Determine the amount of rebar needed for the spread footing Figure 11.41. The dowels extend 24 inches into the column. Allow for three inches of cover.
What will be an ideal response?
The dowels extend 24 inches into the column, 27 inches (30? – 3?) into the footing, and turn and continue for 30 inches (96?/2 – 36?/2). Their total length is 81 inches.
Total bar length (lf) = 28 bars × 81? per bar / 12 in per ft = 189 lf
Total bar weight (pounds) = 189 lf × 4.303 pounds per lf = 813 pounds
The short horizontal bars are 90 inches long (96? – 3 × 2?).
Spacing = (17? × 12 in per ft – 3 × 2?) / 9? = 22 spaces
Add 1 to get the number of short horizontal bars – Use 23 bars per side
Total length of short horizontal bars (lf) = 2 × 23 × 90? / 12 in per ft = 345 lf
Total weight of short horizontal bars (pounds) = 345 lf × 2.67 pounds per lf
Total weight of short horizontal bars (pounds) = 921 pounds
The long horizontal bars are 198 inches long (17? × 12 in per ft – 3 × 2?)
Spacing = (96? – 3 × 2?) / 9? = 10 spaces
Add 1 to get the number of long horizontal bars – Use 11 bars per side
Total length of long horizontal bars (lf) = 2 × 11 × 198? / 12 in per ft = 363 lf
Total weight of long horizontal bars (pounds) = 363 lf × 2.67 pounds per lf = 969 pounds
Total weight (pounds) = 813 pounds + 921 pounds + 969 pounds = 2,703 pounds
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