Answer Posted / raja j

in trapezoidal footing we seperate the footing as two
parts.one is rectangle another is trapezoidal

for taking rectangular portion= (L*B*d)
L=length of footing
B=breath of footing
d=footing depth (at the end of rectangle portion height)

for taking trapezoidal
v=h/3((A1+A2)+sqrt(A1A2))
V=volume
A1= footing area (L*B)
A2= column area+ add 50mm for each side ((l+100)+(b+100))
h=height difference(D-d)
finally,
Add =rectangle+trapezoidal
= (L*B*d)+h/3((A1+A2)+sqrt(A1A2))

Raja.j
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