Seismic Safety Assessment of Arch Dams Using an ETA-Based Method with Control of Tensile and Compressive Damage

Alegre, André; Oliveira, Silvia Paula De; Mendes, Paulo; Proença, Jorge; Ramos, Rafael Yus; Carvalho, Ezequiel

doi:10.3390/w14233835

Cited by 10 publications

(11 citation statements)

References 55 publications

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“…Furthermore, acceleration response spectra are depicted at three distinct time points (5, 10, and 15 s). For further insights into the concept and application of IAA in dam engineering, refer to [79][80][81][82][83]. Validation of IAA with respect to classical IDA has been discussed in [84,85].…”

Section: Problem Statement and Benchmark Descriptionmentioning

confidence: 99%

Quantifying modeling uncertainties in seismic analysis of dams: Insights from an international benchmark study

Hariri‐Ardebili

2023

Earthq Engng Struct Dyn

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Advances in nonlinear dynamic analysis of dams have not completely resolved concerns over modeling confidence and analysis accuracy. Verification and validation offer accuracy assessment, but uncertainties persist during performance evaluation due to both epistemic (modeling) and aleatory (parametric) sources. Epistemic uncertainties arise from simplifications and modeling techniques. This paper addresses epistemic uncertainties in a gravity dam seismic analysis using data from the International Comnission on Large Dams (ICOLD) benchmark study. While the benchmark formulation included the finite element model of the dam, mechanical material properties, and dynamic loads, participants retained the flexibility to opt for best‐practice modeling assumptions, simplifications, and other specifics. Notable response variability emerged, particularly in crack profiles and damage predictions. This study examines sources of variability, quantifying modeling uncertainty for the benchmark problem. More specifically, the modeling variability is quantified using the logarithmic standard deviation, also known as dispersion. This metric enables its incorporation into other seismic risk assessment and fragility studies. Under relatively low‐intensity motion (peak ground acceleration [PGA] of 0.18 g in this case), modeling dispersion of 0.45, 0.30, 0.32, and 0.30 were calculated for the maximum dynamic crest displacement, maximum hydrodynamic pressure at the heel, heel and crest maximum acceleration, respectively. Additionally, the dispersion of the failure PGA was determined to be 0.7. Findings underscore the need for systematic seismic response modeling in dam engineering to enhance prediction accuracy. A better understanding of the sources and magnitudes of modeling uncertainties can help improve the reliability of dam seismic analysis and contribute to the development of more effective risk assessment and mitigation strategies.

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Section: Problem Statement and Benchmark Descriptionmentioning

confidence: 99%

Quantifying modeling uncertainties in seismic analysis of dams: Insights from an international benchmark study

Hariri‐Ardebili

2023

Earthq Engng Struct Dyn

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“…As for seismic risk, Cabril Dam is located in the center of Portugal, integrated in a national region of high seismic risk, close to some active intraplate faults (Figure 1b). Thus, peak ground accelerations of 0.1 g (OBE) and 0.2 g (SEE) have been assumed as reference for seismic safety assessment studies [3].…”

Section: Case-study: Cabril Dam Portugalmentioning

confidence: 99%

“…The model with progressive deterioration was developed by adapting the calibrated model of the dam-reservoir-foundation system, considering a decrease in dam stiffness. This was accomplished by reducing the elasticity modulus of concrete, according to the damage variation throughout the dam body and to its progression over time; essentially, at each material point, the elasticity modulus of concrete becomes E(t) = E0(1-d(t)), where E0 is the initial value and d is the damage [8]. water levels until January 2023, and, from then on, considering a generated reservoir level variation.…”

Section: Structural Condition Assessmentmentioning

confidence: 99%

“…Finally, a study for seismic safety assessment of Cabril dam is presented, using an efficient method [3] based on Endurance Time Analysis (ETA) [11] . Specifically, the seismic performance is evaluated by controlling the evolution of the tensile and compressive damage state of the dam, under accelerations of increasing intensity.…”

Section: Seismic Safety Assessmentmentioning

confidence: 99%

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Dynamic Behavior of Cabril Dam: Finite Element Model Calibration, Structural Health Monitoring (2008–2023) and Seismic Safety Assessment

