Seismic and Structural Health Monitoring Systems for Large Concrete Dams

Oliveira, Silvia Paula De; Alegre, André

doi:10.12783/shm2019/32396

Cited by 6 publications

(1 citation statement)

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“…With a view to address the concerns about long-term safety, Cabril dam was instrumented in 2008 with a pioneering SSHM system, developed to monitor dam behavior under ambient/operational conditions and to measure the response during seismic events [4][5][6]. The system was designed to continuously measure vibrations on the dam, using a) 16 uniaxial accelerometers to record accelerations along the upper part of the dam, 9 in the upper gallery, at el.…”

Section: Case-study: Cabril Dam Portugalmentioning

confidence: 99%

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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Section: Case-study: Cabril Dam Portugalmentioning

confidence: 99%

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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Seismic and structural health monitoring of Cabril dam. Software development for informed management

Oliveira

Alegre

2020

J Civil Struct Health Monit

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Cracks in Arch Dams: An Overview of Documented Instances

Conde,

Toledo,

Salete

2024

Applied Sciences

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It is essential to understand how failure mechanisms work in arch dams and, in particular, their most common manifestation: cracking. In this paper, the different types of cracking are explained in terms of their causes and consequences. Then, an exhaustive literature review is carried out that results in a detailed compilation of the characteristics of 38 cracked arch dams from all over the world, including crack characteristics (zone, position, dimensions and probable cause). This review is restricted to only those dams for which information on the position of the cracks or dam displacements is publicly available. As part of the review, a brief summary of key data for each dam is included, as well as a compilation of published crack diagrams. The positions of the cracks of all the dams are classified using diagrams in relation to the type of dam and the origin of the crack. Finally, the distribution of some dam parameters and crack features is analyzed by studying the relationships between them.

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Seismic and Structural Health Monitoring Systems for Large Concrete Dams

Cited by 6 publications

References 0 publications

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

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

Seismic and structural health monitoring of Cabril dam. Software development for informed management

Cracks in Arch Dams: An Overview of Documented Instances

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