For wood structural panel shear walls in California Seismic Design Category D, what is the maximum aspect ratio (height-to-width) allowed for a shear wall segment when using 15/32-inch structural panels with 8d common nails at 4-inch spacing?
Correct Answer
A) 3.5:1
According to CBC Table 2306.3.1 and Section 2306.3.3, wood structural panel shear walls with the specified nailing pattern have a maximum height-to-width aspect ratio of 3.5:1 in Seismic Design Category D. This limitation ensures adequate stiffness and prevents buckling under California's seismic loading conditions.
Why This Is the Correct Answer
Per CBC Table 2306.3.1 and Section 2306.3.3, the maximum height-to-width aspect ratio for wood structural panel shear wall segments is 3.5:1, even with tighter 4-inch nail spacing in SDC D. This geometric limit ensures adequate lateral stiffness and prevents buckling regardless of nailing pattern.
Why the Other Options Are Wrong
Option B: 2:1
2:1 is far more restrictive than required. While shear walls with aspect ratios between 2:1 and 3.5:1 may require capacity adjustment factors, 2:1 is not the absolute maximum permitted by the CBC.
Option C: 4:1
4:1 exceeds the CBC limit for wood structural panel shear walls. Even with tighter nail spacing, the maximum permitted ratio remains 3.5:1 — the code does not reward closer nailing with a looser geometry limit.
Option D: 5:1
5:1 is not a recognized limit under CBC or IBC for wood structural panel shear walls. This ratio would produce an excessively slender wall prone to deflection and potential instability.
Memory Technique
No matter how tight you nail it, 3.5:1 is the wall. The aspect ratio limit is about shape, not fasteners — nail spacing affects capacity, not the maximum slenderness.
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