Vertical reinforcing is required at 32 in. on center along an 80 ft CMU wall, with a bar at each end. Each bar length including splice projection is 15 ft. What total reinforcing length is needed?
Correct Answer
B) 465 lf
The wall length is 80 x 12 = 960 in. Spaces at 32 in. give 960/32 = 30 spaces, so 31 bars are needed with bars at both ends. Total length is 31 x 15 = 465 lf. Other choices: 450 lf counts only 30 bars, 480 lf rounds the bar count upward incorrectly, and 405 lf uses a shorter bar length.
Why This Is the Correct Answer
The wall length is 80 x 12 = 960 in. Spaces at 32 in. give 960/32 = 30 spaces, so 31 bars are needed with bars at both ends. Total length is 31 x 15 = 465 lf. Other choices: 450 lf counts only 30 bars, 480 lf rounds the bar count upward incorrectly, and 405 lf uses a shorter bar length.
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