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A limitation of response spectrum analysis is that it gives

  • A.results valid only for undamped structures
  • B.forces but never displacements
  • C.peak values without their algebraic signs
  • D.a complete time history of every response

Answer: C

Because the peaks are combined statistically the signs are lost, so quantities that must be combined consistently, such as axial force and moment in a column, need special treatment. Time history analysis retains the signs.

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