For wood frame shear walls in California, what is the maximum allowable height-to-width aspect ratio for a shear wall segment when using 15/32-inch structural wood sheathing with 8d nails at 6 inches on center at panel edges?
Correct Answer
C) 3.5:1
CBC Table 2306.3.1 limits shear wall aspect ratios to 3.5:1 for the specified nailing schedule with structural wood sheathing. This limitation ensures proper load transfer and prevents excessive deflection that could compromise the lateral force resisting system's performance during seismic events.
Why This Is the Correct Answer
CBC Table 2306.3.1 sets the maximum height-to-width ratio for wood structural panel shear wall segments at 3.5:1. This limit controls shear wall deflection and ensures adequate stiffness in the lateral force resisting system during seismic events.
Why the Other Options Are Wrong
Option A: 5:1
A 5:1 ratio is too lenient and not permitted under the CBC for wood structural panel shear walls. Such a slender wall would deflect excessively and lose effectiveness as a lateral element.
Option B: 4:1
4:1 is not the code-specified limit for standard wood structural panel shear walls under these conditions. This is a plausible distractor but exceeds the 3.5:1 maximum in CBC Table 2306.3.1.
Option D: 2:1
2:1 is overly restrictive and is not the standard maximum aspect ratio for these sheathing conditions. It may appear in special cases or with reduced capacity adjustments, but the standard limit is 3.5:1.
Memory Technique
Remember '3.5 is the max for shear wall flex' — the 3.5:1 ratio is the CBC's standard limit for wood structural panels. Think of it as 3 and a half floors tall per 1 foot of width at most.
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In California seismic design category D2, what is the required nail spacing for structural wood panel sheathing at panel edges when used for shear wall construction?
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