OLIVEIRA,

ALEGRE,

RAMOS

et al. 2023

Proceedings of the 14th International Workshop on Structural Health Monitoring

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This paper presents a complete study on the dynamic behavior of the 132 m high Cabril arch dam (Portugal). In operation for almost 70 years, horizontal cracks appeared on the downstream face after the first reservoir filling, and in the 1980s the dam started showing signs of concrete swelling. To address the concerns about its long-term safety, a pioneering continuous vibration monitoring system, designed for Seismic and Structural Health Monitoring, was installed in Cabril dam in 2008. In this work, the vibrations recorded under ambient/operational conditions for more than a decade are analyzed to estimate the modal parameters of the dam, which are then used to calibrate and validate a finite element model of the dam-reservoir-foundation system with the horizontal cracking. After that, the dynamic behavior of Cabril dam is simulated for the next decades, considering a computationally generated scenario of progressive damage due to concrete swelling. The results show that a) the dynamic behavior of Cabril dam is not being affected by the existing swelling phenomenon, and b) vibration-based analysis can be effective for detecting structural changes due to progressive damage. Lastly, the calibrated model is adapted for conducting non-linear seismic simulations, considering joint movements and tensile and compressive concrete damage. A method based on Endurance Time Analysis method is applied to assess the seismic safety of the dam with respect to the Operating Basis Earthquake and the Safety Evaluation Earthquake. The results confirm that Cabril dam can withstand accelerations several times greater than both earthquake levels, showing its adequate seismic capacity.

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“…Seismic loads can lead to gradual structural damage, weakening a dam’s stiffness and integrity, thus reducing its ability to withstand external loads and posing a threat to dam safety [ 7 ]. In seismic high-intensity areas, severe concrete dam accidents not only result in significant damage to the surrounding facilities but also pose a substantial threat to the life and property of downstream residents [ 8 , 9 ]. Therefore, it is necessary to study the dynamic response patterns and failure mode patterns of concrete gravity dams subjected to strong earthquakes to evaluate their seismic safety [ 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Failure Experimental Study of a Gravity Dam Model on a Shaking Table and Analysis of Its Structural Dynamic Characteristics

Qiu,

He,

Zheng

et al. 2024

Sensors

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Investigating the dynamic response patterns and failure modes of concrete gravity dams subjected to strong earthquakes is a pivotal area of research for addressing seismic safety concerns associated with gravity dam structures. Dynamic shaking table testing has proven to be a robust methodology for exploring the dynamic characteristics and failure modes of gravity dams. This paper details the dynamic test conducted on a gravity dam model on a shaking table. The emulation concrete material, featuring high density, low dynamic elastic modulus, and appropriate strength, was meticulously designed and fabricated. Integrating the shaking table conditions with the model material, a comprehensive gravity dam shaking table model test was devised to capture the dynamic response of the model under various dynamic loads. Multiple operational conditions were carefully selected for in-depth analysis. Leveraging the dynamic strain responses, the progression of damage in the gravity dam model under these diverse conditions was thoroughly examined. Subsequently, the recorded acceleration responses were utilized for identifying dynamic characteristic parameters, including the acceleration amplification factor in the time domain, acceleration response spectrum characteristics in the frequency domain, and modal parameters reflecting the inherent characteristics of the structure. To gain a comprehensive understanding, a comparative analysis was performed by aligning the observed damage development with the identified dynamic characteristic parameters, and the sensitivity of these identified parameters to different levels of damage was discussed. The findings of this study not only offer valuable insights for conducting and scrutinizing shaking table experiments on gravity dams but also serve as crucial supporting material for identifying structural dynamic characteristic parameters and validating damage diagnosis methods for gravity dam structures.

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Seismic Safety Assessment of Arch Dams Using an ETA-Based Method with Control of Tensile and Compressive Damage

Cited by 10 publications

References 55 publications

Quantifying modeling uncertainties in seismic analysis of dams: Insights from an international benchmark study

Quantifying modeling uncertainties in seismic analysis of dams: Insights from an international benchmark study

Dynamic Behavior of Cabril Dam: Finite Element Model Calibration, Structural Health Monitoring (2008–2023) and Seismic Safety Assessment

Dynamic Failure Experimental Study of a Gravity Dam Model on a Shaking Table and Analysis of Its Structural Dynamic Characteristics

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