Let us calculate the size of the footing for the following given data.
Eg:
Calculate the length & width of the footing for the building load of 5000KN. The building has 12nos. of footings as shown below. The bearing capacity of soil is 11,297 kg/ m.²
If you want to know, how to calculate the bearing capacity of any construction site, Go through the article 👇
👀. How to calculate the bearing capacity of soil at the site?
Given data:
Building load = 5000KN.
Bearing capacity of soil = 11,297kg./ m.²
No. of footings = 12 nos.
Calculation:
Area of all the footings
= [ building load ÷ bearing capacity of soil]
First, we have to convert the building load into kg. to have the same unit.
As you know, 1KN = 101.971kg.
Therefore building loads in kg.
= [5000 × 101.971]
= 509,855 kg.
Area of all the footings
= [ 509,855kg. ÷ 11,297kg/./ m.²]
= 45.132 m.²
So, the area of one footing
= [area of all footings ÷ no. of footing]
= [ 45.132 m.² ÷ 12]
= 3.76 m.²
Size of the footing:
1. The size of the square footing:
Area = [length × breadth]
= [ L × B]
In square footings, L = B.
So,
3.76 m.² = L²
L = √ 3.76 = 1.94m.
The size of the square footing will be 1.94m. × 1.94m.
2. The size of the rectangular footing:
Suppose, we need the breadth of the footing as 1.5m.
Area = [ L × B]
3.76 m.² = [ L × 1.5m.]
L = [3.76 m.² ÷ 1.5m.]
= 2.51m.
The size of the rectangular footing will be 2.51m. × 1.5m.
Go through the article 👇
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Note: This method holds good for the smaller residential buildings having equally distributed loads.
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Thank you for going through these calculation steps❤. Have a good day 😄.
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