In California seismic design categories D, E, and F, what is the maximum spacing allowed between horizontal reinforcement in grouted masonry walls per CBC requirements?
Correct Answer
B) 24 inches on center
CBC Section 2103.13 and Table 2103.13(1) specify that in seismic design categories D, E, and F, horizontal reinforcement in grouted masonry walls must be spaced no more than 24 inches on center. This closer spacing is required in high seismic zones to provide adequate ductility and resistance to lateral forces.
Why This Is the Correct Answer
The California Building Code Section 2103.13 and Table 2103.13(1) specifically require horizontal reinforcement in grouted masonry walls to be spaced no more than 24 inches on center in seismic design categories D, E, and F. This reduced spacing from the standard 48 inches is mandated in high seismic zones to provide enhanced ductility, better load distribution, and improved resistance to lateral seismic forces that are characteristic of these more stringent seismic design categories.
Why the Other Options Are Wrong
Option C: 48 inches on center
16 inches on center, while providing excellent reinforcement, is more restrictive than required by code. This spacing would be unnecessarily conservative and costly, as the CBC specifically allows up to 24 inches on center in these seismic categories.
Option D: 32 inches on center
32 inches on center exceeds the maximum spacing requirement for high seismic zones. While this spacing might be acceptable in lower seismic design categories, it does not provide adequate reinforcement density needed for the enhanced seismic resistance required in categories D, E, and F.
Memory Technique
Remember '24 for DEF' - in seismic categories D, E, and F, horizontal reinforcement spacing is limited to 24 inches maximum.
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