Construction Cost Estimating

      

How to create the design of the column footing

In this construction video tutorial, the eminent engineer Sami Ullah, provides some useful tips to design the square column footing efficiently.

The following steps are used to create the design :-

1: Area of column footing
2: Soil Reaction
3: Factor moment
4: Required depth of footing (d)

The design calculation is based on the following data :-

Applied load on the column = p = 2000 kN
Size of column = 400mm x 400mm
Soil bearing strength = S.B.C = 150 KN/m2
M20 grade of concrete will be applied in this column

Grade of Steel = fe = 415
Compressive strength of concrete = fy = 20 N/mm2
Solution of first step: Area of footing
Area of footing = 10% of P+P / S.B.C
The applied load is raised at 10% of P

Here (P) denotes applied load and S.B.C denotes Soil bearing capacity
SOLUTION:

Area of footing = 10% of P+P / S.B.C = 0.1 x 2200 + 2200 / 150 = 14.55 m2
Now, find out footing one side = √A = √14.55 = 3.28 m = 4 meter (approx).
second step: Soil Reaction
The following formula is applicable
qu = Pu / A
Here pu denotes the factor load of the column and A denotes the area of footing

The value of pu = 1.5 x P so = 1.5 x 2200 = 3300 KN
Therefore, qu = Pu / A = 3300 / 14.55 = 225.10 KN/m2

To get more information, watch the following video.

Video Source: Sami Ullah

How to create the design of the column footing