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Question
Trapezoidal footing length = 2m , B=1.7m D=0.5m and d-
0.15m. Can anybody help and calculate quantity of concrete 
by explaining all formulas involved.
 Question Submitted By :: Civil-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
i think the dimension what ever is given in the question is not full , because the formula is =
V = [L X B X d] + h / 3 [ A1 + A2 + ROUTE UNDER A1 A2 ]

where ,
l = length , b = breadth , d = bottom depth , h = D - d ,
A1 = bottom area , A2= top area .

so , how can we calculate ,[ A2 ] top area without dimension .
 
Is This Answer Correct ?    251 Yes 34 No
Kumar Biswajit Sinha
 
Answer
# 2
h/3(area of bottom + area of top+ under root area of
bottom * area of top)
 
Is This Answer Correct ?    77 Yes 23 No
Rakesh Suthar
 
 
 
Answer
# 3
volume of trapezoidal footing = H/3{a1+a2+square root a1.a2}
here a1 = area in bottom of footing
a2 = area in top of footing
H = height of footing
if there is any doubt then call me on 09907027855
 
Is This Answer Correct ?    47 Yes 16 No
Santosh
 
Answer
# 4
Concrete quantity = H/3 [ a2 + b2 + square root of a2 x b2]

H = height of the trapezoidal footing

a2 = Area of the bottom of footing

b2 = Area of the top of footing
 
Is This Answer Correct ?    36 Yes 11 No
Sathy
 
Answer
# 5
Volume of Trapezoidal footing= h/2(a+b)*l
where,
h= depth of footing
a= top width of footing
b= bottom with of footing
l= length of footing
In Case of Frustrum of Pyramid
V= h/3(A1+A2+Square root of A1*A2)
Where,
A1= Area of top section (a*b)
A2= Area of Bottom Section (A*B)
 
Is This Answer Correct ?    21 Yes 8 No
S.kumar
 
Answer
# 6
h/6(a1+a2+4a m),
a1= area of top
a2= area of bottam
am=average of both area
h= height at mid (like:-D)
 
Is This Answer Correct ?    20 Yes 8 No
Abid
 
Answer
# 7
a1+b1+root of a1*b1*h/3 footing size 7*7m 30cm*30cm
a1=49 b1=0.12m h=.3m
49+.12+root of 49*.012 *.3/3
49.12 + 2.425*.10
51.545*.10= 5.155cum
 
Is This Answer Correct ?    7 Yes 6 No
V.parthiban
 
Answer
# 8
V2= D/6(a1+a2+4Am)where Am=(a1+a2)/2
And D=D-d(total Depth-rectangular Depth)
a1=area Of Footing Bottom
a2=area Of Footting Top

V1=(LxBxd)
V=V1+V2
 
Is This Answer Correct ?    1 Yes 0 No
Kuldeep Yadav
 
Answer
# 9
from trapezod forula of area a=h/2*(b1+b2)
a=2/2*(1.7+0.5)=2.2m2
from volume formula v=a*d=2.2*0.15=0.33m3
 
Is This Answer Correct ?    1 Yes 0 No
Abiy
 
Answer
# 10
h/3(a1*a2)+root of a1^2*a2^2
a1-area of bottom
a2-area of top
h-over all height
 
Is This Answer Correct ?    1 Yes 1 No
Ananth
 

 
 
 
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