A composite beam line is 84 ft long. Studs are laid out at 12 in. on center, with a stud at both ends of the run. What stud count is required?
Correct Answer
A) 85 studs
At 12 in., or 1 ft, spacing, an 84 ft run has 84 spaces. With a stud at both ends, count spaces plus one: 85 studs. Other choices omit an end, add one too many, or use a shorter spacing.
Why This Is the Correct Answer
At 12 in., or 1 ft, spacing, an 84 ft run has 84 spaces. With a stud at both ends, count spaces plus one: 85 studs. Other choices omit an end, add one too many, or use a shorter spacing.
Why the Other Options Are Wrong
Option B: 84 studs
shear stud count, choice a: 84 studs is wrong because 84 studs counts the 84 one-foot spaces but omits the stud at the far end; 12 in. o.c. over 84 ft gives 84 spaces plus one end stud = 85 studs.
Option C: 86 studs
shear stud count, choice b: 86 studs adds one stud beyond the two-end layout; 84 spaces plus the far-end stud gives 85, not 86.
Option D: 90 studs
shear stud count, choice c: 90 studs assumes a spacing/count different from 12 in. on center with studs at both ends; the accepted count is 84 spaces + 1 end stud = 85.
Memory Technique
Say the shear stud count rule aloud as a chain; the chain ends at 85 studs, not an intermediate stop.
Reference Hint
Open Principles and Practices of Commercial Construction, 11th Ed., 2024; use the index entry or section for "Composite beam shear connector layout" to confirm that At 12 in., or 1 ft, spacing, an 84 ft run has 84 spaces.
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