The new Response Spectrum Analysis study estimates the peak values of your model's response based on a design spectrum specified as a base excitation.
In a response spectrum analysis, the results of a modal analysis are used in terms of a known spectrum to calculate displacements and stresses in the model. For each mode, a response is read from a design spectrum based
on the modal frequency and a given damping ratio. All modal responses are then
combined to provide an estimate of the maximum response of the
structure.
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Relative displacement response spectrum for a particular damping ratio ξ1.
 equals the maximum absolute value of the relative displacement time history response for each SDOF oscillator.
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 Natural circular frequency of vibration for each SDOF oscillator.
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You can use a response spectrum analysis rather than a time history analysis to estimate the response of structures to random or time-dependent loading environments such as earthquakes, wind loads, ocean wave loads, jet engine thrust or rocket motor vibrations.