Vibration Characteristics Of The North Fork Dam Model PDF Download
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Author | : Jimmy P. Balsara |
Publisher | : |
Total Pages | : 94 |
Release | : 1974 |
Genre | : Dams |
ISBN | : |
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Vibration tests were conducted on a 1/24-scale model of the North Fork Dam, a double curvature arch dam, to determine natural frequencies, mode shapes, and damping ratios. The measured results were compared with results calculated using a linear elastic three-dimensional finite element method. The objective of the study was to evaluate the use of physical models and three-dimensional finite element methods for earthquake response predictions. Mode shapes, frequencies, and damping ratios were determined from vibration tests of the model using two vibrators mounted on the crest of the dam and from tests with a vibrator mounted at the base of the dam on the downstream foundation. The modal analysis of the dam was performed using a three-dimensional finite element computer program, the Structural Analysis Program. The dam was modeled with 110 solid elements and 278 nodes and with the boundary totally fixed at the canyon walls. The reservoir was assumed to exert a static water pressure on the dam. This load, the mass of the vibrators, and an apparent mass based on an approximation by Westergaard to account for the mobilized water were included in the analysis. The Rayleigh-Ritz technique was used to determine mode shapes and frequencies. (Modified author abstract).
Author | : Jimmy P. Balsara |
Publisher | : |
Total Pages | : 4 |
Release | : 1973 |
Genre | : Arch dams |
ISBN | : |
Download Vibration Tests of North Fork Dam Model Book in PDF, ePub and Kindle
Author | : University of California, Berkeley. Earthquake Engineering Research Center. Library |
Publisher | : |
Total Pages | : 620 |
Release | : 1975 |
Genre | : Buildings |
ISBN | : |
Download Earthquake Engineering Research Center Library Printed Catalog Book in PDF, ePub and Kindle
Author | : U.S. Army Engineer Waterways Experiment Station |
Publisher | : |
Total Pages | : 430 |
Release | : 1976 |
Genre | : Hydraulic engineering |
ISBN | : |
Download List of Publications of the U.S. Army Engineer Waterways Experiment Station Book in PDF, ePub and Kindle
Author | : Roger D. Crowson |
Publisher | : |
Total Pages | : 58 |
Release | : 1977 |
Genre | : Arch dams |
ISBN | : |
Download Comparison of Vibration Test Results for a Model and Prototype Arch Dam Book in PDF, ePub and Kindle
Vibration tests were conducted on both the prototype and a 1:24-scale model of the North Fork Dam, a double curvature arch dam, to determine natural frequencies, mode shapes, damping ratios, and hydrodynamic pressures. Two vibrators mounted on the crest of the dam were used as input excitation sources for both series of tests. Electromagnetic shakers capable of a 40-lb output were used in the model tests, while counterrotating, eccentric mass exciters capable of a 5000-lb output were employed for the prototype. Velocities were measured along the crest and downstream face of the model, whereas accelerations were measured in the same locations on the prototype. Measurements in both curves were taken at the dam-reservoir interface while the structures were excited at resonant frequencies. Damping in both model and prototype ranged from approximately 2 to 5 percent of critical. These values are consistent with structural damping values for these types of structures.
Author | : Henry C. Pusey |
Publisher | : |
Total Pages | : 476 |
Release | : 1979 |
Genre | : Shock (Mechanics) |
ISBN | : |
Download An International Survey of Shock and Vibration Technology Book in PDF, ePub and Kindle
Author | : Charles D. Norman |
Publisher | : |
Total Pages | : 54 |
Release | : 1976 |
Genre | : Concrete dams |
ISBN | : |
Download Dynamic Response Characteristics of a Model Arch Dam Book in PDF, ePub and Kindle
Vibration tests were conducted on a 1:24-scale model of the North Fork Dam (Near Auburn, Calif.), a double-curvature arch dam, to determine natural frequencies, mode shapes, and hydrodynamic pressures. The mode shapes, natural frequencies, and hydrodynamic pressures were determined from tests using two-vibrators mounted on the crest of the dam. Hydrodynamic pressures at the dam-reservoir interface were also determined from tests in which the vibrator was attached to the downstream foundation of the dam. The hydrodynamic pressures calculated using Westergaard;s theory and a theory for arch dams developed by Perumalswami and Kar accurately predicted the measured pressure at frequencies below the first mode frequency of the dam. The differences in the two theories were insignificant. The accuracy of the Ritz analysis improved considerably as more nodes in flexible regions of the dam were loaded. However, the lowest eigenvalues were computed using the subspace iteration method. For the full reservoir, the natural frequencies decreased by 20-30% when the foundation was included in the finite element model. The difference was less when the reservoir was empty. The calculations using the subspace iteration scheme and including the foundation agreed closely with experimental mode shapes and corresponding natural frequencies.
Author | : |
Publisher | : |
Total Pages | : 640 |
Release | : 1977 |
Genre | : Weights and measures |
ISBN | : |
Download NBS Special Publication Book in PDF, ePub and Kindle
Author | : United States-Japan Cooperative Program in Natural Resources. Panel on Wind and Seismic Effects |
Publisher | : |
Total Pages | : 636 |
Release | : 1977 |
Genre | : Buildings |
ISBN | : |
Download Wind and Seismic Effects Book in PDF, ePub and Kindle
Author | : United States. Army. Corps of Engineers |
Publisher | : |
Total Pages | : 438 |
Release | : 1976 |
Genre | : |
ISBN | : |
Download List of Publications of the U.S. Army Engineers Waterway Experiment Station Book in PDF, ePub and Kindle