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Effect of Depth-Dependent Shear Wave Velocity Profiles on Site Amplification
https://orcid.org/http://orcid.org/0000-0002-1760-9838
Geological conditions such as soil depth to bedrock, soil types, and shear wave velocity (VS) profile can significantly affect the seismic response of a site. Previous studies have shown that using coarse VS profiles could lead to considerable errors in predicting seismic responses using one-dimensional site response analysis. These errors can be avoided by applying the depth-dependent VS gradient within a soil layer. Therefore, this paper aims to evaluate the effect of the soil VS gradient on the PGA, short-period, and long-period site coefficients for several hypothetical sites. A series of sensibility study is performed for different soil types, soil thicknesses, soil VS values, and impedance ratios between the soil and the underlying bedrock. In the current work, the median amplification spectra are computed for both constant and depth-dependent VS profiles with ten selected ground-motion suites. Its mean value is calculated over the 0.1–0.5 s and 0.4–2.0 s period ranges to determine the mean Fa and the mean Fv, respectively. The study has shown that by applying depth-dependent VS gradient within a soil layer could lead to a rise in site amplification and a reduction in the characteristic site period. The Arias intensity (IA) obtained for the depth-dependent VS profiles are greater than those for the constant VS profiles. Further adjustment of the soil VS would result in lesser change in amplification for shallower sites associated with higher impedance contrast at soil–bedrock interface. In addition, for the different site classes, a detailed comparison is drawn between the site coefficients obtained in the present study and those recommended by Minimum Design Loads and Associated Criteria for Buildings and Other Structures (ASCE/SEI 7–16).
Effect of Depth-Dependent Shear Wave Velocity Profiles on Site Amplification
https://orcid.org/http://orcid.org/0000-0002-1760-9838
Geological conditions such as soil depth to bedrock, soil types, and shear wave velocity (VS) profile can significantly affect the seismic response of a site. Previous studies have shown that using coarse VS profiles could lead to considerable errors in predicting seismic responses using one-dimensional site response analysis. These errors can be avoided by applying the depth-dependent VS gradient within a soil layer. Therefore, this paper aims to evaluate the effect of the soil VS gradient on the PGA, short-period, and long-period site coefficients for several hypothetical sites. A series of sensibility study is performed for different soil types, soil thicknesses, soil VS values, and impedance ratios between the soil and the underlying bedrock. In the current work, the median amplification spectra are computed for both constant and depth-dependent VS profiles with ten selected ground-motion suites. Its mean value is calculated over the 0.1–0.5 s and 0.4–2.0 s period ranges to determine the mean Fa and the mean Fv, respectively. The study has shown that by applying depth-dependent VS gradient within a soil layer could lead to a rise in site amplification and a reduction in the characteristic site period. The Arias intensity (IA) obtained for the depth-dependent VS profiles are greater than those for the constant VS profiles. Further adjustment of the soil VS would result in lesser change in amplification for shallower sites associated with higher impedance contrast at soil–bedrock interface. In addition, for the different site classes, a detailed comparison is drawn between the site coefficients obtained in the present study and those recommended by Minimum Design Loads and Associated Criteria for Buildings and Other Structures (ASCE/SEI 7–16).
Effect of Depth-Dependent Shear Wave Velocity Profiles on Site Amplification
https://orcid.org/http://orcid.org/0000-0002-1760-9838
Geological conditions such as soil depth to bedrock, soil types, and shear wave velocity (VS) profile can significantly affect the seismic response of a site. Previous studies have shown that using coarse VS profiles could lead to considerable errors in predicting seismic responses using one-dimensional site response analysis. These errors can be avoided by applying the depth-dependent VS gradient within a soil layer. Therefore, this paper aims to evaluate the effect of the soil VS gradient on the PGA, short-period, and long-period site coefficients for several hypothetical sites. A series of sensibility study is performed for different soil types, soil thicknesses, soil VS values, and impedance ratios between the soil and the underlying bedrock. In the current work, the median amplification spectra are computed for both constant and depth-dependent VS profiles with ten selected ground-motion suites. Its mean value is calculated over the 0.1–0.5 s and 0.4–2.0 s period ranges to determine the mean Fa and the mean Fv, respectively. The study has shown that by applying depth-dependent VS gradient within a soil layer could lead to a rise in site amplification and a reduction in the characteristic site period. The Arias intensity (IA) obtained for the depth-dependent VS profiles are greater than those for the constant VS profiles. Further adjustment of the soil VS would result in lesser change in amplification for shallower sites associated with higher impedance contrast at soil–bedrock interface. In addition, for the different site classes, a detailed comparison is drawn between the site coefficients obtained in the present study and those recommended by Minimum Design Loads and Associated Criteria for Buildings and Other Structures (ASCE/SEI 7–16).
Effect of Depth-Dependent Shear Wave Velocity Profiles on Site Amplification
Transp. Infrastruct. Geotech.
Eskandarinejad, Alireza (author) / Shiau, Jim (author) / Keawsawasvong, Suraparb (author)
Transportation Infrastructure Geotechnology ; 10 ; 1255-1283
2023-12-01
29 pages
Article (Journal)
Electronic Resource
English
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