Determine the amount of rebar needed for two of the spread footings shown in Figure 11.40. Allow for two inches of cover.
What will be an ideal response?
The dowels extend 34 inches (36? – 2?) into the columns, 8 inches (10? – 2?) into the footing, and turn and continue for 9 inches (30? / 2 – 12? / 2). Their total length is 51 inches.
Total bar length (lf) = 2 × 4 bars × 51? per bar / 12 in per ft = 34 lf
Total bar weight (pounds) = 34 lf × 1.043 pounds per lf = 35.5 pounds
The horizontal bars are 26 inches long (30? – 2 × 2?) and there are eight bars per footing, four in each direction.
Total length of horizontal bars (lf) = 2 × 8 × 26? / 12 in per ft = 34.7 lf
Total weight of horizontal bars (pounds) = 34.7 lf × 0.668 pounds per lf = 23.2 pounds
Total weight (pounds) = 35.5 pounds + 23.2 pounds = 58.7 pounds
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