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Vibration Characteristics Of The North Fork Dam Model
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Book Synopsis Vibration Characteristics of the North Fork Dam Model by : Jimmy P. Balsara
Download or read book Vibration Characteristics of the North Fork Dam Model written by Jimmy P. Balsara and published by . This book was released on 1974 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).
Book Synopsis Dynamic Response Characteristics of a Model Arch Dam by : Charles D. Norman
Download or read book Dynamic Response Characteristics of a Model Arch Dam written by Charles D. Norman and published by . This book was released on 1976 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Comparison of Vibration Test Results for a Model and Prototype Arch Dam by : Roger D. Crowson
Download or read book Comparison of Vibration Test Results for a Model and Prototype Arch Dam written by Roger D. Crowson and published by . This book was released on 1977 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis An International Survey of Shock and Vibration Technology by : Henry C. Pusey
Download or read book An International Survey of Shock and Vibration Technology written by Henry C. Pusey and published by . This book was released on 1979 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NBS Special Publication written by and published by . This book was released on 1977 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :United States-Japan Cooperative Program in Natural Resources. Panel on Wind and Seismic Effects Publisher : ISBN 13 : Total Pages :636 pages Book Rating :4.3/5 (91 download)
Book Synopsis Wind and Seismic Effects by : United States-Japan Cooperative Program in Natural Resources. Panel on Wind and Seismic Effects
Download or read book Wind and Seismic Effects written by United States-Japan Cooperative Program in Natural Resources. Panel on Wind and Seismic Effects and published by . This book was released on 1977 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis List of Publications of the U.S. Army Engineer Waterways Experiment Station by : U.S. Army Engineer Waterways Experiment Station
Download or read book List of Publications of the U.S. Army Engineer Waterways Experiment Station written by U.S. Army Engineer Waterways Experiment Station and published by . This book was released on 1976 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis List of Publications of the U.S. Army Engineers Waterway Experiment Station by : United States. Army. Corps of Engineers
Download or read book List of Publications of the U.S. Army Engineers Waterway Experiment Station written by United States. Army. Corps of Engineers and published by . This book was released on 1976 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Forced Vibration Tests by : Roy M. Stephen
Download or read book Forced Vibration Tests written by Roy M. Stephen and published by . This book was released on 1975 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Selected Water Resources Abstracts by :
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1978 with total page 1064 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1948 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :University of California, Berkeley. Earthquake Engineering Research Center. Library Publisher : ISBN 13 : Total Pages :620 pages Book Rating :4.F/5 ( download)
Book Synopsis Printed Catalog by : University of California, Berkeley. Earthquake Engineering Research Center. Library
Download or read book Printed Catalog written by University of California, Berkeley. Earthquake Engineering Research Center. Library and published by . This book was released on 1975 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book National Union Catalog written by and published by . This book was released on with total page 1032 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes entries for maps and atlases.
Book Synopsis Government Reports Announcements by :
Download or read book Government Reports Announcements written by and published by . This book was released on 1974-05 with total page 900 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1992-07 with total page 558 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis International Water Power & Dam Construction by :
Download or read book International Water Power & Dam Construction written by and published by . This book was released on 1976 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Directory of Computer Software Applications by :
Download or read book A Directory of Computer Software Applications written by and published by . This book was released on with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
