地震時の地動と地震波の入力損失 (第1報)

概要

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At the present time, the method of analysis most commonly used for the earthquake response of structure is based on the assumation that the soil ground vibrates in phase and same amplitude just beneath the foundation. But it is very doubtful whether the buildings having horizontally large scale as school building and apartment hause vibrate as if they are rested on an artificial vibration table. Such a question has been talked about among earthquake engineers for a long time. The greater part of damaged buildings were occupied by school buildings, that is to say, the buildings having horizontally larger scale in Tokachi-oki earthquake. Many after-shocks were observed in Hachinohe district with the objects of inquiring the causes of individual damages and investigating the general correlation between ground motion and building response. As the results of those observations, it was proved that there were remarkable phase differences among the movement of every point of building foundation during earthquake motion. The correlation between the movements of building foundation and its surrounding ground was also made clear. The correlation was found to be mostly affected by the wavelength which appeared ground surface. The correlations between ground motions during earthquake and the response of building are subjectively discussed in this paper.
1969-11-30