Bar Bending is the process of cutting, bending, and fixing the reinforcement bars as per drawing. But what about the bar bending schedule? Why do we need it?
Take the below diagram of reinforcement details of a beam that lists all the details in comprehensive mode. It is the end result of the structural design.
The responsibility of the structural engineer has been completed by suggesting the right reinforcement bars to the structure. But at the site, many people need to understand the reinforcement details in a simple manner for their responsibilities.
Bar Bending Schedule is a definitive list of reinforcement bars for any structural element that includes a mark, shape, size, location, length, and bending details of the reinforcement. It is often referred to as BBS.
Tabular view representation of each reinforcement bar used in any structural element is known as BBS.
Before preparing, make sure to follow the below guidelines
As said earlier, bbs is a definitive list of reinforcement requirements.
Each structural element will be prepared separately either for each floor or for the entire building. We have discussed the bar bending schedule for different structural elements such as
Any BBS has only five steps of calculation such as
As simple as that.
Cutting Length of Bottom Bar = Lclear – (2x concrete cover) + (2×500)
= 3000 – (2×40) + (2×500) = 3920 mm
Cutting Length of top bar = Lclear – (2x concrete cover) = 3000 – (2×40) = 2920 mm
Step 2 – Number of Stirrups
Number of Stirrups = (Length of Beam / Spacing) + 1 = (3000/200) + 1 = 16 numbers
Step 3 – Cutting Length of Stirrups
Cutting Length of stirrup = Perimeter of stirrup + (3 x 90° bend) + (2 x hook length)
= 2 ( 520+220 ) + (3 x 2d) + (2x1d) = 1480+(3x2x10)+(2×10) = 1560 mm
Bar Shape | Dia of Bar | Cutting Length | Number of Bar | Length of Bar (mm) | ||||
8 | 10 | 12 | 16 | 20 | ||||
10 | 3920 | 2 | – | 7840 | – | – | – | |
10 | 2920 | 2 | – | 5840 | – | – | – | |
8 | 1560 | 16 | 24960 | – | – | – | – | |
Total Length (m) | 24.96 | 13.68 | – | – | – | |||
Weight Per Metre (Kg/m) | 0.4 | 0.62 | 0.89 | 1.58 | 2.47 | |||
Total Weight in Kg | 9.984 | 8.482 | – | – | – |
Happy Learning 🙂
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Useful for the site engineers who work on reinforcement job.
Thanks, all in one place reinforcement schedule
Good knowledge of civil planet.
I want to know cutting length of box culverts
BBS study
Good knowledge of bar bending schedule for civil engineering and I like this