# Calculate weight of steel bar | Quantity of steel bar in circular slab

After designing, we have to estimate the cost of structure to get started construction. So, for that, we need to calculate weight of steel bar or the number of steel bars.

When we have to design any structure then steel plays a very important role to resist load coming from naturally or artificially. So, while designing structure we should take care of the quantity of steel rod that should be provided in any structure.

I have taken the example of one question below which will make you clear about how to calculate the weight of steel bars in any structure. I have taken a slab of a certain diameter to calculate the weight of the steel bar. Let’s start to read how I have solved the problem with the calculation of the weight of the steel rod as well as the total length of steel rod required in the circular slab.

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The question is,

#### Q) Calculate the weight of steel bar and length of a steel bar of circular slab having diameter 6 feet whose rod center to center distance is 5 inches?

Solution;

Given, Diameter of Slab = 6 feet

Center to Center Spacing of steel rod (C/C) = 5 inch

Step-1

Convert all dimention into a single unit.
So,
Radius (R) = (Diameter/2) = 6/2 = 3 ft {Convering feet into meter}
= 0.914 meter (m)
C / C = 5″ = 0.127 meter (m)
Now,

Step-2,

Quantity of 1st Bars = √  R2– (C/C)2 { This is the formula of calculating length of steel in circular slab}
= √ (0.914)2-(0.127)2
= 0.905 m
Quantity of 2nd Bars = √ R2– (C/C)2
= √(0.954)2 – (0.254)2
= 0.877 m

Similarly,

Quantity of 3rd Bars = 0.830 m
Quantity of 4th Bars = 0.756 m
Therefore, Total length of steel Bars = 0th + 2( 1st + 2nd + 3rd +4th ) Bars
= 6+ 2 x ( 0.905 +0.877 + 0.830 + 0.756)
= 12.736 m
But, we put the next net on the previous net.
So, Total length of the rod will be = 2 * 12.736
= 25.472 m
Now,
If you want to calculate weight of steel then put the value in the formula, which is given below;

Weight(w) = d2*l/162.2

Where d is the diameter of rod in meter and, l is the total length in meter

So, W = (122 x 25.472)/162.2 { I have taken diameter of steel rod as 12 mm}
= 22.613 kg

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Hence Total weight of steel rod is 22.613 kg and the length of the steel rod is 25.472 meters.

So, friends, I hope this article on “Calculate weight of steel bar” remains helpful for you.

Thank you

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