Characterization of Different Site Category Method on Strong Ground Motion

Abstract eng:
The average shear-wave velocity of the top 30 m (vS30) of the earth is an important parameter used in classifying sites in US building codes. In China building code, the average shear-wave velocity of the top 20 m (vS20) of the near surface and depth of the soil are both used in classifying sites. The comparison of site classification between China and US code provisions has been carried out. And the relationship between two site classifications has been found. The PEER NGA strong motion Database has been used as dataset. Site condition of each record in the dataset has been classified by China building codes. The characterization of strong motion for the China classifying dataset has been analyzed. The fuzzy of classification can make uncertainty. For one site, adoption of China or US site classification can cause different ground shaking level assessment. So the uncertainty of site category should be taken account in seismic hazard or risk analyze.

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