Comparison Of Vibration Test Results For A Model And Prototype Arch Dam
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Comparison Of Vibration Test Results For A Model And Prototype Arch Dam
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Author : Roger D. Crowson
language : en
Publisher:
Release Date : 1977
Comparison Of Vibration Test Results For A Model And Prototype Arch Dam written by Roger D. Crowson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Arch dams categories.
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.
Comparison Of Vibration Test Results For A Model And Prototype Gravity Dam
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Author : C. Dean Norman
language : en
Publisher:
Release Date : 1981
Comparison Of Vibration Test Results For A Model And Prototype Gravity Dam written by C. Dean Norman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Concrete dams categories.
A 1:60-scale model of the Pine Flat concrete gravity dam was constructed and subjected to steady state forced vibration tests. Natural frequencies, mode shapes, damping, and hydrodynamic pressures were measured during these tests. These results were compared with similar results obtained in the prototype test program previously conducted. Also two-dimensional and three-dimensional finite element analyses were performed to obtain analytical values for natural frequencies and mode shapes. Model and prototype test results compared favorably with those from the three-dimensional finite element analyses. The reservoir was observed to have little effect on the natural frequencies and mode shapes of the model dam. Furthermore, it was concluded that the dynamic characteristics of the continuous three-dimensional model compared favorably with those of the prototype which was constructed in monoliths. (Author).
Selected Water Resources Abstracts
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Author :
language : en
Publisher:
Release Date : 1987
Selected Water Resources Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Hydrology categories.
List Of Publications Of The U S Army Engineer Waterways Experiment Station
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Author : U.S. Army Engineer Waterways Experiment Station
language : en
Publisher:
Release Date : 1980
List Of Publications Of The U S Army Engineer Waterways Experiment Station written by U.S. Army Engineer Waterways Experiment Station and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Hydraulic engineering categories.
Dynamic Response Characteristics Of A Model Arch Dam
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Author : Charles D. Norman
language : en
Publisher:
Release Date : 1976
Dynamic Response Characteristics Of A Model Arch Dam written by Charles D. Norman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with Concrete dams categories.
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.
Soil Structure Interaction Numerical Analysis And Modelling
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Author : J.W. Bull
language : en
Publisher: CRC Press
Release Date : 2002-11-01
Soil Structure Interaction Numerical Analysis And Modelling written by J.W. Bull and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002-11-01 with Architecture categories.
This book describes how a number of different methods of analysis and modelling, including the boundary element method, the finite element method, and a range of classical methods, are used to answer some of the questions associated with soil-structure interaction.
Selected Water Resources Abstracts
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Author :
language : en
Publisher:
Release Date : 1987
Selected Water Resources Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Water categories.
Abstract Journal In Earthquake Engineering
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Author :
language : en
Publisher:
Release Date : 1994
Abstract Journal In Earthquake Engineering written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Buildings categories.
Summary Of The Richard B Russell Concrete Dam Vibration Study
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Author : R. Stephen Wright
language : en
Publisher:
Release Date : 1988
Summary Of The Richard B Russell Concrete Dam Vibration Study written by R. Stephen Wright and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Concrete dams categories.
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.
Arch Dams
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Author : Jose O. Pedro
language : en
Publisher: Springer Science & Business Media
Release Date : 1999-11-24
Arch Dams written by Jose O. Pedro and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999-11-24 with Technology & Engineering categories.
The present volume provides a comprehensive understanding of the modern criteria, models and methods of analysis of arch dams, for normal operation conditions and under exceptional loads. This information is important for all those involved in the evaluation of the behaviour and condition of arch dams and other large structures, either for design or monitoring purpose.