A structural drawing shows a beam with the notation '#4 @ 12" O.C.' What does this specify?
Correct Answer
C) Number 4 rebar spaced 12 inches on center
The notation '#4 @ 12" O.C.' specifies Number 4 reinforcement bars (rebar) placed at 12-inch intervals on center. This is standard reinforcement notation used in structural drawings.
Why This Is the Correct Answer
The notation '#4 @ 12" O.C.' is standard reinforcement notation used throughout the construction industry. The '#4' specifically refers to Number 4 rebar, which has a diameter of 1/2 inch. The '@ 12" O.C.' means the rebar is spaced at 12-inch intervals measured from center to center of each bar. This notation system is universally used in structural drawings to specify reinforcement placement in concrete elements.
Why the Other Options Are Wrong
Option B: 4 beams spaced 12 inches apart
Beam dimensions are shown differently on structural drawings, typically as depth x width (e.g., '12x4' or 'W12x4' for steel beams). The '#' symbol and 'O.C.' notation are exclusive to reinforcement specifications, not member sizing.
Option D: 4 anchor bolts at 12-inch centers
The '#' symbol in construction drawings specifically denotes rebar size, not the number of structural members. If the drawing intended to show 4 beams, it would use different notation such as '(4) BEAMS' or show them individually on the plan view.
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