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A tripartite plot displays a response spectrum in terms of

  • A.acceleration in three orthogonal directions
  • B.displacement, velocity and acceleration on one chart
  • C.three different damping ratios only
  • D.three separate earthquakes at once

Answer: B

Correct answer: displacement, velocity and acceleration on one chart

For a given period the three peak quantities are related by \( S_a \approx \omega S_v \approx \omega^2 S_d \), so on logarithmic axes each becomes a set of straight lines. The tripartite plot exploits this by drawing displacement and acceleration as two families of diagonal grid lines over a velocity plot, letting all three be read from one curve.

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