Discussion
A tall flexible building compared with a short stiff one has a
Answer: B
Correct answer: longer natural period
Height brings flexibility, and \( T = 2\pi\sqrt{m/k} \) lengthens as stiffness falls. A useful consequence is that a tall building sits further down the descending branch of the spectrum and attracts a lower acceleration coefficient than a squat stiff one at the same site - but its displacements and its sensitivity to long-period motion are correspondingly greater.
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