Current Methods Of Dynamic Analysis For Seismic Stability Of Earth Dams
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Current Methods Of Dynamic Analysis For Seismic Stability Of Earth Dams
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Author : William Frederick Marcuson
language : en
Publisher:
Release Date : 1980
Current Methods Of Dynamic Analysis For Seismic Stability Of Earth Dams written by William Frederick Marcuson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Earth dams categories.
Current United States Practice For Numerical Analysis Of Dams
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Author :
language : en
Publisher:
Release Date : 1985
Current United States Practice For Numerical Analysis Of Dams written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Concrete dams categories.
Seismic Design Analysis And Remedial Measures To Improve Stability Of Existing Earth Dams
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Author : William Frederick Marcuson
language : en
Publisher:
Release Date : 1983
Seismic Design Analysis And Remedial Measures To Improve Stability Of Existing Earth Dams written by William Frederick Marcuson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with Dam safety categories.
This report discusses the seismic design of new embankment dams and analysis of existing dams, and possible courses of action to mitigate seismic hazards in the event that analysis indicates unsatisfactory conditions. Also discussed are the use of pseudostatic stability analysis and appropriate seismic coefficients. Several courses of action to deal with unsatisfactory conditions have been identified as being potentially feasible. These actions are designed either to reduce the risk of failure or to assure that the consequences will be tolerable should a damaging earthquake occur near an existing dam judged susceptible to earthquake-induced liquefaction. An essential condition is that the accomplishment and the effects of the proposed remedial work be verifiable. Courses of action discussed include (a) no action, (b) regulation to public access downstream, (c) partial lowering of the pool, (d) permanent emptying of the reservoir, (e) in situ densification of the foundation, (f) surcharge, (g) dewattering, (h) reduction in the drainage paths, (i) grouting, (j) construction of a replacement structure, (k) replacement in a new location, and (l) construction of a detention dam.
Response And Stability Of Earth Dams During Strong Earthquakes
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Author : S. K. Sarma
language : en
Publisher:
Release Date : 1979
Response And Stability Of Earth Dams During Strong Earthquakes written by S. K. Sarma and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with categories.
This earth dam study considers the response of an earth dam resting on a layer underlain by a rigid base and subjected to a strong ground motion. The dam and the layer are assumed to be elastic, homogeneous, and of simple geometric form. The properties of the dam and the layer may be different. Several combinations of the properties of the dam and the layer, as well as several ratios of the height of the dam to the depth of the layer, are studied. All of these are subjected to nine strong motion acceleration recrods, and their response is calculated. At the same time, seismic coefficients for various sizes of sliding wedges are computed. The results of individual cases and their envelopes are presented in the spectral form for design purposes. Methods of stability analysis for static and pseudostatic conditions are examined, and two new methods are presented. One of these methods is suitable for analyzing existing slip surfaces, and the other for quick computation of the critical acceleration for a given surface. Since pore water pressure developed in the dam during an earthquake is an important factor, a method of stability analysis is developed that takes the excess dynamic pore water pressure into account. The method is based on limit equilibrium principle. Pore water pressures are introduced in the form of dynamic parameter A sub n. The result is obtained in the form of a critical acceleration required to cause failure as a function of the number of cycles of earthquake load.
Earthquake Engineering For Concrete Dams
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Author : Anil K. Chopra
language : en
Publisher: John Wiley & Sons
Release Date : 2020-03-16
Earthquake Engineering For Concrete Dams written by Anil K. Chopra and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-03-16 with Technology & Engineering categories.
A comprehensive guide to modern-day methods for earthquake engineering of concrete dams Earthquake analysis and design of concrete dams has progressed from static force methods based on seismic coefficients to modern procedures that are based on the dynamics of dam–water–foundation systems. Earthquake Engineering for Concrete Dams offers a comprehensive, integrated view of this progress over the last fifty years. The book offers an understanding of the limitations of the various methods of dynamic analysis used in practice and develops modern methods that overcome these limitations. This important book: Develops procedures for dynamic analysis of two-dimensional and three-dimensional models of concrete dams Identifies system parameters that influence their response Demonstrates the effects of dam–water–foundation interaction on earthquake response Identifies factors that must be included in earthquake analysis of concrete dams Examines design earthquakes as defined by various regulatory bodies and organizations Presents modern methods for establishing design spectra and selecting ground motions Illustrates application of dynamic analysis procedures to the design of new dams and safety evaluation of existing dams. Written for graduate students, researchers, and professional engineers, Earthquake Engineering for Concrete Dams offers a comprehensive view of the current procedures and methods for seismic analysis, design, and safety evaluation of concrete dams.
Embankment Dams
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Author : United States. Bureau of Reclamation
language : en
Publisher:
Release Date : 1984
Embankment Dams written by United States. Bureau of Reclamation and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with Dams categories.
