Probabilistic finite element analysis of concrete gravity dams

Araújo, José Milton de; Awruch, Armando Miguel

doi:10.1016/s0965-9978(98)00052-0

Cited by 42 publications

(5 citation statements)

References 29 publications

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“…7 Thus, a similar approach is followed in this article. Note that other natural hazards such as earthquake 23 and material level hazards such as structural aging 24 might be considered as well (which are not the objectives in this article). Finite element approach is used to simulate the failure response of concrete dams.…”

Section: Simplified Functionsmentioning

confidence: 99%

Analytical failure probability model for generic gravity dam classes

Hariri-Ardebili

2017

Proceedings of the Institution of Mechanical Engineers, Part O:

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Risk analysis of concrete dams and quantification of the failure probability are important tasks in dam safety assessment. The conditional probability of demand and capacity is usually estimated by numerical simulation and Monte Carlo technique. However, the estimated failure probability (or the reliability index) is dam-dependent which makes its application limited to some case studies. This article proposes an analytical failure model for generic gravity dam classes which is optimized based on large number of nonlinear finite element analyses. A hybrid parametric–probabilistic–statistical approach is used to estimate the failure probability as a function of dam size, material distributional models and external hydrological hazard. The proposed model can be used for preliminary design and evaluation of two-dimensional gravity dam models.

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Section: Simplified Functionsmentioning

confidence: 99%

Analytical failure probability model for generic gravity dam classes

Hariri-Ardebili

2017

Proceedings of the Institution of Mechanical Engineers, Part O:

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“…For the structural safety, the dynamic behavior of the dam-foundation-reservoir system should be taken into consideration and finite element analysis can be done [95]. For examining the dynamic behavior of the structure, natural frequency, mode shapes, and damping ration should be considered which can be determined by the analytical method such as the finite element model [64].…”

Section: Finite Element 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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“…One of the first probabilistic seismic assessment of existing concrete gravity dams is performed by de Araújo, J. M. and Awruch, A.M. [36], who combine aleatory uncertainties related to the record-to-record variability of ground motions and epistemic uncertainties related to the materials characteristics, by using a Monte Carlo simulation. The computational burden is reduced by modelling seismic excitation as a non-stationary stochastic process having two basic random variables, the acceleration amplitude and the phase angle.…”

Section: Seismic Fragility Assessment Of Existing Concrete Gravity Damsmentioning

confidence: 99%

Shedding Light on the Effect of Uncertainties in the Seismic Fragility Analysis of Existing Concrete Dams

2020

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The seismic risk assessment of existing concrete gravity dams is of primary importance for our society because of the fundamental role of these infrastructures in the sustainability of a country. The seismic risk assessment of dams is a challenging task due to the lack of case histories, such as gravity dams’ seismic collapses, which hinders the definition of limit states, thus making the application of any conventional safety assessment approach difficult. Numerical models are then fundamental to predict the seismic behaviour of the complex dam-soil-reservoir interacting system, even though uncertainties strongly affect the results. These uncertainties, mainly related to mechanical parameters and variability of the seismic motion, are among the reasons that, so far, prevented the performance-based earthquake engineering approach from being applied to concrete dams. This paper discusses the main issues behind the application of the performance-based earthquake engineering to existing concrete dams, with particular emphasis on the fragility analysis. After a critical review of the most relevant studies on this topic, the analysis of an Italian concrete gravity dam is presented to show the effect of epistemic uncertainties on the calculation of seismic fragility curves. Finally, practical conclusions are derived to guide professionals to the reduction of epistemic uncertainties, and to the definition of reliable numerical models.

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Probabilistic finite element analysis of concrete gravity dams

Cited by 42 publications

References 29 publications

Analytical failure probability model for generic gravity dam classes

Analytical failure probability model for generic gravity dam classes

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

Shedding Light on the Effect of Uncertainties in the Seismic Fragility Analysis of Existing Concrete Dams

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