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?
Correct Answer
B) 3.5:1
CBC Section 2305.3.8.1 limits wood structural panel shear wall segments to a maximum aspect ratio of 3.5:1 in Seismic Design Categories D, E, and F. This limitation ensures adequate stiffness and prevents excessive deflection during seismic events, which is critical for California's high seismic risk areas.
Why This Is the Correct Answer
Option B (3.5:1) is correct per CBC Section 2305.3.8.1. In Seismic Design Categories D, E, and F, wood structural panel shear wall segments are limited to a maximum height-to-width (aspect) ratio of 3.5:1. This limit controls wall deflection and ensures the shear wall acts as a rigid element rather than an overly flexible one during seismic loading.
Why the Other Options Are Wrong
Option A: 4:1
Option A (4:1) is incorrect for California SDC D conditions. The 4:1 ratio is the standard IBC limit for shear walls in lower seismic design categories (A, B, C). California's CBC imposes the stricter 3.5:1 limit in SDC D specifically because of the state's high seismic hazard. Applying 4:1 in SDC D would be a code violation.
Option C: 2:1
Option C (2:1) is incorrect as the stated maximum. A 2:1 aspect ratio is very conservative and would certainly comply with the code, but the CBC maximum (the highest ratio allowed) is 3.5:1, not 2:1. The question asks for the maximum allowed, not a recommended safe ratio.
Option D: 5:1
Option D (5:1) is incorrect. A 5:1 aspect ratio would produce an excessively slender wall segment that deflects far beyond acceptable limits during seismic events. No CBC provision permits a 5:1 wood shear wall aspect ratio in any seismic design category. This is an unsafe configuration.
Memory Technique
Remember: 'SDC D = 3.5 max.' The D in SDC D acts as a reminder to 'Decrease from 4 to 3.5.' A simple mnemonic: 'In D, drop a half' (from 4:1 to 3.5:1). This single fact — that California SDC D lowers the standard 4:1 limit to 3.5:1 — is one of the most testable details in California seismic design.
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