A base plate uses 4 anchor rods. If 18 columns use the same base plate, how many anchor rods are required?
Correct Answer
C) 72 anchor rods
Anchor rods required are 18 columns x 4 rods/column = 72 anchor rods.
Why This Is the Correct Answer
Anchor rods required are 18 columns x 4 rods/column = 72 anchor rods.
Why the Other Options Are Wrong
Option A: 18 anchor rods
anchor bolt group count, choice a: 18 anchor rods is wrong because 18 anchor rods counts a different spacing, panel, or repeated member quantity.
Option B: 64 anchor rods
anchor bolt group count, choice b: 64 anchor rods counts a different spacing, panel, or repeated member quantity.
Option D: 88 anchor rods
anchor bolt group count, choice d: 88 anchor rods is wrong because 88 anchor rods counts a different spacing, panel, or repeated member quantity.
Memory Technique
Remember anchor bolt group count as "base, adjustment, final unit"; the last unit should read 72 anchor rods.
Reference Hint
Open Steel Construction Manual, 15th Ed.; Steel Deck Institute and Steel Joist Institute standard practice; use the index entry or section for "Anchor rod quantity" to confirm that Anchor rods required are 18 columns x 4 rods/column = 72 anchor rods.
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