3.7 A foundation plan for a residence is given by Fig. P3.7. Find the volume in

Question

3.7 A foundation plan for a residence is given by Fig. P3.7. Find the volume in yd if waste is as- w/ sumed to be 1 %. Discuss various methods for doing these volumetric calculations. The cost of 4000-psi concrete is $78.50/yd·What is the bid? (Hints: Dimensions are in ft. In doing any “mensuration" calculations for construction quantities, an important purpose is to min imize the errors of simple arithmetic, and outside of having CAD provide the yd, many of quantity take- off procedures require a calculator. There are rules of arithmetic, even for simple problems.) 60' 20 2'x ' Footing 18" 3 "x Footing 30 25 Figure P3.7

Explanation / Answer

total length 0f 3'x1' footing = 25x2+30x2= 110 ft volume= 110x3x1=330 ft3

total length of 2'x1' footing =33+20+60+18= 131 ft volume= 131x2x1= 262 ft3

total volume= 330+262=592 ft3 = 592/27 =21.926 yd3

1% waste including total volume=1.01*21.926 =22.145 yd3

cost= 78.4*22.145= $1738.38

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