Discussion
A structure whose response to shaking dies away quickly is best described as having
Answer: D
Correct answer: a relatively high damping ratio
Damping is the mechanism that removes energy from the system, so the rate of decay measures it directly - which is what a logarithmic decrement calculation exploits.
The other options mistake the cause. Low damping gives slow decay, the opposite of what is described; mass and stiffness together fix the period and the number of cycles per second, but not how quickly the motion dies. A structure with a long period simply oscillates slowly, however fast it decays.
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