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Bar bending schedule provides the reinforcement calculation for reinforced concrete beam. It provides details of reinforcement cutting length, type of bends and bend length.

We will take one example for reinforcement quantity calculations for a concrete beam.

Example of RCC Beam Reinforcement Calculation:

Consider a beam of clear length of 4m, 300mm wide by 450mm depth. It consists of 2-12 diameter bars at top, and 2-16 diameter and 1 – 12 diameter bars at the bottom. Diameter of stirrup is 8mm spaced at 180mm center to center. Clear cover to reinforcement provided is 40mm.

RCC Beam Reinforcement Details

Fig: RCC Beam Reinforcement Details

rcc-beam-cross-section

Fig: RCC Beam Cross-Section

Now we will calculate the length of reinforcement based on shapes of reinforcement required for reinforced concrete beam in above example.

We will start with bottom reinforcement, B1.

Bar shape of B1 is as shown below:

RCC Beam Bar Bending Shape

Length of B1 = clear distance between walls + 2 x width of walls – 2 x bar cover + 2 x bend length

Bend length = 6 x 16 = 96 consider as 100mm

Bend length is calculated as 6 x diameter of bar for reinforcement conforming to IS: 1786-1961

Length of B1 = 4000 + 2 x 230 – 2 x 40 + 2 x100 = 4580mm

Length of bar B2 is calculated based on shape of this bar. This bar bends up near the support as shown below:

RCC Beam Bar Bending Shape

Length of bar B2: A + B + C = 4000 + 2 x 230 – 2 x 40 + (1.414xH – H)

H = 450 – 2 x 40 – 2 x 12 – 2 x 12/2 = 334mm

B2 = 4000 + 2 x 230 – 2 x 40 + (1.414×334 – 334) = 4518.3 = 4520mm

Length of Bar T1 = 4000 + 2 x 230 -2 x 40 = 4380mm

Length of Stirrups S1:

RCC Beam Stirrups Length Calculation

Stirrups are spaced at 180mm center to center. Stirrups are provided between walls or support for a beam.

No. of stirrups required for given beam = No. of Stirrups

Length a = 450 – 2 x40 – 8 = 362mm

Length b = 300 – 2 x 40 – 8 = 212mm

Therefore length of 1 stirrup S1 = 2 x (212 + 362 + 90) = 1328 mm

Where 90mm is the minimum hook length as per IS 2502 – Table – II.

Bar Bending Schedule for RCC 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

Bar Bending Shape of RCC Beam

2

B2

12

1

4520

4.02

Bar Bending Shape of RCC Beam

3

T1

12

2

4380

7.80

Bar Bending Shape of RCC Beam

4

S1

8

24

1330

12.6

Bar Bending Shape of RCC Beam