Trapezoidal footings are sloped footings. They are designed and constructed with great care to see that the top slope of 45 degrees is maintained from all sides.
Trapezoidal Volume Calculation Formula
The below formula has been used for calculating the volume of the trapezoidal footing.
V = H/3 (A1+A2+(√A1 x A2)
A1 = Area of Lower Portion
A2 = Area of Upper Portion
H = Height of trapezoidal portion
Trapezoidal Footing Volume – Example Calculation
Let us see an example.
Refer below the Diagram. Now we are going to calculate the volume of the trapezoidal footing.
Volume = H/3 (A1+A2+(√A1 x A2)
A1 = L*B
A1 = 2 x 1.5 = 3 Sqm
A2 = 0.5 x 0.3 = 0.15 Sqm
H = 0.15m
Now Volume = 0.15/3 x (3+0.15+(√3 x 0.15)
= 0.05 x (3.15+0.67)
= 0.19 Cum
Volume (V) = 0.19 Cum