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How to calculate the number of Bars in Footing
In this special civil engineering section, information is going to be provided about: in what way to make bar bending schedule of footing as well as calculate the number of bars in footing.
With regards to RCC slab, column and beam, it is necessary to offer reinforcement rods having various lengths as per drawings. Calculating the length of straight length through summing crank as well as hooks is called cutting length.
Bar bending schedule refers to a process of cutting as well as bending reinforcement bars to shapes. It consists of a comprehensive list, which signifies the position, mark, sort, size, number, length as well as bending details of each bar in a reinforcement drawing of a structure. The technique of listing is called scheduling.
A BBS (Bar Bending Schedule) presents the followings:
- Bar Mark
- Member identification
- Shape of bending
- Bar’s diameter
- Length of each bar
- Overall numbers of bars
- Overall length
- Weight
In BBS of footing, one is going to obtain the numbers of bars having distinct lengths as well as sizes in both y axis as well as x axis together with the cutting length to finish a footing.
The computation is carried out on the basis of the subsequent dimensions:
- The size of footing = 1 m x 1.2 m
- Bar spacing = 100 cm C/c
- Footing cover = 50 mm
The cutting length of x-axis is computed using the subsequent formula:
Cutting Length is equal to Length (X-Axis) – (2 x Cover) + (2 x Height) – 4 Cover – Bend
Cutting Length is equal to 1000 – (2 x 50) + (2 x 300) – (4 x 50) – 2 x 2 x 12;
4 x 50 is equal to Cover offered on the two sides in top as well as bottom
2 x 2 x 12 = With regards to 90 degree bend, 2d is subtracted and there are two bends in the two corners; diameter = 12 mm
Therefore, cutting length is equal to 900 + 600 – 200 – 48 = 1.25 m
Furthermore, same formula is going to be utilized to figure out the cutting length of y-axis, however the length is going to be different at this point.
Cutting length of Y-axis is equal to 1200 - (2 x 50) + (2 x 300) – (4 x 50) – 2 x 2 x 12 = 1.45 m
At this point, the numbers of bars are going to be computed using the subsequent formula:
Number of X-Axis = [Length – (2 x Cover)] / Spacing + 1
Number of X-Axis = [1200 – (2 x 50)] / 100 + 1 = (1100/100) + 1 = 12 Numbers (since the bars are going to be set towards Y axis, therefore length is considered as 1200).
Likewise, the numbers of bars toward Y-axis are going to be like this:
Number of Y-axis = [1000 – (2 x 50)] / 100 + 1 = (900/100) + 1 = 10 Numbers.
To get more clear ideas, go through the following exclusive construction video tutorial.
Lecturer: Tutorials Tips
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