Numerical Investigation of Vs Spatial Variability Effects on the Seismic Response Estimated Using 2D and 1D Site Response Analyses
Publication: Geo-Congress 2022
ABSTRACT
One-dimensional site response analyses (1D SRAs) are the most widely used tool to assess site-specific seismic response. However, compared to 2D and 3D SRAs, 1D SRAs are limited in their ability to capture some wave propagation mechanisms. Here, 2D and 1D SRAs are conducted on VS correlated random fields to evaluate: (1) the discrepancies in the median 2D and 1D seismic responses, (2) the effects of VS spatial variability features (e.g., correlation length, θ) on the 2D response, and (3) the effect of using 1D SRA-based ground motions to estimate intensity measures (IMs) towards getting insight into the seismic performance of geosystems. Results indicate that (1) median 2D responses are higher than median 1D responses, and the discrepancy increases with VS variability (σlnVs), (2) σlnVs has a stronger effect than other VS variability features on the 2D and 1D seismic responses, and (3) IMs might be underpredicted when estimated using 1D SRA-based ground motions, and thus the expected geosystems’ seismic performance overestimated.
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Geo-Congress 2022
Pages: 205 - 215
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Published online: Mar 17, 2022
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