Determine the amount of rebar needed for the continuous footings shown in Figures 10.38 and 10.39. Allow for two inches of cover and extend the dowels 15 inches into the wall. Add 10 percent for lap and waste to the continuous bars.
What will be an ideal response?
From Problem 24, the length of the footing is 163 ft. The number of short bars and dowels is calculated as follows:
Number of spaces = 163? / 1? = 163 spaces
Add 1 to get the number of dowels or short bars – Use 164 dowels and short bars
The short bars are 32? (36? – 2 × 2?) long.
Total bar length (lf) = 164 short bars × 32? per bar / 12 in per ft = 437.3 lf
Total bar weight (pounds) = 437.3 lf × 0.668 pounds per lf = 292 pounds
The dowels extend 15 inches into the wall, 13 inches (15? – 2?) into the footing, and then turn and continue for 12 inches (12? + 2? – 2?). Their total length is 40 inches. There are two sets of dowels, one on each side of the wall.
Total bar length (lf) = 2 × 164 dowel × 40? per dowel / 12 in per ft = 1,093 lf
Total bar weight (pounds) = 1,093 lf × 1.043 pounds per lf = 1,140 pounds
The continuous bars are calculated as follows:
Total length of long bars (lf) = 163? × 5 bars = 815 lf
Total weight of long bars (pounds) = 815 lf × 0.668 pounds per lf = 544 pounds
Add for waste and lap.
Total weight of long bars (pounds) = 544 pounds × 1.10 = 598 pounds
Total weight of rebar (pounds) = 292 pounds + 1,140 pounds + 598 pounds
Total weight of rebar (pounds)= 2,030 pounds
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