Sensitivity Analysis of Numerical Coherency Model for Rock Sites
Characterization of ground motion incoherency can significantly reduce the seismic load imposed on large scale infrastructures. Because of difficulties in developing an empirical coherency function from a site-specific dense array, it is seldom used in practice. A number of studies used numerical si...
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2025-03-01
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| author | Dongyeon Lee Yonghee Lee Hak-Sung Kim Jeong-Seon Park Duhee Park |
| author_facet | Dongyeon Lee Yonghee Lee Hak-Sung Kim Jeong-Seon Park Duhee Park |
| author_sort | Dongyeon Lee |
| collection | DOAJ |
| description | Characterization of ground motion incoherency can significantly reduce the seismic load imposed on large scale infrastructures. Because of difficulties in developing an empirical coherency function from a site-specific dense array, it is seldom used in practice. A number of studies used numerical simulations to develop generic coherency models. However, they have only been developed for idealized profiles. A comprehensive parametric study evaluating the effect of various parameters influencing the calculated coherency function has not yet been performed. We utilized the measured shear wave velocity (<i>V<sub>s</sub></i>) profile at Pinyon Flat, located in California, to perform a suite of time history analyses. This site was selected because the empirical coherency function developed here has been used as a reference model for rock sites. We performed several sensitivity studies investigating the effect of both the site spatial variability and numerical analysis parameters in order to provide a guideline for developing a coherency model from numerical simulations. The outputs were compared against the empirical coherency model to better illustrate the importance of the parameters. The coefficient of variation (CV) of <i>V<sub>s</sub></i> was revealed to be the primary parameter influencing the calculated plane-wave coherency, whereas the correlation length (CL) has a secondary influence. Site-specific convergence analyses should be performed to determine the optimum numerical parameter, including the number of analyses and depth of numerical model. Considering the importance of CV and <i>V<sub>s</sub></i>, it is recommended to perform field tests to determine site-specific values to derive numerical coherency functions. |
| format | Article |
| id | doaj-art-3aed30bf6a2d4be2a379b23a1a50ed08 |
| institution | Kabale University |
| issn | 2076-3417 |
| language | English |
| publishDate | 2025-03-01 |
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| spelling | doaj-art-3aed30bf6a2d4be2a379b23a1a50ed082025-08-20T03:43:51ZengMDPI AGApplied Sciences2076-34172025-03-01156292510.3390/app15062925Sensitivity Analysis of Numerical Coherency Model for Rock SitesDongyeon Lee0Yonghee Lee1Hak-Sung Kim2Jeong-Seon Park3Duhee Park4Department of Civil and Environmental Engineering, Hanyang University, Seoul 04763, Republic of KoreaCentral Research Institute, Korea Hydro & Nuclear Power Co., Ltd., Daejeon 34101, Republic of KoreaCentral Research Institute, Korea Hydro & Nuclear Power Co., Ltd., Daejeon 34101, Republic of KoreaCentral Research Institute, Korea Hydro & Nuclear Power Co., Ltd., Daejeon 34101, Republic of KoreaDepartment of Civil and Environmental Engineering, Hanyang University, Seoul 04763, Republic of KoreaCharacterization of ground motion incoherency can significantly reduce the seismic load imposed on large scale infrastructures. Because of difficulties in developing an empirical coherency function from a site-specific dense array, it is seldom used in practice. A number of studies used numerical simulations to develop generic coherency models. However, they have only been developed for idealized profiles. A comprehensive parametric study evaluating the effect of various parameters influencing the calculated coherency function has not yet been performed. We utilized the measured shear wave velocity (<i>V<sub>s</sub></i>) profile at Pinyon Flat, located in California, to perform a suite of time history analyses. This site was selected because the empirical coherency function developed here has been used as a reference model for rock sites. We performed several sensitivity studies investigating the effect of both the site spatial variability and numerical analysis parameters in order to provide a guideline for developing a coherency model from numerical simulations. The outputs were compared against the empirical coherency model to better illustrate the importance of the parameters. The coefficient of variation (CV) of <i>V<sub>s</sub></i> was revealed to be the primary parameter influencing the calculated plane-wave coherency, whereas the correlation length (CL) has a secondary influence. Site-specific convergence analyses should be performed to determine the optimum numerical parameter, including the number of analyses and depth of numerical model. Considering the importance of CV and <i>V<sub>s</sub></i>, it is recommended to perform field tests to determine site-specific values to derive numerical coherency functions.https://www.mdpi.com/2076-3417/15/6/2925spatial variabilitycoherency modelhard rock sitenumerical simulationplane-wave coherency |
| spellingShingle | Dongyeon Lee Yonghee Lee Hak-Sung Kim Jeong-Seon Park Duhee Park Sensitivity Analysis of Numerical Coherency Model for Rock Sites Applied Sciences spatial variability coherency model hard rock site numerical simulation plane-wave coherency |
| title | Sensitivity Analysis of Numerical Coherency Model for Rock Sites |
| title_full | Sensitivity Analysis of Numerical Coherency Model for Rock Sites |
| title_fullStr | Sensitivity Analysis of Numerical Coherency Model for Rock Sites |
| title_full_unstemmed | Sensitivity Analysis of Numerical Coherency Model for Rock Sites |
| title_short | Sensitivity Analysis of Numerical Coherency Model for Rock Sites |
| title_sort | sensitivity analysis of numerical coherency model for rock sites |
| topic | spatial variability coherency model hard rock site numerical simulation plane-wave coherency |
| url | https://www.mdpi.com/2076-3417/15/6/2925 |
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