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Comparison of Computed and Recorded Motions
Ground motions recorded at arch dams vary spatially along the dam–foundation interface. Rarely are these spatial variations in ground motion considered in earthquake analysis of arch dams, and when they are included, dam–water–interaction is usually oversimplified. The numerical model for a concrete dam should be calibrated to match its actual vibration properties. Damping in the numerical model for the dam–water–foundation system should be consistent with measured values determined from low‐amplitude motions – within the linear range of response – recorded during forced vibration tests, ambient vibration, or small earthquakes. The measured values represent the overall damping in the system, including material damping, radiation ramping, and energy loss at reservoir boundaries. Researchers have demonstrated that damping in the range of 1–2% for the dam and 1–4% for the foundation is likely to lead to an overall damping in three‐dimensional numerical models that is consistent with the measured values.
Comparison of Computed and Recorded Motions
Ground motions recorded at arch dams vary spatially along the dam–foundation interface. Rarely are these spatial variations in ground motion considered in earthquake analysis of arch dams, and when they are included, dam–water–interaction is usually oversimplified. The numerical model for a concrete dam should be calibrated to match its actual vibration properties. Damping in the numerical model for the dam–water–foundation system should be consistent with measured values determined from low‐amplitude motions – within the linear range of response – recorded during forced vibration tests, ambient vibration, or small earthquakes. The measured values represent the overall damping in the system, including material damping, radiation ramping, and energy loss at reservoir boundaries. Researchers have demonstrated that damping in the range of 1–2% for the dam and 1–4% for the foundation is likely to lead to an overall damping in three‐dimensional numerical models that is consistent with the measured values.
Comparison of Computed and Recorded Motions
Chopra, Anil K. (author)
Earthquake Engineering for Concrete Dams ; 163-176
2020-02-25
14 pages
Article/Chapter (Book)
Electronic Resource
English
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