the bar in a structure.

2. The diameter of the bar.

3. The shape of the bar.

4. The dimension of bending of the bar.

5. The number of same bar types.

6. The length of all bars.

7. Total length.

8. Weight .

9. Total weight.

From BBS we can know the reinforcement of different bar sizes and bars are cut and bent appropriately at the job site. It also ensures proper checking and completion of estimates in a short time. The dimension of bends should be so given in the BBS that minimum calculation is required for the making of bars and furtherly setting the machine and stops.

Preparation OF Bar Bending Schedule:

The shapes and proportions of hooks and bends in the reinforcement bars are shown in Fig. 1– these are standard proportions that are conformed to:

(a) Length of one hook = (4d ) + [(4d+ d )] – where, (4d+ d ) = 9d. (Curved portion)

(b) The additional length (la) that is introduced in the simple, straight end-to-end length of a reinforcement bar due to bending at θ° say 30o to 60o, generally, 45o is considered)

la= l1 – l2

Fig 1: Hooks and bends in Reinforcement

Let θ = 30°, 45°, 60° respectively

The length of hooks and the total length of a given steel reinforcement is achieved by the following method.

Fig 2: Typical Bar Bending Schedule

Also Read –Reinforcement Details In Beams And Slabs
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Comments ( 6 )

  1. Isn’t there some heavy machines as bar benders available in market for this?

  2. Very good presentation Sir. What is the cutting length in BBS ? How rod cutting length is calculated in site ? What is the K value for U hook & L bend ? Please explain these.

  3. I’m very interested for civil engineering

  4. I like you post

  5. It is too nice info for civil engineers

  6. I love what you guys are doing. Keep it up

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