Bar Bending Schedule for RCC Beam In Full Detail
Bar Bending Schedule for RCC Beam
Bar bending schedule (BBS) used for give the detail of information of reinforcement that how much cut length of steel, type of bend and bend length should be provided.
Bar bending schedule is the abbreviation of BBS which describes the number of steels, length, size, type, mark and location this process gives detail about type, size, number, location and length of steel is called bar bending schedule for preparing the bbs the details of reinforcement are shown in structural drawing of reinforcement.
Bar Bending Schedule (BBS) used by
Bar bending schedule is used by different kind of peoples and authorities on construction site which is given below:

Quantity surveyor

Steel fixer

Contractor

Project manager

Inspectors

Clerks of construction
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In construction site all estimation and costing operation is the responsibilities of quantity surveyor. The bar bending schedule gives the details to quantity surveyor for finding out the number of steel its type, size and shape. Contractor are using bar bending schedule (BBS) for ordering the steel bar for proceeding the construction. Steel fixer using bar bending schedule (BBS) for doing their work or installing the bar in column, beam or slab according to the bar bending schedule (BBS) that how much cut length or bending of bar will be needed and which size of steel should be use. The inspector and clerks of construction refers to the BBS to make are that the reinforcement work in the field is in proper with the design reinforcement as per drawing.
Steps for Preparation of a BBS
Most of details and information in bar bending schedule is present in structural drawing of steel which is shape, dia, length and spacing of bars. The steps for preparing the bar bending schedule are as follow:

Number of bars

Shape of bar

Dia of bar

Spacing between reinforcement

Cut length of steel

Bar mark reference

Length of steel
For preparing a bar bending schedule we must take an example which is given below
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Example of RCC Beam Calculation
Let a beam having 6 m length, 200 mm wide 400 mm depth. The bar at the top is provided having dia of 2 – 12 and 3 – 16 dia of bar at the bottom. The dia of stirrup is 8mm and spacing is 150 mm. clear cover in reinforcement is 25 mm.
Solution
To preparing bar bending schedule in RCC beam the following factors should be find that is given below
Length OF

Top bar

Bottom bar

Stirrup
Numbers OF

Steel

Stirrup
Weight OF

Top bar

Bottom bar

Stirrup
Steps for BBS of RCC Beam
Generally, there are mainly three steps to make the bar bending schedule for RCC bream
Step 1
The equation of length of top bar
Length of top bar = clear span + 2 (width of wall) + 2 (bend up bar) – 2(concrete cover)
& the equation for Bend up bar length:
Bend up Bar = 6d
Where d is the dia of bar
The dia of bar, “d” is 12mm as given in example of RCC Beam
Bend up bar length = 6(12)
Bend up bar length = 72mm
Bend up bar length is 72 mm assumed as 72 mm
Putting the values in this formula
Length of top bar = 6000 + 2(200) +2(72) – 2(25)
Length of top bar = 6502 mm ≈ 6.50 m
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Step 2
Now the second step is to find bottom bar
Length of bottom bar = clear span + 2 (width of wall) + 2 (bend up bar) – 2 (concrete cover).
The formula for Bend up bar length
Bend up bar length = 6d
where d is the dia of bar
Ben up bar length = 6(16)
Ben up bar length is 100 mm
Putting the values in the equation of length of top
Length of bottom bar = 6000 + 2(200) +2(80) – 2(25)
Length of bottom bar = 6550 mm ≈ 6.55 m
Step 3
Now finding the length of stirrup.
There are four sides in rectangle stirrup the opposite sides are equal in rectangle so we find the two sides A and B.
Calculation of side A
Length of side A = (200 – 2(25)) x 2
Length of side A = 300 mm
Calculation of side B
Length of side B = (400 – 2(25)) x 2
Length of side B = 700 mm
Hook length as per IS 2502 – table II
Hook length for stirrup is 9d where d is dia of bar
Hook length = 9 x 8 = 72
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How to calculate the cutting length of reinforcement bars in circular R.C.C slab
Length of stirrup = side A + side B + 2 (hook length)
Length of stirrup = 300 + 700 + 2 x 72
Length of stirrup = 1144 mm ≈ 1.14 m
BBS for RCC beam
S. NO 
Bar Mark 
Bar dia 
No of bars 
Length (m) 
unit weight(m/kg) 
weight of steel (Kg) 
1  B1  12  2  6.5  0.888  11.54 
2  B2  16  3  6.55  1.57  30.85 
3  S  8  41  1.14  0.395  18.46 
Total Weight of Reinforced Concrete Beam  60.85 
Note:

B1 = Top bar of beam

B2 = Bottom bar of beam

S = stirrup of beam

To find the weight of steel multiply number of bars with length and unit weight of steel (weight of steel = No of bars x Length x unit weight of steel)
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