Determine the amount of rebar needed for the slab in Problem 51. The slab is reinforced with #4 rebar at 12 inches on center both ways. Assume two inches of cover and add 10 percent for lap and waste.
What will be an ideal response?
The long bars are 99?8? (100? – 2 × 2) long. Determine the number of long bars:
Long bar spaces = 83? / 1? = 83 spaces.
Add 1 to get the number of long bars – Use 84 bars
Total length of long bars (lf) = 84 bars × 99?8? per bar = 8,372 lf
Total weight of long bars (pounds) = 8,372 lf × 0.668 pounds per lf = 5,592 pounds
The short bars are 82?8? (83? – 2 × 2) long. Determine the number of short bars:
Short bar spaces = 100? / 1? = 100 spaces.
Add 1 to get the number of short bars – Use 101 bars
Total length of short bars (lf) = 101 bars × 82?8? per bar = 8,349 lf
Total weight of short bars (pounds) = 8,349 lf × 0.668 pounds per lf = 5,577 pounds
Total weight of rebar (pounds) = 5,592 pounds + 5,577 pounds = 11,169 pounds
Add for waste and lap.
Total weight of rebar (pounds) = 11,169 pounds × 1.10 = 12,286 pounds
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