Modal identification of concrete dams under natural excitation

Pereira, Sérgio; Magalhães, Filipe; Cunha, Álvaro; Moutinho, Carlos; Pacheco, João

doi:10.1007/s13349-020-00462-9

Cited by 17 publications

(3 citation statements)

References 37 publications

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“…The continuous dynamic monitoring of Baixo Sabor arch dam, in Portugal, which is being carried out by the Laboratory of Vibrations and Structural Monitoring (ViBest-FEUP) and by the National Laboratory for Civil Engineering (LNEC) is a good example of the integration of such systems in the daily monitoring activities of large dams. Despite the complexity introduced by the disadvantageous signal-to-noise ratio, the influence of significant reservoir fluctuations and the disturbances induced by the operation of nearby power plants [5], it has been possible to successfully characterize the dynamic behaviour of this structure over a period of 7 years.…”

Section: Introductionmentioning

confidence: 99%

Seven Years of Continuous Dynamic Monitoring of Baixo Sabor Dam

Pereira,

Magalhães,

Gomes

et al. 2023

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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The Baixo Sabor dam is a 123 meters high concrete arch dam located in the north of Portugal. After the performance of a forced vibration test, a quite unique experimental programme was initiated in the dam during the first filling of the reservoir, with the installation of a continuous dynamic monitoring system in December 2015. The implementation of such a system aimed to study the evolution of the dam's dynamic behaviour during the first filling, as well as to monitor its condition in the long-term through the development of vibration-based damage detection supported by robust operational modal analysis. After a description of the dam and the monitoring system, this paper presents an overview of the tools developed to perform the automated tracking of the dam's modal parameters. Finally, using the database collected during the last seven years, the long-term evolution of the dam dynamic parameters is analysed, and their seasonal fluctuations interpreted. The eventual occurrence of structural anomalies is evaluated after the minimization of the most influential operational and environmental effects on the dam, such as temperature and the reservoir water level.

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Section: Introductionmentioning

confidence: 99%

Seven Years of Continuous Dynamic Monitoring of Baixo Sabor Dam

Pereira,

Magalhães,

Gomes

et al. 2023

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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“…These systems are based on the identification of the modal properties of the most important vibration modes of the studied structures and are considered one of the most reliable monitoring procedures to be implemented in civil engineering structures, being able to operate even under very low vibration levels [3]. The modal properties of a structure are directly connected to their mass and stiffness, representing accurate indicators of their global condition.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Monitoring of a Cable-Stayed Bridge: Monitoring System and First Results

Pereira

Magalhães

Caetano

et al. 2022

Lecture Notes in Civil Engineering

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The Éric Tabarly bridge in Nantes is a 210m long cable-stayed road bridge crossing the Loire River, that was inaugurated in 2011. It is composed of a 27 m wide steel deck divided into two spans by a 57 m high steel pylon, being the main span 143m long. In the context of the European Research Project DESDEMONA (DEtection of Steel DEfects by Enhanced MONitoring and Automated procedure for self-inspection and maintenance), the bridge has been equipped with a dynamic monitoring system, constituted of 16 uniaxial accelerometers installed both on the deck and on the Pylon, with accelerations being recorded with a sampling rate of 100 Hz. This paper describes the dynamic monitoring system installed in the bridge and the results achieved during the first months of operation, including the characterization of vibration levels (maximum and effective values) as well as the automatic identification of the bridge modal properties. Finally, the effects of operational and environmental conditions on modal properties are studied.

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“…However, the size and weight of the exciter is considerable, and it is difficult to transport and install (Rainieri and Fabbrocino, 2014). It can also be done using environmental forces such as wind and flood discharge (Altunis ¸ik et al, 2016;Li et al, 2016Li et al, , 2019Li et al, , 2020Loh and Wu, 1996;Pereira et al, 2021;Sevim et al, 2012). In addition, a continuous dynamic monitoring system for arch dams has been developed (Pereira et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Structural parameter inversion of a gravity dam based on the dynamic response induced by an underwater explosion

Liu

Wang

et al. 2022

Journal of Vibration and Control

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The overall mechanical behavior of the structure of a gravity dam is comprehensively reflected by modal information included in the measured vibration response. In this study, the dynamic elastic modulus of the dam body and foundation materials were inverted via an underwater explosion, and analyzed. First, the first three main frequencies and basic mode shapes of the dam were obtained based on the acceleration response induced by the explosion. Then, the support vector regression model optimized with the particle swarm optimization algorithm was used to invert the mechanical parameters. The results indicate that the objective function that considers dominant frequency and mode shape has a greater advantage in terms of anti-noise compared to when only the dominant frequency is considered. The inverted dynamic elastic modulus is about 1.5 times that of the static elastic modulus of the corresponding material, and the calculated modal values using the inversion parameters are basically consistent with the measured values. This method provides a new way of determining the dynamic parameters of gravity dams.

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Modal identification of concrete dams under natural excitation

Cited by 17 publications

References 37 publications

Seven Years of Continuous Dynamic Monitoring of Baixo Sabor Dam

Seven Years of Continuous Dynamic Monitoring of Baixo Sabor Dam

Dynamic Monitoring of a Cable-Stayed Bridge: Monitoring System and First Results

Structural parameter inversion of a gravity dam based on the dynamic response induced by an underwater explosion

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