For buildings in California Seismic Design Category E, what is the maximum story drift ratio allowed for structures with a fundamental period less than 0.7 seconds?
Correct Answer
D) 0.020
CBC Section 1617.3 and ASCE 7 Table 12.12-1 specify that for Seismic Design Category E structures with periods less than 0.7 seconds, the allowable story drift ratio is 0.020. This stringent limit helps prevent structural and non-structural damage during the strong ground motions expected in California's highest seismic risk areas.
Why This Is the Correct Answer
CBC Section 1617.3 and ASCE 7 Table 12.12-1 specify that for Seismic Design Category E structures with periods less than 0.7 seconds, the allowable story drift ratio is 0.020. This stringent limit helps prevent structural and non-structural damage during the strong ground motions expected in California's highest seismic risk areas.
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