地動が基礎の各点で異なる構造物の応答解析 : その 1. 入力地動について

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タイトル別名
  • ASEISMIC PROBREMS OF THE STRUCTURES SUBJECTED TO MULTI-INPUT SEISMIC WAVES : Part 1. Input Ground Motions
  • 地動が基礎の各点で異なる構造物の応答解析-1-入力地動について
  • チドウ ガ キソ ノ カク テン デ コトナル コウゾウブツ ノ オウトウ カ

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抄録

When the structures are subjected to multi-input seismic waves, two methods which are spectral analysis and time history analysis, are considered. In this paper the data which are needed in the analyses are researched. The theoretical correlation functions and spectral density functions between acceleration, velocity and displacement in three cases, are obtained. Those three cases are (a) the same seismic waves, (b) the seismic waves which have the same wave and the time lag and (c) the seismic waves which have only different Fourier amplitude spectra. From mean values of several power spectral density functions in accelerations, one equation is made, and mean square power and cross power spectral density functions are obtained. As the time history analysis, the method (a) by Fourier trans-form and the method (b) that the simulation of the seismogragh is used, are studied. The method (a) is the way that the lower frequency part of the Fourier amplitude spectra is cut off. The relations of the maximum values of the result's acceleration, velocity and displacement, are given with the cut-off frequency ω_c. The best result is given when the cut-off frequency ω_c equals to 1.0. The method (b) is the way that uses the filter which is disital simulation of simple pendulum. The velocity is obtained by the filter of which the period is too long, and the displacement is obtained by the filter of which the period and the damping coefficient are respectively 2.0sec. and 0.8, and the displacement's amplification factor equals to 2.7.

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