Bar Bending Schedule for Reinforced Concrete Beam
Bar bending schedule provides the RCC Calculation for reinforced concrete beam. It provides details of the reinforcement cutting length, type of bends & bend length. We will take 1 example for reinforcement QTY calculations for a Concrete Beam.
Example of the Beam Reinforcement Calculation.
Consider a beam of clear length of 4-m, 300-mm wide by 450-mm depth. It consists of 2-12 diameter bars at top, & 2-16 diameter & 1 – 12 diameter bars at the bottom. Diameter of stirrup is 8-mm spaced at 180-mm center to center. Clear cover to reinforcement provided is 40-mm.
Now we will calculate the length of the reinforcement based on shapes of the reinforcement required for reinforced concrete beam in above example. We will start with bottom reinforcement, B-1. Bar shape of B-1 is as shown below.
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Bar Bending Schedule for RCC Slab With Complete Details
Length of B-1 = Clear distance between walls + two x width of walls – two x bar cover + two x bend length Bend length = Six x 16 = 96 consider as 100-mm Bend length is calculated as 6 x diameter of the bar for reinforcement conforming to IS: 1786 -1961 Length of B-1 = 4000 + two x 230 – two x 40 + 2 x100 = 4580-mm Length of bar B-2 is calculated based on the shape of this bar. This bar bends up near the support as shown below.
Length of bar B-2: A + B + C = 4000 + two x 230 – two x 40 + (1.414xH – H) H = 450 – two x 40 – two x 12 – two x 12/2 = 334-mm B-2 = 4000 + 2 x 230 – two x 40 + (1.414 x 334 – 334) = 4518.3 = 4520-mm Length of the Bar T-1 = 4000 + two x 230 – two x 40 = 4380-mm Length of Stirrups S-1:
Length a = 450 – two x 40 – 8 = 362-mm Length b = 300 – two x 40 – 8 = 212-mm Therefore, length of one stirrup S1 = two x ( 212 + 362 + 90 ) = 1328-mm Where 90-mm is the minimum hook length as per IS 2502 – Table – II.Learn More
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Bar Bending Schedule for R.C.C Beam
No. |
Bar Mark |
Bar dia (mm) |
No. of bars |
Length (mm) |
Weight of bars (kg) |
Bar Shape |
1 |
B1 |
16 |
2 |
4580 |
14.5 |
|
2 |
B2 |
12 |
1 |
4520 |
4.02 |
|
3 |
T1 |
12 |
2 |
4380 |
7.80 |
|
4 |
S1 |
8 |
24 |
1330 |
12.6 |
|
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( Civil Engineering Technology )
