位相差分特性を考慮した設計用模擬地震動作成に関する研究 : その1 位相差分分布と地震動経時特性の関係に関する理論的背景

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The purpose of this paper is to demonstrate that the theoretical background of the similarity between the distribution of phase differences and the shape of the wave envelope can be clearly explained by using the concept of beat. The validity of this idea is verified by analyzing recorded earthquake motions. This idea, moreover, derives two significant results, that a wave with uniform phase differences becomes a pulse independently of Fourier amplitude, and that the position of the pulse on the time axis and the pulse type can be specified by the parameters of the phase difference and the initial phase angle. Comparing response spectra of two waves with identical Fourier amplitudes, it is illustrated that the response spectrum depends on Fourier phase as well as Fourier amplitude.
2002-03-30