According to California's seismic requirements, what is the maximum allowable height-to-width ratio for wood structural panel shear walls with framing of Douglas Fir-Larch or Southern Pine?
Correct Answer
C) 3.5:1
CBC Section 2305.3.8.1 limits the height-to-width ratio of wood structural panel shear wall segments to 3.5:1 when framing is Douglas Fir-Larch, Southern Pine, or other species with specific gravity of 0.42 or greater. This limitation prevents excessive deflection and ensures adequate overturning resistance in seismic events, which is critical for California's high seismic design requirements.
Why This Is the Correct Answer
Option C is correct. CBC Section 2305.3.8.1 establishes a maximum height-to-width (h/w) ratio of 3.5:1 for wood structural panel shear wall segments when the framing is Douglas Fir-Larch, Southern Pine, or other species with a specific gravity of 0.42 or greater. This limit controls wall deflection and ensures the panel can resist the overturning forces generated during seismic events — critical in California's high seismic zones.
Why the Other Options Are Wrong
Option A: 2:1
A 2:1 ratio is more restrictive than required by code and would unnecessarily limit shear wall design flexibility. While some proprietary connectors allow higher ratios with specific hardware, 2:1 is not the standard CBC maximum for wood structural panels with qualifying lumber species.
Option B: 4:1
4:1 exceeds the CBC limit for standard wood structural panel shear walls. A 4:1 ratio applies in some steel stud shear wall contexts or when specific hold-down hardware is used, but not for standard wood-framed panels under CBC Section 2305.3.8.1.
Option D: 5:1
5:1 is far too slender and would cause excessive deflection and potential shear wall failure during seismic loading. This ratio is not permitted for wood structural panel shear walls under any standard CBC provision.
Memory Technique
Think '3.5 for strength' — Douglas Fir and Southern Pine are strong species (specific gravity ≥ 0.42), so the code rewards them with the 3.5:1 ratio. Weaker species get a more restrictive ratio. 3.5 = strong wood gets more height.
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