Abstract
The author has studied and proposed transform methods of frequency dependent dynamic stiffness into time domain. Although various kinds of stiffness got to be transformed by the methods, some problems were still remained. In this paper, followings two problems were studied. First, the relation between the proposed transform methods and the Duhamel's integral was studied in order to understand the meaning of the 2 series of impulse responses obtained by the methods. Next, to expand the applicability of the methods, the time domain transfer function, obtained by the transform of frequency domain transfer function, was shown. The seismic response values are easily calculated in the time domain using the function without FFT. The efficiency of the function was confirmed by a practical example problem.
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