You are constructing a two-story wood frame house in Seismic Design Category D. The building is 28 feet wide. What is the maximum allowable story drift under CBC provisions?
Correct Answer
C) 1.12 inches
For wood frame construction in SDC D, the allowable story drift is 0.025 times the story height. Assuming 10-foot stories: 10 ft × 12 in/ft × 0.025 = 3 inches, but this is reduced by the Cd factor. For typical residential: 28 ft × 0.04 = 1.12 inches.
Why This Is the Correct Answer
For wood frame construction in SDC D, the allowable story drift is 0.025 times the story height. Assuming 10-foot stories: 10 ft × 12 in/ft × 0.025 = 3 inches, but this is reduced by the Cd factor. For typical residential: 28 ft × 0.04 = 1.12 inches.
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