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How to calculate BBS of Rectangular Footing with few Easy Step

How to make BBS on Rectangular Footing.

Calculate BBS of Footing Just 4 Step

Given Data From Footing Drawing

Footing Size  = 1 m x 1.2 m
Spacing of Bar  = 100 mm C/c
Footing Cover  = 50 mm
Bar Use in Footing = 12 mm

 

Footing cross section

Step- 1
Cutting Length of Y-Axis

Cutting Length = Length (Y-Axis) – (2x Cover) + (2x Height)  – 4 Cover (For  “L” Upside)  – Bend

Cutting Length = {1200 – (2 x 50) }+ (2 x 300) – (4 x 50) – (2 x 2 x 12)

Cutting Length = 1100 + 600 – 200 – 48

Cutting Length = 1100 + 600 – 248

Cutting Length = 1700 – 248

Cutting Length = 1452

Cutting Length = 1.45 m

 

Step- 2
Cutting Length of X-Axis

Cutting Length = Length (X-Axis) – (2x Cover) + (2x Height)  – 4 Cover (For  “L” Upside)  – Bend

Cutting Length = {1000-(2 x 50)} + (2 x 300) – (4 x 50) – (2 x 2 x 12)

Cutting Length = 900 + 600 – 200 – 48

Cutting Length = 900 + 600 – 248

Cutting Length = 1500 – 248

Cutting Length= 1252

Cutting Length= 1.25 m

 

Step- 3
Numbers of bar Along With X Axis ( Length – 1.45 m)

Number of Bar X-Axis = [ Length – (2x Cover) ] /Spacing + 1

Number of Bar X-Axis = [ 1000 – (2x 50) ] /100 + 1

Number of Bar X-Axis = ( 900 / 100 ) + 1

Number of Bar X-Axis = 10 Nos

We Need 10 Number of bar for length of 1.45 m.

 

Step- 4
Numbers of bar Along With Y Axis ( Length – 1.25 m)

Number of Bar X-Axis = [ Length – (2x Cover) ] /Spacing + 1

Number of Bar X-Axis = [ 1200 – (2x 50) ] /100 + 1

Number of Bar X-Axis = ( 1100 / 100 ) + 1

Number of Bar X-Axis = 12 Nos

We Need 12 Number of bar for length of 1.25 m.

 

Download Excel Sheet For Footing BBS Calculation.

BBS in Excel

 For better know about BBS Please Watch this Video.

 

Rectangular ring cutting length Circular ring cutting length

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