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The modal participation factor indicates

  • A.how strongly a mode is excited by base motion
  • B.the damping present in that particular mode
  • C.the strength available in the members of that mode
  • D.the number of storeys involved in the mode

Answer: A

It measures how well the mode shape matches the pattern of inertia forces from a uniform base acceleration, so a mode with a small factor contributes little however large its spectral ordinate. The first mode usually dominates in a regular building.

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