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Title |
Study on the Application of Damping Ratio in the Seismic Performance Evaluation of Concrete Dams
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Authors |
오정근(Jeong-Keun Oh) ; 정영석(Yeong-Seok Jeong) ; 권민호(Minho Kwon) |
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DOI |
https://doi.org/10.11112/jksmi.2023.27.1.9 |
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Keywords |
콘크리트 댐; 감쇠비; 인공감쇠; 방사감쇠; 레일리 감쇠 Concrete dam; Damping ratio; Artificial damping; Radiation damping; Rayleigh damping |
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Abstract |
The purpose of this paper is to review the appropriateness of the application method for the value of the damping ratio suggested in thecurrent design standards and evaluation guidelines when evaluating the seismic performance of concrete dams and to suggest improvements. As a resultof the study, for the magnitude of the damping ratio in the dynamic elastic analysis, it is necessary to refer to the case of a similar dam in which themagnitude of the earthquake load is similar and the reproducibility of the damping ratio has been verified. Considering this, it is necessary to applya low damping ratio and consider adding hysteresis damping in case of nonlinear behavior. In addition, since the concrete dam body located on therock has insignificant radiation attenuation effect, it is not reasonable to increase the damping ratio of the concrete dam body to reflect the radiationdamping. Therefore, in order to evaluate the realistic seismic performance of concrete dams, it is necessary to revise the damping ratio-related contentscontained in the current dam design standards and evaluation guidelines.
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