Determine the amount of rebar needed for the slab in Problem 56. The slab is reinforced with #4 rebar at 18 inches on center both ways. Assume two inches of cover and add 10 percent for lap and waste.
What will be an ideal response?
Start with the 25? by 30? area. The long bars are 29?8? (30? – 2 × 2) long. Determine the number of long bars:
Long bar spaces = 25? / 1.5? = 17 spaces.
Add 1 to get the number of long bars – Use 18 bars
Total length of long bars (lf) = 18 bars × 29?8? per bar = 534 lf
The short bars are 24?8? (25? – 2 × 2) long. Determine the number of short bars:
Short bar spaces = 30? / 1.5? = 20 spaces.
Add 1 to get the number of short bars – Use 21 bars
Total length of short bars (lf) = 21 bars × 24?8? per bar = 518 lf
Calculate the rebar for the 15? by 20? area. The long bars are 19?8? (20? – 2 × 2) long. Determine the number of long bars:
Long bar spaces = 15? / 1.5? = 10 spaces.
Add 1 to get the number of long bars – Use 11 bars
Total length of long bars (lf) = 11 bars × 19?8? per bar = 216 lf
The short bars are 14?8? (15? – 2 × 2) long. Determine the number of short bars:
Short bar spaces = 20? / 1.5? = 14 spaces.
Add 1 to get the number of short bars – Use 15 bars
Total length of short bars (lf) = 15 bars × 14?8? per bar = 220 lf
Total length of rebar (lf) = 534 lf + 518 lf + 216 lf + 220 lf = 1,488 lf
Total weight of rebar (pounds) = 1,488 lf × 0.668 pounds per lf = 994 pounds
Add for waste and lap.
Total weight of bars (pounds) = 994 pounds × 1.10 = 1,093 pounds
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