Bar Bending Schedule of Neck Column | BBS Steel Estimation

byQA QC Civil Engineering -
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 In this Article today we will talk about the Bar Bending Schedule of Neck Column | Estimation of Steel Reinforcement | BBS Formulas | BBS of Column | Steel Quantity Calculation | Bar Cutting Schedule

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Bar Bending Schedule of Neck Column | BBS of Neck Column

Bar Bending Schedule for Neck Column | BBS of Neck Column | Estimation of Steel reinforcement in Neck Column:

Bar Bending schedule plays a very important role in estimating quantities of steel reinforcement required for the building. Before getting into Bar bending schedule for Neck Column, I refer you to learn the how to Calculate Bar Bending Schedule (basics) and how to adopt Concrete Cover for Steel reinforcement.

What is Neck column | Definition:

The part of the column which is present in sub structure is called neck column. (Column in substructure) Well, the reason for this dividing column into two parts  is to make ease in understanding the Bar Bending schedule clearly.

QUANTITY OF REINFORCEMENT (STEEL) REQUIRED FOR NECK COLUMN OR Bar Bending Schedule for Neck Column:

In this post, I am finding out the Estimation of Steel reinforcement in Neck Column/ Bar Bending Schedule for Neck column. For this, I considered a plan as shown below.

  

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Steps to be followed while finding out the total wt. of steel required for constructing  Neck columns: –

Neck column reinforcement  calculation is divided into two parts Main bars and stirrups.

Part-I:- Main Bars

  1. Check the Length of  Main bars
  2. Add the overlap length and bend length to the neck column.
  3. Adopt Dia of Main Bars
  4. Calculate the total length of main bar.
  5. Find the total wt of Main bars.

Part-II:- Stirrups

  1. Deduce the concrete cover from all sides of tie/stirrups and find out the length of stirrup.
  2. Adopt Dia of Stirrup.
  3. Calculate the length of stirrup including hook.
  4. Then Find out the total no. of stirrups.
  5. Find the total length of stirrups
  6. Lastly,  Calculate the total wt. of stirrups.

Length, Dia and No. of Bars are adopted and designed by the structural engineer by executing the load analysis.

To make it clear I included almost all types of columns. Well C1, C3, C4, C6,  C9 (Square Columns) are similar and C2, C8 (T-Column) C5 is Circular Column, C7 is L Type column.

 

Assume for calculation:
 
Dia of Main Bars = 16mm, 
Dia of Stirrups= 8mm,
Spacing between stirrups = 0.1m
Length of Main bar excluding extra bars is  2.25m , 
Diameter of Circular column C5 = 0.6
No. of Main Bars = 4 in Square column, 
No. of Main Bars = 8 in Circular & L Type Column
No. of Main Bars = 10 in T Type Column
 
Column Details:
 
C1, C3,C4, C6, C9 is Square Column (0.4mx 0.4m)
C5 Circular Column (Radius 0.3m)
C2, C8 T-Type Column C7 L-Type Column 

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CALCULATION FOR THE QUANTITY OF NECK COLUMNS (MAIN BARS):

C1, C3,C4, C6, C9 is Square Column (0.4mx 0.4m):

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C5 Circular Column:
 

Well, L Type Column (C7) has same No. of Main Bars as circular column C5, total wt of steel required for L type columns are 41.78 Kgs.


C2, C8 T-Type Column:

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CALCULATION FOR THE QUANTITY OF NECK COLUMNS (STIRRUPS): 

C1, C3,C4, C6, C9 is Square Column (0.4mx 0.4m):

First of all deduct the concrete cover from all the sides of column for finding out the length of stirrup. As per the condition deduct the concrete cover of  0.05 from all sides of stirrups in square column.

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C5 Circular Column (Diameter 0.6m):

First of all deduct the concrete cover from all the sides of column for finding out the length of stirrup. As per the condition deduct the concrete cover of  0.1 from all sides of stirrups in square column. Bar Cutting Schedule
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C2, C8 T-Type Column:

C7 L-Type column:

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ABSTRACT FOR FINDING OUT THE TOTAL QUANTITY OF STEEL REINFORCEMENT REQUIRED FOR NECK COLUMN FOR THE ABOVE GIVEN PLAN:

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OTHER POSTS:

Conclusion:

Full article on Bar Bending Schedule of Neck Column | Estimation of Steel Reinforcement | BBS Formulas | BBS of Column | Steel Quantity Calculation | Bar Cutting Schedule. Thank you for the full reading of this article in "QA/QC Civil Engineering" platform in English. If you find this post helpful, then help others by sharing it on social media. If any formula of BBS is missing from this article please tell me in comments.
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Hi I am a Civil Engineer by profession but I’ve specialized and taken the journey in the field of Quality Engineering, QA/QC Civil Engineering, Bar Bending Schedule, Quantity Surveying, Construction, Concrete Works, Estimating & Costing and AutoCAD Civil 3D.

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