Summary of the Richard B. Russell Concrete Dam Vibration Study.
Final rept. Sep 81-Sep 87,
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
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Linear elastic three-dimensional finite element FE analyses of a concrete gravity dam modeled both with and without reservoir effects were conducted to determine natural frequencies and mode shapes of the dam. These analyses were compared with experimental results from prototype vibration tests before and after reservoir impoundment. Mode shapes comparisons between the prototype and the FE model results were evaluated using a modal assurance criterion. Flexible and rigid foundation models were used in the analyses, and the reservoir was modeled as added mass to the dam. The comparison of analytical of experimental results provided a basis for assessing the accuracy of liner elastic FE models for predicting dynamic properties of concrete gravity dams. The correlation between experimental and FE mode shapes was the most favorable for the case of the dam without reservoir using a fixed foundation. Analytical estimates of natural frequencies were higher than those actually measured by experiment. The Fe model with flexible foundation gave estimates closest to the frequencies determined by the experiment.
- Civil Engineering