Fragility Analysis of Concrete Gravity Dams

Ellingwood, Bruce R.; Tekie, Paulos B.

doi:10.1061/(asce)1076-0342(2001)7:2(41)

Cited by 71 publications

(37 citation statements)

References 55 publications

(88 reference statements)

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“…The focus of this study is on challenges to structural integrity of the dam due to earthquakes at or beyond this design basis. A fragility assessment of the Bluestone Dam for extreme hydrologic events in excess of the original design ood has already been performed and is reported elsewhere [8].…”

Section: Description Of Bluestone Dammentioning

confidence: 99%

“…The concrete in the monolith was modeled as an impervious material. A separate FE analysis [8] indicated that the uplift pressure can be modeled by a piecewise linear distribution, with 100% hydrostatic pressure head at the heel, with the hydrostatic pressure head measured from the oor of the drain gallery at the drains and pressure head equal to tail water elevation at the toe of the dam. If the tail water elevation is above the oor of the drain gallery, however, the hydrostatic pressure is measured using the tail water elevation as reference, as the gallery itself is ooded and under pressure greater than one atmosphere.…”

Section: Description Of Modelmentioning

confidence: 99%

“…It was shown [22] that the twoparameter model is a valid approximation when both the frequency content of the excitation and the signiÿcant natural frequencies of the dam extend over several resonant frequencies of the reservoir. Details of the implementation of this model in the FE analysis of the Bluestone Dam are presented elsewhere [8].…”

Section: Dam-water-foundation Interactionmentioning

confidence: 99%

“…Construction of fragilities for progressively more severe limit states or performance objectives portrays the robustness of dam performance subject to increasing hazard intensity [8]. Several limit states, conÿned to structural failure modes were considered in the seismic fragility analyses of the Bluestone Dam.…”

Section: Limit Statesmentioning

confidence: 99%

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Seismic fragility assessment of concrete gravity dams

Tekie

Ellingwood

2003

Earthq Engng Struct Dyn

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125

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SUMMARYMany concrete gravity dams have been in service for over 50 years, and over this period important advances in the methodologies for evaluation of natural phenomena hazards have caused the designbasis events for these dams to be revised upwards. Older existing dams may fail to meet revised safety criteria and structural rehabilitation to meet such criteria may be costly and di cult. Fragility assessment provides a tool for rational safety evaluation of existing facilities and decision-making by using a probabilistic framework to model sources of uncertainty that may impact dam performance. This paper presents a methodology for developing fragilities of concrete gravity dams to assess their performance against seismic hazards. The methodology is illustrated using the Bluestone Dam on the New River in West Virginia, which was designed in the late 1930s. The seismic fragility assessment indicated that sliding along the dam-foundation interface is likely if the dam were to be subjected to an earthquake with a magnitude of the maximum credible earthquake (MCE) speciÿed by the U.S. Army Corps of Engineers. Moreover, there will likely be tensile cracking at the neck of the dam at this level of seismic excitation. However, loss of control of the reservoir is unlikely.

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Section: Description Of Bluestone Dammentioning

confidence: 99%

Section: Description Of Modelmentioning

confidence: 99%

Section: Dam-water-foundation Interactionmentioning

confidence: 99%

Section: Limit Statesmentioning

confidence: 99%

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Seismic fragility assessment of concrete gravity dams

Tekie

Ellingwood

2003

Earthq Engng Struct Dyn

Self Cite

125

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“…However, these structures, just like human beings, are subject to damage over time that can vary in form, mode and origin. When they become aged and enter a phase of what Ellingwood and Tekie (2000), Diéz-Cascón and Bueno (2001) and Kalantarnia et al (2016) call progressive deterioration, great lengths must be taken in the regular maintenance to proactively manage the risk associated with the aging of the dams. ICOLD (2011) estimates that more than 40% of the world's dams are over 40 years old and therefore in this phase of progressive deterioration.…”

Section: Introductionmentioning

confidence: 99%

Damage Diagnosis in Concrete Dams with Presented Expansive Damage Based on Medical Propaedeutics

Pardo-Bosch

Aguado

2017

J. Perform. Constr. Facil.

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The maintenance of dams is crucial given their social, environmental and economic relevance. However, more than 40% of the world's dams are over 40 years old.Furthermore, due to their ageing, damage such as cracks, leaks and remaining movements have the potential to affect their serviceability and safety. This paper provides dam maintenance technicians with a methodology that first provides a diagnostic hypothesis, as maintenance work can only be considered if the source of the problem is known. The methodology provides technicians with tools for making decisions to ensure the short and long-term sustainable management of a fundamental resource for societies. The analysis uses a transversal approach broken into three stages: study of the structure's "clinical" history, field inspection and analysis. These tasks are described from a technical point of view with a range of examples and graphs to demonstrate their practical usefulness and to facilitate implementation.

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Seismic performance sensitivity and uncertainty analysis of gravity dams

Alembagheri

Seyedkazemi

2014

Earthq Engng Struct Dyn

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SUMMARYUncertainties in structural engineering are often arising from the modeling assumptions and errors, or from variability in input loadings. A practical approach for dealing with them is to perform sensitivity and uncertainty analysis in the framework of stochastic and probabilistic methods. These analyses can be statically and dynamically performed through nonlinear static pushover and IDA techniques, respectively. Of the existing structures, concrete gravity dams are infrastructures which may encounter many uncertainties. In this research, probabilistic analysis of the seismic performance of gravity dams is presented. The main characteristics of the nonlinear tensile behavior of mass concrete, along with the intensity of earthquake excitations are considered as random variables in the probabilistic analysis. Using the tallest non-overflow monolith of the Pine Flat gravity dam as a case study, its response under static and dynamic situations is reliably examined utilizing different combinations of parameters in the material and the seismic loading. The sensitivity analysis reveals the relative importance of each parameter independently. It will be shown that the undamaged modulus of elasticity and tensile strength of mass concrete have more significant roles on the seismic resistance of the dam than the ultimate inelastic tensile strain. In order to propagate the parametric uncertainty to the actual seismic performance of the dam, probabilistic simulation methods such as Monte Carlo simulation with Latin hypercube sampling, and approximate moment estimation techniques will be used. The final results illustrate the possibility of using a mean-parameter dam model to estimate the mean seismic performance of the dam.

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Fragility Analysis of Concrete Gravity Dams

Cited by 71 publications

References 55 publications

Seismic fragility assessment of concrete gravity dams

Seismic fragility assessment of concrete gravity dams

Damage Diagnosis in Concrete Dams with Presented Expansive Damage Based on Medical Propaedeutics

Seismic performance sensitivity and uncertainty analysis of gravity dams

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