What is the maximum spacing for anchor bolts connecting wood sill plates to concrete foundations in Seismic Design Category D per the California Building Code?
Correct Answer
C) 6 feet on center
CBC Section 2308.3.1 specifies that anchor bolts must be spaced not more than 6 feet on center in Seismic Design Categories D, E, and F, with bolts required within 12 inches of each end of sill plates. This closer spacing compared to lower seismic zones ensures proper load transfer.
Why This Is the Correct Answer
CBC Section 2308.3.1 mandates anchor bolts spaced no more than 6 feet on center in Seismic Design Categories D, E, and F. This tighter spacing (compared to the 8-foot maximum allowed in lower seismic categories) ensures adequate shear force transfer between the wood framing and the concrete foundation during an earthquake.
Why the Other Options Are Wrong
Option A: 8 feet on center
8 feet on center is the maximum spacing permitted in lower seismic design categories (A, B, C). In SDC D, E, and F — which covers most of California — this spacing is too wide and does not meet the more stringent seismic requirements.
Option B: 10 feet on center
10 feet on center is not a recognized standard in the CBC for anchor bolt spacing. It exceeds even the less stringent 8-foot rule and would provide dangerously inadequate seismic connections in any California jurisdiction.
Option D: 4 feet on center
4 feet on center is more restrictive than required. While it would technically be safe, it is not the code maximum and represents unnecessary material and labor cost. The exam tests knowledge of the maximum allowed spacing, not the most conservative option.
Memory Technique
Associate 'D for Danger zone = 6 feet.' California is almost entirely in SDC D or higher, so for the California exam, default to 6 feet. Remember: '6 for seismic D, 8 for lower risk.'
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