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The steel quantity in column footing can be calculated very easily. Before calculating the steel read carefully given footing drawing and note all the important points like.
Footing. (Length, Width, Thickness).
The diameter of Footing reinforcement.
A grade of reinforcement is going to use.
The spacing of the reinforcement (c/c).
Hook’s length (If needed).
Concrete Covers of the Footing. (Top and Bottom).
Let’s solve this example to understand well.
Suppose we have a Column Footing having a Length 2 m, Width 2 m and having a Thickness 0.250 m. The main bars is 12 mm @ 150 c/c and Distribution bar is also 12 mm @ 150 c/c. The footing clear cover is 50 mm from the top and 75 mm from the bottom. Calculate the number of steel is going to use in this Column Footing.
Steel Quantity in Column Footing Formula
Length of the Footing = 2 m.
The width of the Footing = 2 m.
Thickness = 0.250 m
Main bar = 12 mm @ 150 c/c
Distribution bar = 12 mm @ 150 c/c
Clear cover = 50 mm from Top and Sides and 75 mm from Bottom.
The first step is to calculate the number of bars which are going to use in the footing.
In the second step, we will calculate the cutting length of the bars and at the last, we calculate the weight of the reinforcement bars.