The soil-structure interaction (SSI) can significantly alter the characteristics of recorded motions in buildings. The ratio of Fourier amplitude spectrum of the top-story accelerations to that of the foundation accelerations permits the identification of the natural frequency of the fixed-base building. In this study. records of the Chi-Chi earthquake and the 1226 Hengchun earthquake... https://allfixelectricales.shop/product-category/high-temperature-grease/