How to measure the concrete work of the bridge girder
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This another useful presentation by renowned engineer S.L. Khan. In this video, Mr. Khan teaches you how to determine the concrete work (volume) for the I shaped girder of a bridge.
By applying the following formula, the volume of girder is calculated :-
Volume of girder = cross section area x length of the girder
Calculation is made on the basis of the following steps :-
1) Transform the section into simple geometry.
2) Work out section area of each segment.
3) Add sectional areas of segments= total sectional area.
4) Multiply total section area with the length of girder = volume or concrete work
To make the calculation, the solution is given to the following problem :-
Problem : Determine the volume of concrete work for the specified girder. Consider the length of the girder as 20 feet. If there is any steel, just omit it.
Area of figure 1 = 24” x 6” = 144 in2
Area of figure 2 = 36” x 6” = 216 in2
Area of figue 3 = 24” x 6” = 144 in2
So, entire sectional area = 504 in2
Now convert it to square inches to square feet by dividing it with 12 x 12
So, total sectional area = 3.5 ft2
Volume of the girder = sectional area x length
After putting the all the values we get :-
Volume of the girder = 3.5 x 20 = 70 ft3
To learn how the calculation is made by applying other examples, go through the following video tutorial.
Video Source: SL Khan
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