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Match the period range with the controlling ground motion parameter.

1. Very short period   2. Intermediate period   3. Very long period

P. Peak ground displacement   Q. Peak ground acceleration   R. Peak ground velocity

Select the correct matching.

  • A.1-R, 2-Q, 3-P
  • B.1-Q, 2-R, 3-P
  • C.1-P, 2-R, 3-Q
  • D.1-Q, 2-P, 3-R

Answer: B

A very stiff system follows the ground and its acceleration approaches the ground's; a very flexible one stays still and its relative displacement approaches the ground displacement; velocity governs the middle. That is the structure of every spectrum.

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