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4Šª
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1975”N
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463-470•Å
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PROCEEDINGS OF JAPAN EARTHQUAKE ENGINEERING SYMPOSIUM
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Yoshihiro SUGIMURA
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ESRTHQUAKE OBSERVATION AND DYNAMIC DYNAMIC ANALYSIS OF PILE-SUPPORTED BUILDING
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This paper introduces some results of earthquake observation through twenty one components of seismograph which were stationed underground, in pile and in superstructure, and of some theoretical analyses, which were carried out to investigate the dynamic behavior of a fourteen-storied residential building supported on long piles during earthquakes. Seven observed earthquakes were chosen as the subjects of this study and spectral analyses such as power spectral density and spectral ratio were computed for acceleration data of each location. On the other hand, response analyses and frequency analyses were executed for analytical models of ground and building. The summary of conclusion after synthetical research on comparing results of observation and analysis is shown below. l) Ground and piles behave identically with each other except the vicinity of pile cap. 2) It doesn't matter in practical application to use simple analytical model as for investigation of frequency property of ground-pile-building interaction system. 3) As for amplification ratio, however, some problems remain so that a further improvement will be required such as introduction of rocking effect at pile cap, suitable evaluation of damping property of pile foundation and so on.
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