Assessment of Foundation Mass and Earthquake Input Mechanism Effect on Dam–Reservoir–Foundation System Response

Ghaemian, Mohsen; Noorzad, Ali; Mohammadnezhad, Hamid

doi:10.1007/s40999-018-0325-9

Cited by 13 publications

(6 citation statements)

References 10 publications

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“…Ghaemian et al [3] compared the relative crest displacement and principal stress of the 103 m high Koyna concrete gravity dam between rigid, massless, and massed foundation models, and concluded that the massless foundation input model overestimated the dam dynamic response. Salamon et al [4] compared the dam horizontal acceleration responses between the massless foundation model and the massed foundation model.…”

Section: Introductionmentioning

confidence: 99%

Influences on the Seismic Response of a Gravity Dam with Different Foundation and Reservoir Modeling Assumptions

Wang

Zhang²,

Zhang

et al. 2021

Water

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The seismic design and dynamic analysis of high concrete gravity dams is a challenge due to the dams’ high levels of designed seismic intensity, dam height, and water pressure. In this study, the rigid, massless, and viscoelastic artificial boundary foundation models were established to consider the effect of dam–foundation dynamic interaction on the dynamic responses of the dam. Three reservoir water simulation methods, namely, the Westergaard added mass method, and incompressible and compressible potential fluid methods, were used to account for the effect of hydrodynamic pressure on the dynamic characteristics and seismic responses of the dam. The ranges of the truncation boundary of the foundation and reservoir in numerical analysis were further investigated. The research results showed that the viscoelastic artificial boundary foundation was more efficient than the massless foundation in the simulation of the radiation damping effect of the far-field foundation. It was found that a foundation size of 3 times the dam height was the most reasonable range of the truncation boundary of the foundation. The dynamic interaction of the reservoir foundation had a significant influence on the dam stress.

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Section: Introductionmentioning

confidence: 99%

Influences on the Seismic Response of a Gravity Dam with Different Foundation and Reservoir Modeling Assumptions

Wang

Zhang²,

Zhang

et al. 2021

Water

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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%

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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“…The response of the dam under seismic analysis considering the dam-reservoir-foundation effect is done by numerous researchers to assess the dynamic responses [2,3,4,5]. Various researchers in the past have used the ANSYS tool to analyze the 2-D gravity dam under static and dynamic loads, few works related to nite element analysis of dams are presented from the available literature.…”

Section: Introductionmentioning

confidence: 99%

Static and free vibration analysis of gravity dam under the influence of hydrostatic pressure using ANSYS finite element models

name¹,

Vipparthy

2022

Preprint

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Dams are considered to be very important structures as they play an important role in the economic and social development of the area in which it is being constructed as well as utilized for hydropower generation. The concrete gravity dam is a solid structure that retains its stability against the design loads through its self-weight alone. The dam considered in this study is a structure of the Indirasagar polavaram gravity dam which is located in the village called Ramayyapeta comes under the West Godavari District, Andhra Pradesh. In this study, the finite element (FE) method is employed to numerically analyze the 2-D concrete gravity dam. The main objective of this study is to perform a linear FE analysis of the Indirasagar Polavaram gravity dam by varying the upstream hydrostatic pressure with constant downstream tailwater pressure. In the static analysis parameters like displacements, stresses and strains are assessed at each node, and their corresponding distributions are noticed. Subsequently, in the dynamic analysis approach, only free vibration analysis (Modal analysis) is done by considering only the dam's weight, the first five-mode shapes and their respective natural frequencies are extracted using ANSYS. The linear material behavior of the dam is modeled using the quadrilateral 4 node PLANE182 elements and the hydrostatic pressure is applied as triangular distribution. From the numerical analysis, it is concluded that the maximum tensile stresses are accumulated at the heel portion of the dam for cases 1 to 4, whereas it is observed distributed along the dam base for the rest of the cases. The lateral displacement and strain are observed maximum for case 1. The First mode's natural frequency of 5.81 Hz is ascertained and the maximum frequency and displacement are produced under the fifth mode.

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Assessment of Foundation Mass and Earthquake Input Mechanism Effect on Dam–Reservoir–Foundation System Response

Cited by 13 publications

References 10 publications

Influences on the Seismic Response of a Gravity Dam with Different Foundation and Reservoir Modeling Assumptions

Influences on the Seismic Response of a Gravity Dam with Different Foundation and Reservoir Modeling Assumptions

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

Static and free vibration analysis of gravity dam under the influence of hydrostatic pressure using ANSYS finite element models

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