How to calculate steel quantity from drawing for Beam?

Hello, guys here we will learn how to calculate steel quantity in the beam which is given in the drawing.

Suppose we are given the length of beam 10′(Feet) and Depth of beam 18″(Inches). The arrangement of steel bars in the beam is given below.

Let the hook be 9D. Where D is the diameter of the steel bars.

Spacing between the stirrups be 6.3″ at the corners and 12″ at the middles.

Clear Cover be 1″.

Bent up bars are making angle of 45 degree with horizontal.

Hence, this is the drawing at the site. It is given by the designer, not by the surveyor. Surveyors have to calculate the quantity of steel from the given drawing below.

Now, let us move ahead and see “how to calculate steel quantity from drawing” for beam step by step.

How to calculate steel quantity from drawing for Beam?

Step-1 Calculate Quantity for Straight Steel Bars

How to calculate steel quantity from drawing for Beam?

Step-2 Calculate Quantity for Bent Up Steel Bars

How to calculate steel quantity from drawing for Beam?

After Calculating length of bent up bars, calculate the Total Weight.

How to calculate steel quantity from drawing for Beam?

Now, We can Calculate the weight of steel bars by the following formula. Remember the length of steel bars should be in feet and the diameter should be in mm to use this formula.

Here, we calculate the total length of stirrups, and then we can calculate the weight by using the following formula given below.

Total Length of Stirrups = (Length of one stirrups * No. of stirrups)

Hence the total quantity of steel bars required for different grade of steel bars is given below.

For #6 grade we need 48 Kg Steel.

For #3 grade we need 11 Kg Steel.

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Hence, in this way we can calculate the quantity of steel bars in a beam Step by Step.

I hope this article on “How to calculate steel quantity from drawing for Beam?” remains helpful for you.

Happy Learning – Civil Concept

Contributed by,

Civil Engineer – Ranjeet Sahani

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