Earthquake Excitation
After a visual introduction to the variety of different earthquake excitations, we define the response spectrum in terms of peak deformation as a function of SDOF characteristics.
Pseudo spectra (velocity and accelerations) simply replicate the information in the deformation response spectrum, but are convenient as they directly relate to different aspects of structural response.
From statistical analysis it is possible to infer some common characteristics of response spectra and develop an idealized model of a consistent set of response spectra in terms of simple parameters of the ground motion.
Design spectra are envelopes () of spectral response ordinates.
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