Seismic analysis of dam-foundation-reservoir system including the effects of foundation mass and radiation damping

Mohammadnezhad, Hamid; Ghaemian, Mohsen; Noorzad, Ali

doi:10.1007/s11803-019-0499-4

Cited by 31 publications

(8 citation statements)

References 32 publications

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“…Similar studies were conducted using foundation mass and earthquake input for a concrete dam in one case, and in another, radiation damping and foundation mass were used as input to design two models (free-field boundary condition and domain reduction method) based on the FE method. Both models were found to be competent and accurate for FE modeling [129,130]. Another study tested pore water pressure in an earth dam to assess the mechanical stability using a 2D random FE method with Monte Carlo simulation [131].…”

Section: D Dam Modelingmentioning

confidence: 99%

“…The results showed that the cavitation rate, the magnitude of pressure pulsation, and performance loss increase with increasing suction head. Hydraulic turbines and types of cavitation have been described [128,129]; numerical and analytical research with theoretical studies on cavitation phenomena in hydraulic turbines have been extensively reported. Sufficient predictions for cavitation have been provided via numerical methods.…”

Section: Cavitation In the Draft Tubementioning

confidence: 99%

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State-of-the Art-Powerhouse, Dam Structure, and Turbine Operation and Vibrations

Yaseen‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬

Ameen

Aldlemy

et al. 2020

Sustainability

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Dam and powerhouse operation sustainability is a major concern from the hydraulic engineering perspective. Powerhouse operation is one of the main sources of vibrations in the dam structure and hydropower plant; thus, the evaluation of turbine performance at different water pressures is important for determining the sustainability of the dam body. Draft tube turbines run under high pressure and suffer from connection problems, such as vibrations and pressure fluctuation. Reducing the pressure fluctuation and minimizing the principal stress caused by undesired components of water in the draft tube turbine are ongoing problems that must be resolved. Here, we conducted a comprehensive review of studies performed on dams, powerhouses, and turbine vibration, focusing on the vibration of two turbine units: Kaplan and Francis turbine units. The survey covered several aspects of dam types (e.g., rock and concrete dams), powerhouse analysis, turbine vibrations, and the relationship between dam and hydropower plant sustainability and operation. The current review covers the related research on the fluid mechanism in turbine units of hydropower plants, providing a perspective on better control of vibrations. Thus, the risks and failures can be better managed and reduced, which in turn will reduce hydropower plant operation costs and simultaneously increase the economical sustainability. Several research gaps were found, and the literature was assessed to provide more insightful details on the studies surveyed. Numerous future research directions are recommended.

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Section: D Dam Modelingmentioning

confidence: 99%

Section: Cavitation In the Draft Tubementioning

confidence: 99%

State-of-the Art-Powerhouse, Dam Structure, and Turbine Operation and Vibrations

Yaseen‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬

Ameen

Aldlemy

et al. 2020

Sustainability

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show abstract

“…As it is clear, the most realistic model should include a massed foundation along with proper models of reservoir and structure. The Effects of massed foundation on the dynamic results of concrete gravity dams have been studied by many people such as Aghajanzadeh, et al [21], mohammadnezhad et al [22] and sotoudeh et al [23]. However the finite element modeling of this very important detail in the analysis is extremely complex, so, an alternative approach should be used.…”

Section: Properties and Modelingmentioning

confidence: 99%

The effect of earthquake frequency content and soil structure interaction on the seismic behavior of concrete gravity dam-foundation-reservoir system

Mohammadnezhad

Saeednezhad

Sotoudeh

2020

NMCE

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The effect of frequency content on the dynamic response of concrete gravity dams is investigated in this paper. Dams are one of the most complex structures to handle when there is dynamic analysis involved. One of the influential parameters on these structures' seismic response is the frequency content of the earthquakes. An index to represent frequency content, which represents frequency content by PGA/PGV ratio(FCI) and sets three ranges including high(FCI>1.2), intermediate(0.8

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“…Løkke and Chopra [31][32][33] employed the standard viscousdamper absorbing boundaries to model the semi-unbounded foundation and fluid domains and presented a direct finite element (FE) method for nonlinear response history analysis of 2D and 3D semi-unbounded dam-water-foundation systems. Mohammadnezhad et al [34] and Sotoudeh et al [35] developed a finite element model for earthquake analysis of a concrete gravity dam-foundation-reservoir system, where the viscous boundary condition is applied at the truncated foundation boundary to simulate the radiation damping of the semi-unbounded foundation rock. Karalar and Çavuşli [36][37][38] adopted the viscous boundary and viscoplastic material model to analyze the seismic response of the CFR dams under different reservoir water levels.…”

Section: Introductionmentioning

confidence: 99%

Influences on the Seismic Response of the Gravity Dam‐Foundation‐Reservoir System with Different Boundary and Input Models

Chen

Hou

Wang

2021

Shock and Vibration

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Dynamic dam-foundation interaction is great important in the design and safety assessment of the dam structures. Two classic boundary conditions, i.e., the viscous-spring boundary and the viscous boundary, are employed to consider the radiation damping of the unbounded rock foundation. The input models of seismic excitation of the viscous-spring boundary and the viscous boundary are derived. The accuracy of the two boundary conditions in the dynamic analysis of the dam foundation is verified through the foundation analysis using an impulsive load. The influences of two boundary conditions and their earthquake input models on the seismic analysis of the Pine Flat and Jin’anqiao gravity dam-foundation-reservoir systems are then investigated. The results of displacements, hydrodynamic pressure, and principal stresses show that the agreement between the results of the viscous-spring boundary and viscous boundary is good. The relative errors of the two models in the Pine Flat and Jin’anqiao gravity dams are both less than 5%. They are both acceptable from an engineering point of view.

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Seismic analysis of dam-foundation-reservoir system including the effects of foundation mass and radiation damping

Cited by 31 publications

References 32 publications

State-of-the Art-Powerhouse, Dam Structure, and Turbine Operation and Vibrations

State-of-the Art-Powerhouse, Dam Structure, and Turbine Operation and Vibrations

The effect of earthquake frequency content and soil structure interaction on the seismic behavior of concrete gravity dam-foundation-reservoir system

Influences on the Seismic Response of the Gravity Dam‐Foundation‐Reservoir System with Different Boundary and Input Models

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