The Development of Attenuation Relations in the Rock Sites for Periods (T=0.04～10S,ξ=0.005, 0.02, 0.07, 0.1 & 0.2) Based on NGA Database

Abstract eng:
The design spectrum with different damping ratio is in general calculated from the spectral values of damping ratio 0.05 using the empirical modification relations. With the large-scale and important structures, such as nuclear plant, being built in large number, the current aseismic Codes cannot address the requirements in the multi-damping and the long-period aspects. The large amount of recordings in the US NGA project makes it possible for us to study the multi-damping characteristics of acceleration response spectrum in the period range up to 10s. By the statistical analysis to the 260 recordings selected from the NGA database, the spectral acceleration attenuation relationships in the period range 0.04-10s are proposed for the damping ratios 0.005, 0.02, 0.07, 0.1, 0.2.

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