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Arrange the following steps of a response spectrum analysis in the correct order.

1. Compute mode shapes and periods   2. Read spectral ordinates   3. Combine modal responses   4. Assemble mass and stiffness matrices

  • A.1, 2, 4, 3
  • B.4, 1, 2, 3
  • C.1, 4, 2, 3
  • D.4, 2, 1, 3

Answer: B

The matrices come first, the eigenvalue problem then yields periods and mode shapes, the spectrum is read at each period, and only then are the modal contributions combined. Reading the spectrum before the periods are known is impossible.

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