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Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Uncertainties in Small-Strain Damping Ratio Evaluation and Their Influence on Seismic Ground Response Analyses
https://orcid.org/http://orcid.org/0000-0003-4505-5091
https://orcid.org/http://orcid.org/0000-0002-1170-9774
https://orcid.org/http://orcid.org/0000-0001-8955-4605
The ground response to seismic waves is governed by the geometry and the mechanical properties of the site. A proper characterization of the soil behavior is thus a fundamental aspect, and it should account for the uncertainties associated with the model parameters. In particular, the quantification of the small-strain damping is a critical task, especially in low-to-moderate seismicity areas. In the present paper, the main issues related to the definition of the damping at small strains are firstly treated in the light of the biases affecting both laboratory and in situ tests. Higher values of damping are expected in field, where wave scattering phenomena take place. The influence of the parameter on the overall site response is subsequently assessed through a stochastic database of ground response analyses. The results highlight a reduction of the expected ground motion at the surface, especially for deep and soft sites when site-based small-strain damping is selected. Finally, the differences between site and laboratory values are analyzed regarding a specific case study. The influence of the damping at small strains resulted to be comparable or even higher with respect to the uncertainties related to the shear wave velocity profile and the modulus reduction and damping curves. Therefore, a proper evaluation of the uncertainties in the small-strain damping evaluation should not be neglected.
Uncertainties in Small-Strain Damping Ratio Evaluation and Their Influence on Seismic Ground Response Analyses
https://orcid.org/http://orcid.org/0000-0003-4505-5091
https://orcid.org/http://orcid.org/0000-0002-1170-9774
https://orcid.org/http://orcid.org/0000-0001-8955-4605
The ground response to seismic waves is governed by the geometry and the mechanical properties of the site. A proper characterization of the soil behavior is thus a fundamental aspect, and it should account for the uncertainties associated with the model parameters. In particular, the quantification of the small-strain damping is a critical task, especially in low-to-moderate seismicity areas. In the present paper, the main issues related to the definition of the damping at small strains are firstly treated in the light of the biases affecting both laboratory and in situ tests. Higher values of damping are expected in field, where wave scattering phenomena take place. The influence of the parameter on the overall site response is subsequently assessed through a stochastic database of ground response analyses. The results highlight a reduction of the expected ground motion at the surface, especially for deep and soft sites when site-based small-strain damping is selected. Finally, the differences between site and laboratory values are analyzed regarding a specific case study. The influence of the damping at small strains resulted to be comparable or even higher with respect to the uncertainties related to the shear wave velocity profile and the modulus reduction and damping curves. Therefore, a proper evaluation of the uncertainties in the small-strain damping evaluation should not be neglected.
Uncertainties in Small-Strain Damping Ratio Evaluation and Their Influence on Seismic Ground Response Analyses
https://orcid.org/http://orcid.org/0000-0003-4505-5091
https://orcid.org/http://orcid.org/0000-0002-1170-9774
https://orcid.org/http://orcid.org/0000-0001-8955-4605
The ground response to seismic waves is governed by the geometry and the mechanical properties of the site. A proper characterization of the soil behavior is thus a fundamental aspect, and it should account for the uncertainties associated with the model parameters. In particular, the quantification of the small-strain damping is a critical task, especially in low-to-moderate seismicity areas. In the present paper, the main issues related to the definition of the damping at small strains are firstly treated in the light of the biases affecting both laboratory and in situ tests. Higher values of damping are expected in field, where wave scattering phenomena take place. The influence of the parameter on the overall site response is subsequently assessed through a stochastic database of ground response analyses. The results highlight a reduction of the expected ground motion at the surface, especially for deep and soft sites when site-based small-strain damping is selected. Finally, the differences between site and laboratory values are analyzed regarding a specific case study. The influence of the damping at small strains resulted to be comparable or even higher with respect to the uncertainties related to the shear wave velocity profile and the modulus reduction and damping curves. Therefore, a proper evaluation of the uncertainties in the small-strain damping evaluation should not be neglected.
Uncertainties in Small-Strain Damping Ratio Evaluation and Their Influence on Seismic Ground Response Analyses
Springer Transactions in Civil and Environmental Engineering
Sitharam, T.G. (Herausgeber:in) / Jakka, Ravi (Herausgeber:in) / Kolathayar, Sreevalsa (Herausgeber:in) / Foti, Sebastiano (Autor:in) / Aimar, Mauro (Autor:in) / Ciancimino, Andrea (Autor:in)
Latest Developments in Geotechnical Earthquake Engineering and Soil Dynamics ; Kapitel: 9 ; 175-213
02.07.2021
39 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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