Bar Bending Schedule Basic Formulas  BBS Formula  What is BBS  Hook Length  Cut Length of Straight Bar  Cut Length of Bend up Bar or Crank Bar  Length of Extra Bars  Hook’s Length Formula for Stirrups  Lap Length:
In this Article today we will talk about the Bar Bending Schedule Basic Formulas  BBS Formula  Hook Length  Cut Length of Straight Bar  Cut Length of Bend up Bar or Crank Bar  Length of Extra Bars  Hook’s Length Formula for Stirrups  Lap Length  Bar Bending Schedule format. These are the important Tips to make and find the steel cutting length and Prepare bar bending schedule, must watch the tutorial video about Basic BBS formulas in the bottom of this post.
What is Bar Bending Schedule?
In Civil Engineering Bar Bending Schedule is the important part of Estimation chart. In the Bar Bending schedule provides the reinforcement (steel) calculation for reinforcement of concrete column , beam and slab cutting length and also use to find the types of bends of length which we provide in steel structures. Bar Bending Schedule format
BBS is used in finding cutting length of steel and total weight of steel per unit area. and we can make the bar bending schedule in Ms office Excel software.
It is important to learn the basics before dealing with BBS or Bar Bending Schedule format
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Bar Bending Schedule Basics Formula  Calculation of Reinforcement Shape, Cutting and Bending Lengths:
Bar Bending Schedule Formulas:
1. Commonly Used Diameter of Reinforcement Bars (in mm):
Diameter of Reinforcement Bars (in mm)
6mm, 8mm, 10mm, 12mm, 16mm, 20mm, 25mm, 28mm, 32mm, 36mm, 40mm
Diameter of Reinforcement Bars (in inches)
#3 (3/8″) , #4 (1/2″), #5(5/8″) , #6(3/4″) , #7(7/8″) , #8(1″) , #9(9/8″) , #10(10/8″)
2. Standard Length of Reinforcement Bars:
The standard length of reinforcement bars is 12m or 40 ft Bar Bending Schedule format
3. Weight of Bar Per meter Length (in kg/m):
The weight per length of the reinforcement bars is expressed as,
Weight per meter = D²/ 162
For example; if the diameter of the reinforcement bar is 6mm, then,
Weight per meter = 6²/ 162
= 0.222 kg/m how to prepare bar bending schedule
(Note: you should keep the value of D in mm and the answer comes in m.)
4. Weight of Reinforcement Bar per 12 m Length (kg/ bar)
The weight per bar can be expressed as,
Weight / bar = Weight of Bar per m x Standard Length of Bar
= 0.225 x 12
= 2.7 kg/bar how to prepare bar bending schedule
5. Weight of Bar Per feet Length (in kg/ft):
The weight per bar can be expressed as,
Weight per feet = D² / 533
For example; if the diameter of the reinforcement bar is #4 i.e. ½ in or 12.70mm, then,
Weight per feet = 12.70²/ 533 = 0.302 kg/ft (since, D must be in mm)
Also, how to prepare bar bending schedule
Weight per feet = D²/ 52.896
For example; if the diameter of the reinforcement bar is #4, then,
Weight/ Length = 4²/ 52.896 = 0.302 kg/ ft (since, D must be in #No.)
6. Weight of Reinforcement Bar per 40 ft Length (kg/ bar)
The weight of reinforcement bar per bar can be expressed as,
Weight / Bar = (D²/ 533 ) x standard length of bar
For example; if the diameter of the reinforcement bar is 12.70mm (#4), then,
Weight/ bar = (12.70²/ 533) * 40
= 12.10 kg/ bar
so the weight of 40ft bar is 12.10 kg/bar
7. Cutting Length of Main Reinforcement Bar with Hook:
Length of Hook = 9d, where d is the diameter
Length of Main Bar = L + 9d + 9d
8. Cutting Length of Main Bar with Bend:
Length of bend = 10d – 6d
Length of Main Bar = L + 12d + 12d
9. Concrete Cover:
Cover basically includes a clear cover and effective cover.
Clear cover for
footing is taken as 75mm,
for column 25mm to 50mm,
for beam 25 to 50mm and
for slab 25mm
10. Hook Length for Stirrups:
The hook length is commonly provided for stirrups
Hook Length = 9D [D is Diameter of the Bar]
Hook Length  Bar Bending Schedule
Total Length of stirrup = Total length of Bar + 2 x Hook Length (Two hooks)
Total Length = L+2(9D)
Therefore Total length = L+18D (D is Diameter of bar)
But in some cases, we will consider 10D
IS code recommends hook length should not be less than; Minimum Hook Length = 75mm
11. Length of Straight Bar with Bends:
Total Length = Length of Straight Portion + 2(Hook Length)
Length of Straight Bar Formula  Bar Bending Schedule
12. Additional Length for Bent up or Crank Bar with Bends:
The additional length (la) that is introduced in the simple, straight endtoend length of a reinforcement bar due to being bent up at (Theta) say 30o to 60o,
but it is generally 45o = l1 – l2 = la
Where,
Fig: Hooks and bends in Reinforcement
Giving different values to angle 30 degree, 45 degree and 60 degree
respectively), we get different values of la, as tabulated below:
Figure 2 presents the procedure to arrive at the length of hooks and the total length of a given steel reinforcement.
