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Steel Weight Calculator For Footing

Calculations for Steel Calculator for Column Footing

Let’s understand with the help of an example, how to use the above Steel Calculator for Column Footing

Assumptions For Example

• The calculation procedure is for a single reinforcing net.
• There are 2 types of bars in a footing: Main Bar & Distribution Bar.
• Main Bar Diameter = 12 mm
• Spacing Between Main Bars (C/C distance) = 100 mm
• Distribution Bar Diameter = 12 mm
• Spacing Between Distribution Bars (C/C distance) = 100 mm
• Length of Footing (Longer Span) = 2 m
• Width of Footing (Shorter Span) = 2 m
• Thickness of Footing = 0.25 m
• Clear Cover from tops & sides = 50 mm
• Clear Cover from bottom= 75 mm
• We are using Steel grade of fe500.

Calculation Procedure

• Step 1: Calculation of Number of main & distribution Bar
No’s of Main bar = [(Total distance – clear cover) / Spacing] + 1
=[(2 – 0.05) / 0.1 ] + 1
= 21
No’s of Distribution bar = [(Total distance – clear cover) / Spacing] + 1
=[(2 – 0.05) / 0.1 ] + 1
= 21

• Step 2: Calculation of cutting length of main & distribution bar
Cutting Length of main bar = [Total length – 2(Half diameter of the bar + Clear cover) + 2(Thickness of the slab –Bottom and Top clear cover – Half diameter of the bar)]
=[2 – 2(0.006 + 0.05) +2(0.25 – 0.075 – 0.05 – 0.006)]
=2.12 m
Cutting Length of Distribution bar = [Total length – 2(Half diameter of the bar + Clear cover) + 2(Thickness of the slab –Bottom and Top clear cover – Diameter of the bar – Half diameter of the bar)]
=[2 – 2(0.006 + 0.05) +2(0.25 – 0.075 – 0.05 – 0.012 – 0.06)]
=2.10 m

• Step 3: Total Length Calculation
Total Length of Main Bar = 21 x 2.12
= 44.64 m
Total Length of Distribution Bar = 21 x 2.10
= 44.14 m

• Step 4: Calculation of Steel Weight
Weight of the bar as per their length and diameter by following the Formula: –
Unit weight formula for kg per metre =(D2/163) × L kg/m
Unit weight for feet per metre = (D2/ 533) × L kg/ft
L is the required length of Steel bar of Diameter D
Weight of Main Bar = (122/163) x 44.65
= 39.45 Kg
Weight of Distribution Bar = (122/163) x 44.15
= 39 Kg

Final Result

Total Steel Weight =  39.45 + 39  =78.45 Kg

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