What is the maximum spacing for anchor bolts in wood sill plates according to California Building Code requirements for seismic regions?
Correct Answer
A) 6 feet on center
CBC Section 2308.6 specifies that anchor bolts shall be spaced not more than 6 feet on center and within 12 inches of the ends of each sill plate. This closer spacing compared to lower seismic regions ensures adequate connection between the foundation and wood frame structure to resist seismic forces.
Why This Is the Correct Answer
CBC Section 2308.6 mandates anchor bolt spacing of no more than 6 feet on center for wood sill plates in seismic regions, with bolts also required within 12 inches of each sill plate end. This requirement reflects the critical role anchor bolts play in transferring lateral seismic forces from the wood frame into the foundation. Tighter spacing ensures that shear loads are distributed evenly along the sill plate without overstressing any single bolt, which is especially important in California where seismic activity demands robust foundation-to-frame connections.
Why the Other Options Are Wrong
Option B: 8 feet on center
8 feet on center exceeds the CBC maximum of 6 feet. Wider spacing would leave longer unsupported spans of sill plate, reducing the structure's ability to transfer seismic shear forces to the foundation and increasing the risk of sill plate splitting or bolt failure during an earthquake.
Option C: 10 feet on center
10 feet on center far exceeds the code maximum and would create dangerously inadequate connections in seismic zones. This spacing would allow excessive movement between the sill plate and foundation, potentially leading to structural failure or building displacement during a seismic event.
Option D: 4 feet on center
4 feet on center is actually more conservative than required but is not the maximum spacing specified by CBC Section 2308.6. The question asks for the maximum allowed spacing, which is 6 feet. Using 4-foot spacing is permissible but goes beyond what the code mandates.
Memory Technique
Think 'Six-Foot Seismic Safety': anchor bolts in California must be within SIX feet of each other, just like you'd want safety anchors no more than 6 feet apart on a cliff face.
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When constructing a new single-family residence in California Seismic Design Category D, what is the minimum nominal diameter required for anchor bolts connecting the sill plate to the foundation?
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