A structural section drawing shows reinforcement bars labeled '#5 @ 12" O.C.' What does this notation mean?
Correct Answer
C) Number 5 bars spaced 12 inches on center
This notation indicates Number 5 reinforcement bars (5/8 inch diameter) spaced 12 inches on center. The '#' symbol refers to the bar size, and 'O.C.' means 'on center' spacing.
Why This Is the Correct Answer
The notation '#5 @ 12" O.C.' follows standard construction drawing conventions where the '#' symbol indicates the rebar size number (not quantity), the number '5' refers to #5 rebar which has a 5/8 inch diameter, and 'O.C.' is the standard abbreviation for 'on center' spacing. This means #5 reinforcement bars are placed with their centers 12 inches apart from each other throughout the structural element.
Why the Other Options Are Wrong
Option A: 5 bars total, each 12 inches long
The '#5' does not refer to a steel grade but to the bar size designation. Steel grades are specified separately (like Grade 60 or Grade 40), and the 12-inch measurement refers to spacing between bars, not depth placement.
Option D: Grade 5 steel at 12-inch depth
While #5 rebar is indeed 5/8 inch in diameter, the spacing would be 12 inches, not 12 feet. The notation shows 12" (inches) not 12' (feet), and 12-foot spacing would be extremely wide and impractical for most reinforcement applications.
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