ABSTRACT
This study evaluates site classification methods in seismic codes (China, US, Japan) using KiK-net strong-motion records and borehole data. Sites were classified per each code, and ground motion records were grouped by category. Statistical analyses of acceleration response spectra (including peak acceleration) and residual analysis were conducted to assess spectral consistency within the same site class across different classification systems. Results demonstrate that, among the site classification methods studied, the site classification method specified in the Chinese seismic design code, a two-index site classification method based on the equivalent shear wave velocity of soil layers within a 20 m depth and the thickness of the overlying soil layers as control parameters, is considered the optimal method.
