Discussion
The ground motion used for design is normally taken at
Answer: B
Correct answer: the free-field surface or the foundation level
Design motion is specified at the free-field ground surface, or at foundation level, because that is where the structure is excited. It is not the rock motion, which must be propagated up through the soil column first, and it is certainly not the roof motion, which is the structure’s response rather than the input to it.
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