INVESTIGATION OF GROUND AMPLIFICATION FACTOR PREDICTION FORMULA BASED ON RELATIONSHIP BETWEEN SITE AMPLIFICATION FACTORS FOR ARIAS INTENSITY AND SITE EFFECTS

Abstract

 In this study, in order to accurately evaluate the Arias intensity used for damage prediction of infrastructures during an earthquake, we investigated the relationship between site amplification factors for Arias intensity and site effects. First, we derived the relational expression between Arias intensity, acceleration Fourier spectrum, and site effects. Next, we evaluated the site amplification factors and site effects of seismic observation sites in the Chugoku region, and the characteristics of their distribution was investigated. As a result of investigating the correlation between the amplification factor and the integrated value of the site amplification effect squared value, the integration range with a high correlation coefficient was clarified. Finally, the ground amplification factor prediction formula was obtained using the average S wave velocity of the surface layer 30 m and the information deeper than the engineering bedrock. As a result, it was clarified that the prediction accuracy is higher when the information deeper than the engineering bedrock is used.