Determine the amount of rebar needed for the grade beam in Problem 49. Allow for three inches of cover. Add 10 percent for lap and waste to the continuous bars.

What will be an ideal response?


The ties are 6 inches (12? – 2 × 3?) by 10 inches (16? – 2 × 3?). The length of the ties is 32 inches (6? + 10? + 6? + 10?). The number of ties is calculated as follows:

Number of spaces = 35? × 12 in per ft / 6? = 70 spaces

Add 1 to get the number of ties – Use 71 ties

Total length of ties (lf) = 71 ties × 32? / 12 in per ft = 189 lf

Total weight of ties (pounds) = 189 lf × 0.376 pounds per lf = 71 pounds

The continuous bars are calculated as follows:

Total length of continuous bars (lf) = 4 × 35? = 140 lf

Total weight of continuous bars (pounds) = 140 lf × 0.668 pounds per lf = 93.5 pounds

Add for waste and lap.

Total weight of horizontal bars (pounds) = 93.5 pounds × 1.10 = 103 pounds

Total weight of rebar (pounds) = 71 pounds + 103 pounds = 174 pounds

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