For 45 Deg  Crank length is provided in Slab Shear stress is maximum at supports in Slab. So, to resist this stress we usually crank the bars at the ends of supports in slab.
Crank bar is bent up at an angle of 45 degree with the length of 0.42D
D = Depth of SlabTop CoverBottom cover
13. Length for Extra Bars:
Now a days Extra bar is also provided under every crank bar. To keep crank bar in position. (Refer above image for clear idea).
14. Bend Hook Length Formula for Column:
Bend Length is usually provided in columns at ends to tie the columns to the footings.
Bend Length = 16D [D is Diameter of the Bar]
15. Overlap Length / Lap Length in Reinforcement (Bar Bending Schedule):
Suppose the length of building is 20 m. The standard length of Rebar is 12m. We have to join two Rebars for the total length of building. In order to Join the two bars (overlap). Overlap length is adopted.
Neck Column to Footing Overlapping = 40d – 50d
Column to Column or Beam Overlapping = 50d
Development Length for Dowel Bars = 16d
General overlapping on Completion of 12m bar = 50d
or we can say that,
Overlap Length for compression members = 40D
Overlap Length for tension members = 50D
[D is the Diameter of the bar]
16. Hook’s Length Formula for Stirrups:
Hook’s Length for Stirrups are mostly equal to 10d, Where d is dia of bar.
Rectangular Stirrups:
Rectangular Stirrups  Length of Stirrups = 2A + 2B + (2 x 10d)
Cutting Length of Rectangular Stirrups  Bar Bending Schedule
Triangular Stirrups:
Triangular Stirrups  Length of Stirrups = 3H + (2 x 10d)
Cutting Length of Triangular Stirrups  Bar Bending Schedule
Circular Stirrups:
Circular Stirrups  Length of Stirrups = (3.142 x Dia of Steel Ring) + (2 x 10d)
Cutting Length of Circular Stirrups  Bar Bending Schedule
Diamond Stirrups:
Diamond Stirrups  Length of Stirrups = 4H + (2 x 10d)
Cutting Length of Diamond Stirrups  Bar Bending Schedule
Spiral Stirrups:
Spiral Stirrups  Length of Stirrups = Length of Spiral or Helix Bar = n x (C2 + P2)^0.5
where,
 n = No. of Pitches = n = H/p + 1
 C = 3.142 x d
 P = Pitch or Spacing between spirals
17. Bend Deduction
As per Pakistan or some other countries, there is no need for bend deduction but as per Indian standards we should consider bend deduction as per the following procedure;
For 45 deg bend = 1d
For 90 deg bend = 2d
For 135 deg bend = 3d
For 180 deg bend = 4d
18. Rolling Margin of Reinforcement Steel Bar Formula:
Cut reinforcement bar into 3 pieces, each length 1 meter Weight Each piece differently i.e. 10 mm Día Bar, Reinforcement calculation excel
1st one weight 0.617,
2nd one weight 0.62,
3rd one weight 0.625
Now Calculate the rolling margin of Reinforcement bar
19. Development Length for Reinforcement Bars:
20. Bar Bending Schedule Basic Formulas  Video Tutorial
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Design Example of Dog Legged Staircase
FAQs:
 Weight per meter = D²/ 162 = kg/m, where D is in 'mm'
 Weight per feet = D² / 533 = kg/ft where D is in 'mm'
 Weight per feet = D²/ 52.896 = kg/ft where D is in # (Nos)
Conclusion:
Full article on Bar Bending Schedule Basic Formulas  BBS Formula Hook Length  Cut Length of Straight Bar  Cut Length of Bend up Bar or Crank Bar  Length of Extra Bars  Hook’s Length Formula for Stirrups  Lap Length. Thank you for the full reading of this article in “The Civil Engineering” platform in English. If you find this post helpful, then help others by sharing it on social media. If you have any question regarding article please tell me in comments.
35 Comments
Please make Video for BBS of Well foundation
Excellent information regarding bar bending schedule and steel calculation
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Excellent information regarding bbs, and steel calculation
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Hi Sir you are very nice note provide all the civil engineer students and other construction realated people
Thank you sir ji
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Sir, Is there any courses you are offering for civil engineer,let me know
Not now but I will Launch one course regarding Advanced Quantity Surveying Soon
We are waiting sir. Thanks for the good work you are doing. Please I want to be like you sir.
How shall I contact you by phone call
what you need you can comment here i will reply you
Good and nice information.
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I can’t download excel sheet
It will be upload soon, Just keep in touch please
Engi Waseem Raja I apriciate you but is it bar bending is only civil engineer field? What about cotm engineer?
Its not only related to Civil Engineering Its related to cost and Management too if you are working on building construction project
Well explained 👍👌
Can you send me a template of BBS in Exel format..?
I will upload soon, Thanks for the comments please visit more articles by clicking on “All Posts” tab of the Menu Bar
sir, I did not find any download link for a text file
This site is under maintenance i will upload later
Nice
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Great job.
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Sir i cant find any download link please upload it.
Szia, meg akartam tudni az arat.
please comment in english
Sir File Nahi mil raha hai.
just wait for few days i will upload soon
Ndewo, ach?r? m ?mara ?n?ah?a g?.
I dont understand yr language please tell me in english
Dia duit, theastaigh uaim do phraghas a fháil.
please tell me in english