Study on Design Input Motion for Seismic Design in Consideration of Local Site Characteristics in Hokkaido, Japan

Abstract eng:
This study was carried out to research seismic design, taking into consideration the local site characteristics. While in previous studies, acceleration response spectra used for seismic design was established using strong motion records in Hokkaido, and the seismic design based on the local earthquake risk was proposed. However, as a result of a more detailed investigation of calculated acceleration response spectra, it was found that intensity of spectra was uneven in area with similar earthquake risk. Therefore, to optimize the seismic design, a re-examination of the acceleration response spectra was carried out. The results indicated that, hypocentral distance held little influence over intensity and form of the acceleration response spectra, but site amplification factors (the ratio of peak ground surface velocity to peak bedrock velocity) had a substantial effect. Therefore, this study suggests methods to establish the acceleration response spectra using the site amplification factors.

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