As we know "BBS" is the word plays a significant role in any construction of high rise building.For any RCC structures BBS is important and it should be prepare in proper manners for different structure of building like COLUMN, BEAM, SLAB,FOOTING and others.

In this article we will study the different formulae for cutting length of stirrups for Column and Beams.Like Rectangular stirrups,Square stirrups,Circular stirrups, Helical stirrups,Triangle stirrups,Diamond stirrups

Earlier we also know Hook length = 9d or 10d.

also we Bend deduction for Different angles:

1. For 45 Degree Bend = 1D

2. For 90 Degree Bend = 2D

3. For 135 Degree Bed = 3D

4. For 180 Degree Bend = 4D

* Cutting length of Rectangular  Stirrups  

2 x ( A+B ) + 2 Nos of Hook length - 3 x 2D - 2 x 3D

Where, A= length of Rectangular Stirrups      

How to calculate stirrups cutting length ?
Rectangular stirrups

            B= Width Of Rectangular Stirrups

            2D= Bend Deduction for 90 Degree

            3D= Bend Deduction For 135 Degree 

* Cutting length of Square stirrups 

4 x A + 2 Nos Hook length - 3 x 2D - 2 x 3D

Where, A= length of  Square Stirrups                          

How to calculate stirrups cutting length ?
Square stirrups

            2D= Bend Deduction for 90 Degree

            3D= Bend Deduction For 135 Degree 


* Cutting length of Circular stirrups

How to calculate stirrups cutting length ?
circular stirrups


2 x Circumference of ring + 2 Nos of Hook - 2 x 3D

Where,  3D= Bend Deduction For 135 Degree


* Cutting Length of Helical stirrups

To find the helical outer ring we have to find the circumference of the inner ring.

* Length of inner space ring = circumference of inner ring , we know the Diameter of the pile so its easy to find the diameter of inner ring and radius.

* Diameter of outer spiral ring = Diameter of pile - Clear cover

* Length of one spiral ring = circumference of inner ring.

Circular ad Helical are almost same except the hook provided for the number of rings. in Helical we have to calculate the required length of stirrups for entire length of column.pleas  read the BBS for pile post fr details.

* Cutting length of Triangle stirrups   

 ( 2 X H ) + A + ( 2 x 10D ) - ( 4 x 3D )

Where, A= length of   Stirrups     

How to calculate stirrups cutting length ?
triangle stirrups

            3D= Bend Deduction For 135 Degree 

            H = square root of ( b2 ) + ( a/2 )2 same it is a rectangular column we are taking.

* Cutting length of Diamond stirrups

( 4 x H ) + ( 2 x Nos of Hook ) - ( 3 x 2D ) - ( 2 x 3D)

Where,   H =  square root of ( b/2 )2 + ( a/2 )2

How to calculate stirrups cutting length ?
Diamond stirrups