Abstract
The effect of uncertainty on the shear wave velocity (VS) profiles from the Korean soil conditions on the seismic site response analysis (SRA) was investigated by comparing the amplification factors (AFs) computed from 170 VS profiles to those from three (representative) statistically derived VS profiles (Approach 1: a constant standard deviation of VS, σln(Vs), Approach 2: a depth-dependent, σln(Vs), and Approach 3: 5% and 95% percentiles for generating lower and upper bounds). All of the VS profiles are divided into three site classes (B, C, and D) by the National Earthquake Hazards Reduction Program (NHERP) site classification system. Seven pairs of ground motion records (two horizontal components) that represent Korean bedrock conditions are entered into all of the three types of VS profiles to run the SRA with a single type of modulus reduction and damping curves. The root-mean squared difference (RMSD) of the mean and standard deviation, (μln(AF), and σln(AF)) of the AFs in natural log-scale between the three types of VS profiles is estimated, which results in Approach 3 with the smallest RMSD measure for all the site classes. Conventionally, characterizing the uncertainty of the VS profiles is typically assessed through the representative profiles of Approach 1; however, this practice suggests that the inclusion of the percentile bounds (Approach 3) can be supplemental to better describe the VS uncertainty while taking the Approach 1 as primary representative profiles.
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This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (NRF-2020R1C1C1013317).
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Cho, Y., Jang, YE. & Kim, B. Influence of Uncertainty in Vs Profiles in the Southeastern Korea On Site Response Analyses. KSCE J Civ Eng 26, 4235–4241 (2022). https://doi.org/10.1007/s12205-022-1696-7
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DOI: https://doi.org/10.1007/s12205-022-1696-7