Seismic Risk Analysis of Concrete Gravity Dams under Near-Fault Ground Motions

Hebbouche, Abdelhamid; Bensaibi, Mahmoud; Mroueh, Hussein

doi:10.4028/www.scientific.net/amm.256-259.2240

Cited by 9 publications

(6 citation statements)

References 8 publications

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“…These parameters are reported in table 2 which shows the six modeling parameters considered in this study and their associated probability density functions. Seismic hazard in terms of spectral acceleration has been estimated based on the previous studies related to the site of northern Algeria [1,5,8,15]. The main parameters considered for the choice of these recordings are magnitude, epicentral distance, peak ground acceleration (PGA) and peak ground velocity (PGV).…”

Section: Resultsmentioning

confidence: 99%

“…Contrary, a vulnerable structure (or system) represents serious disadvantages on terms related to security and costs. The concepts of reliability and vulnerability are both associated to ensure the functioning of critical systems and increase their security level, and their determination is necessary to prevent future potentially destructive actions [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…Various previous works have mentioned the importance of each of these concepts separately [1][2][3][4][5][6][7][8], but recent researches demonstrate that both concepts should be taken simultaneously into account to improve characteristics and security level of structural systems [9][10][11][12][13]. So, it is very important to determinate how to use the reliability and vulnerability analyses for making decisions on critical infrastructures or structures.…”

Section: Introductionmentioning

confidence: 99%

“…Concrete structure can be affected by seismic loads and earthquake effects. Moreover, damages provoked under these risks to this structure, especially to the dams, can increase the extent of the potentially catastrophic consequences in terms environmental, economic and of human lives losses [1,5]. In this context, several approaches can be used; one uses either the deterministic approach, or the semi-probabilistic approach or then the probabilistic approach [14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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Performances evaluation of a hydraulic structure using the reliability methods

Hebbouche¹,

Belheouan²,

Bennoud³

2020

IJM

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The exploitation of the structures (planes, engines) and of the infrastructures (dams, nuclear thermal power stations) with a very high cost of realization and a significant working life must be done with a risk of damages and failures reduced and controlled. This paper proposes a case study for the risk assessment of a hydraulic structure under random contingencies effects by using reliability and vulnerability measures. The reliability which can be defined as the probability that the system will remain in a non-failure state, and vulnerability which represents the system's susceptibility to failure have been investigated in this paper. Our study provides a helpful approach for an effective utilization and combination of reliability and vulnerability indices to improve the functioning and security, and to take an adequate decision on the system state.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Performances evaluation of a hydraulic structure using the reliability methods

Hebbouche¹,

Belheouan²,

Bennoud³

2020

IJM

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“…Hebbouche et al [42] adopt the procedure proposed by Tekie and Ellingwood to consider both epistemic and aleatory uncertainties in the fragility calculation. The authors assume a linear behaviour for the dam body, while the soil is modelled as perfectly plastic material with Mohr-Coulomb yield criterion.…”

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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Introduction

Xu,

Pang

2024

Hydroscience and Engineering

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This paper provides a complete probabilistic analysis method and a performance-based seismic safety evaluation for high concrete faced rockfill dam (CFRD). Combined with random sample generation and reliability analysis methods, the dynamic response characteristics and reliability level of CFRD under various random factors are comprehensively described. In Chapter 2, a random ground motion model based on spectral representation-random function and a high-dimensional random variable generation method based on GF-discrepancy are established. Combined with probability density evolution method (PDEM) and the random sample generation methods to verify its effectiveness and reliability for nonlinear complex geotechnical engineering. In Chapter 3, the dynamic response and probabilistic characteristics of high CFRD under random ground motion are revealed based on the elastoplastic analysis. A performance-based seismic safety evaluation method is established. In Chapter 4, the influence of material parameter randomness on dynamic response and seismic safety of high CFRD is studied from the perspective of stochastic dynamics and probability. In Chapter 5, the stochastic dynamic response and probability distribution of high CFRD under the coupled random action of ground motion and material parameters are systematically studied, and the performance-based seismic safety evaluation framework is improved. In Chapter 6, The stochastic dynamic response of 3D high CFRD is studied, and the failure performance index and performance level based on overstress volume ratio combined with overstress accumulation time are discussed. The performance-based seismic safety evaluation framework is further improved. In Chapter 7, combined with the finite element dynamic time-history analysis method considering the softening effect of rockfill, a performance-based seismic safety evaluation framework for dam slope stability of high CFRD under multiple random factors is systematically explored from the perspective of stochastic dynamics and probability. In Chapter 8, The performance indexes of seismic safety evaluation for high CFRDs are suggested and the corresponding performance level with probability assurance is put forward. The multi-seismic intensity—multi-performance target—failure probability performance relationship is established, and a performance-based seismic safety evaluation framework is initially formed. This book can be used as a reference for scholars studying random vibration and reliability analysis, as well as for scholars studying dam safety evaluation.

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Seismic Risk Analysis of Concrete Gravity Dams under Near-Fault Ground Motions

Cited by 9 publications

References 8 publications

Performances evaluation of a hydraulic structure using the reliability methods

Performances evaluation of a hydraulic structure using the reliability methods

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

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