When constructing reinforced masonry walls in California's Seismic Design Category D, what is the maximum spacing allowed between vertical reinforcing bars according to the CBC?
Correct Answer
C) 32 inches on center
CBC Section 2107.2.2.2 limits vertical reinforcement spacing to 32 inches on center maximum for reinforced masonry in seismic design categories. This requirement ensures adequate ductility and strength distribution throughout the masonry wall system, which is essential for earthquake resistance in California's high seismic zones.
Why This Is the Correct Answer
CBC Section 2107.2.2.2 limits vertical reinforcement spacing to a maximum of 32 inches on center for reinforced masonry in Seismic Design Category D. This spacing provides the ductility and lateral load distribution required for earthquake resistance without over-reinforcing the wall.
Why the Other Options Are Wrong
Option A: 48 inches on center
48 inches on center is too wide a spacing for Seismic Design Category D. This spacing may apply in lower seismic categories but does not meet the more stringent CBC requirements for California's high-seismic zones.
Option B: 16 inches on center
16 inches on center is more conservative than required. While tighter spacing is permissible and sometimes used, it is not the maximum allowed — the code allows up to 32 inches.
Option D: 24 inches on center
24 inches on center is within the allowed limit but is not the maximum. The CBC permits up to 32 inches, making 24 inches more conservative than required but not the answer to what is 'maximum allowed.'
Memory Technique
For SDC D masonry walls: 32 inches = 2 standard block widths plus a little extra. Picture two concrete blocks (16" each) laid end-to-end = 32" max rebar spacing. Easy to visualize on site.
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