A Comprehensive Seismic Response And Slope Stability Analysis Framework For Evaluating The Stability Of Hydraulic Fill Dams
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Author : Sayantan Chakraborty (Ph.D.)
language : en
Publisher:
Release Date : 2020
A Comprehensive Seismic Response And Slope Stability Analysis Framework For Evaluating The Stability Of Hydraulic Fill Dams written by Sayantan Chakraborty (Ph.D.) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with Earth dams categories.
The stability and serviceability of earthen embankment structures such as dams and levees are extremely crucial to avoid the catastrophic consequences of the failure of these structures. Such man-made geo-structures are usually stable under normal working conditions; however, the stability and subsequent functionality may be affected during earthquake events. Hence, the evaluation of seismic response and structural stability of earthen dams is an important facet in the field of geotechnical earthquake engineering. Dams and levees built in earthquake-prone regions are usually designed to withstand expected seismic events, and in-depth time-history based dynamic analyses are typically performed to assess the behavior of these structures during earthquakes. However, earthen dams located in regions of newly declared induced-seismicity, like Texas, may not have been specifically designed to withstand these dynamic excitations. Hence, it is imperative to evaluate the performance of dams and levees located in such zones of induced seismicity. In this study, the stability of the Eagle Mountain dam, an 85-year-old hydraulic-fill dam, located in Fort Worth, Texas, is evaluated. Historical evidence concerning the poor performance of hydraulic-fill dams around the world during earthquake events further necessitates the assessment of seismic stability of the Eagle Mountain dam. Moreover, there is an inherent variability associated with the material properties along the body of the dam due to the hydraulic-fill method of construction that is not often captured in the traditional method of analysis. In this research, a framework is developed to study the seismic response and stability of hydraulic-fill dams incorporating the effect of material variability and induced seismicity. Three-dimensional models of the dam, depicting the variations indifferent shear strength properties, were developed by interpolating the in-situ test results using geostatistics-based kriging analysis. These models along with additional available bore log information were used to assign the material properties to the finite-element models of the dam.In the absence of earthquake time-history data recorded at the dam site, a new natural-frequency-based approach was devised to select the acceleration-time data required for the analysis. A novel method was also developed to determine the strain-dependent natural frequency of the earthen embankment structures. To comprehensively characterize the performance of the dam in the event of probable earthquakes, a broad spectrum of earthquake data having varying peak accelerations and frequency contents were selected. Extensive stability analyses, including static, pseudo-static, Newmark deformation, and dynamic analyses, were performed to identify the critical sections of the dam. A reliability-based pseudostatic analysis and a sensitivity analysis were also performed to gauge the effect of uncertainty associated with the estimation of the strength parameters and small strain shear modulus of subsurface layers, respectively.Results indicate that the dam is safe under static conditions and during earthquakes with peak ground accelerations (PGA) of 0.02g, similar to what the dam has already experienced in the past. Moreover, the dam is expected to be safe during earthquakes with PGA less than 0.09 g, provided that the predominant frequency of the earthquake is not close to the natural frequency of the dam. Some parts of the upstream shell and foundation sand layers, especially near the toe of the dam, may liquefy. However, flow liquefaction of the foundation sand layers is not expected to happen. The middle portion of the dam, from stations 14.5 to 27,were found to be the most critical, based on the results of the pseudo-static and dynamic analyses.
Seismic Design Analysis And Remedial Measures To Improve Stability Of Existing Earth Dams
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Author : William Frederick Marcuson
language : en
Publisher:
Release Date : 1983
Seismic Design Analysis And Remedial Measures To Improve Stability Of Existing Earth Dams written by William Frederick Marcuson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with Dam safety categories.
This report discusses the seismic design of new embankment dams and analysis of existing dams, and possible courses of action to mitigate seismic hazards in the event that analysis indicates unsatisfactory conditions. Also discussed are the use of pseudostatic stability analysis and appropriate seismic coefficients. Several courses of action to deal with unsatisfactory conditions have been identified as being potentially feasible. These actions are designed either to reduce the risk of failure or to assure that the consequences will be tolerable should a damaging earthquake occur near an existing dam judged susceptible to earthquake-induced liquefaction. An essential condition is that the accomplishment and the effects of the proposed remedial work be verifiable. Courses of action discussed include (a) no action, (b) regulation to public access downstream, (c) partial lowering of the pool, (d) permanent emptying of the reservoir, (e) in situ densification of the foundation, (f) surcharge, (g) dewattering, (h) reduction in the drainage paths, (i) grouting, (j) construction of a replacement structure, (k) replacement in a new location, and (l) construction of a detention dam.
Three Dimensional Dynamic Response Analysis Of Earth Dams
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Author : Lelio H. Mejia
language : en
Publisher:
Release Date : 1981
Three Dimensional Dynamic Response Analysis Of Earth Dams written by Lelio H. Mejia and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Dams categories.
Seismic Stability Problems In Earth Dam Design
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Author : Bahram Khamenehpour
language : en
Publisher:
Release Date : 1983
Seismic Stability Problems In Earth Dam Design written by Bahram Khamenehpour and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with categories.