地震動のエネルギー入力率スペクトル

概要

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A new non-stationary spectrum termed 'energy input rate spectrum' is formulated in order to assess when, at which frequencies, and how much damage potential is contained in a seismic wave. This spectrum indicates the energy input rates per unit mass exerted by the effective ex-citation forces acting on viscously damped linear oscillators with various natural frequencies. This spectrum is mathematically equivalent to Page's instantaneous power spectrum smoothed along the frequency coordinate by a set of spectral windows, which are the real parts of complex frequency velocity response functions, for the oscillators. Especially in the case of no damping, the spectrum is identical to Page's instantaneous power spectrum. The advantages of this spectrum are that the damping constant influences only on the smoothness along the frequency coordinate, and that it can follow the abrupt changes of non-stationary signals. This spectrum is suitable for the visualization of the non-stationary seismic damage potential distributed along the frequency-time coordinates.
社団法人日本建築学会の論文
1991-02-28