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. These are the important Tips to make and find the steel cutting length.
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.
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.
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Bar Bending Schedule Basics Formula  Calculation of Reinforcement Shape, Cutting and Bending Lengths:
1. Hook Length:
The hook length is commonly provided for stirrups
Hook Length = 9D [D is Diameter of the Bar]
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)
2. Length of Straight Bar with Bends:
Total Length = Length of Straight Portion + 2(Hook Length)
3. 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 30^{o} to 60^{o}, but it is generally 45^{o} = l_{1} – l_{2} = l_{a}
Where,
Giving different values to 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
4. 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).
5. 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]
6. 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.
Overlap Length for compression members = 40D
Overlap Length for tension members = 50D
[D is the Diameter of the bar]
7. 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)
Triangular Stirrups:
Triangular Stirrups  Length of Stirrups = 3H + (2 x 10d)
Circular Stirrups:
Circular Stirrups  Length of Stirrups = (3.142 x Dia of Steel Ring) + (2 x 10d)
Diamond Stirrups:
Diamond Stirrups  Length of Stirrups = 4H + (2 x 10d)
Spiral Stirrups:
Spiral Stirrups  Length of Stirrups = Length of Spiral or Helix Bar = n x (C^{2} + P^{2})^0.5
where,
 n = No. of Pitches = n = H/p + 1
 C = 3.142 x d
 P = Pitch or Spacing between spirals
OTHER POSTS:
How to Find Cutting Length of Chair Bar in Footing
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Bar Bending Schedule for footings  Steel Estimation for footings
Bar Bending Schedule (BBS)  BBS Step by Step Preparation  Excel Sheet
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.
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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