Dynamic monitoring of a concrete arch dam during the first filling of the reservoir

Pereira, Sérgio; Magalhães, Filipe; Gomes, Jorge; Cunha, Álvaro; Lemos, José V.

doi:10.1016/j.engstruct.2018.07.076

Cited by 53 publications

(30 citation statements)

References 18 publications

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“…In addition, a dynamic monitoring system, comprising 20 uniaxial accelerometers, has been installed to continuously characterize its dynamic response. Results obtained during the first six months of operation, which includes the reservoir-filling phase, have clearly shown the effect of the water level on the natural frequencies [8].…”

Section: Application To Dam-reservoir Interaction Problemsmentioning

confidence: 91%

“…A research project involving a recently built arch dam in Northern Portugal is providing extensive data on the dynamic behavior of the structure. In situ measurements of the dam dynamic response were made by two methods: forced vibration tests, performed before and after filling the reservoir, and a continuous monitoring system that has been installed in the structure [7,8]. In the present paper, the results obtained with the proposed numerical model are compared with these field measurements, providing a test of its practical performance under essentially linear conditions, given the relatively low levels of vibration induced.…”

Section: Introductionmentioning

confidence: 99%

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Modelling Dam-Water Dynamic Interaction. Numerical Options and Experimental Validation

Lemos¹,

Gomes²,

Pereira³

2019

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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The safety evaluation of concrete arch dams requires validated numerical procedures capable of representing the dynamic interaction between the dam and the reservoir during a seismic event. The proposed numerical model employs a discrete element formulation, which is ultimately intended to represent the potential dynamic slip of discontinuities in the rock mass foundation. The present paper focuses on the dam-water interaction modelling, which is a key component of the dynamic response of concrete arch dams. A fluid element discretization of the reservoir domain was adopted, based on Cundall's mixed discretization technique, which provides a displacement formulation for time domain analysis. Simple validation tests confirmed the accuracy of the solution. The model was also applied to a case study involving a recently built arch dam in Northern Portugal. In situ measurements of the dam dynamic response were made by two methods: forced vibration tests, performed before and after filling the reservoir, and a continuous monitoring systems installed in the structure. These measurements provided extensive data that allowed the dynamic characterization of the concrete arch structure and the validation of the numerical model.

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Section: Application To Dam-reservoir Interaction Problemsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Modelling Dam-Water Dynamic Interaction. Numerical Options and Experimental Validation

Lemos¹,

Gomes²,

Pereira³

2019

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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“…e main weak structural surfaces, such as f2, f5, f8, f42-9, f13, f14, and f18 faults, are simulated during the meshing of foundation. In addition, topographic, stratigraphic zoning and some engineering measures such as concrete cushion, concrete plug, shear transferring tunnel, second dam, plunge pool, 6 Advances in Civil Engineering Figure 11 shows the zoning concrete of the dam body model. e high arch dam body is divided into zone A, zone B, and zone C according to the construction manual.…”

Section: Fem Simulationmentioning

confidence: 99%

“…According to the equation of finite element numerical simulation of concrete dams, the horizontal displacement of the dam crest is inversely proportional to the change of the dam body elastic modulus. Many scholars have carried out very meaningful research [2][3][4][5][6][7][8][9][10][11][12][13][14]. De Sortis and Paoliani [15] carried out the back analysis of the physical and mechanical parameters of a concrete buttress dam by establishing a mixed displacement model.…”

Section: Introductionmentioning

confidence: 99%

Zoning Elastic Modulus Inversion for High Arch Dams Based on the PSOGSA‐SVM Method

Guo

et al. 2019

Advances in Civil Engineering

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Real-time monitoring of the actual elastic modulus is essential and necessary to ensure the safe operation of arch dams. The zoning elastic modulus of a high arch dam is inversed by using deformation safety monitoring data in the operation period, based on the particle swarm optimization with gravitation search algorithm for support vector machine (PSOGSA-SVM) method. Firstly, the measured data of multipoints with a pendulum are separated to construct the initial sample training set; then, an optimal inversion model is established to reflect the complex nonlinear relationship between the mechanical parameters of the high arch dam and the deformation of measured points; finally, the PSOGSA-SVM method is used to train and dynamically update the training set so as to realize the optimization solution of the inversion model. The proposed inversion method is successfully applied to a high arch dam in China to verify its feasibility and validity. The results show that the actual elastic modulus of the dam body is much larger than the initial elastic modulus, which is beneficial to structural stability.

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“…This dam has a continuous dynamic monitoring system that was installed in December of 2015. 29 The implementation of these systems in concrete dams and other types of structures is becoming more common, in order to understand the evolution of the dynamic behavior and for health monitoring purposes. 30 Preliminary results of this monitoring system and the forced vibrations tests, and their interpretation using a simplified numerical model, were presented in.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the dynamic behavior of a concrete arch dam by means of forced vibration tests and numerical models

Gomes

Lemos

2020

Earthq Engng Struct Dyn

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The characterization of the dynamic behavior of an arch dam, and its evolution throughout the structure's lifetime, provides important data for the safety control process. Forced vibration tests remain a reliable technique for this purpose. The Baixo Sabor dam is a 123 m high arch dam recently built in Portugal. Forced vibration tests were performed before and after the reservoir filling.Two techniques for forced vibration test are compared, discrete frequency scanning, the standard methodology, and continuous frequency scanning (sine sweep), a new proposed methodology, which allowed faster results without loss of precision. For the interpretation of test results two numerical models of the dam-reservoir-foundation system were built, and calibrated with the experimental data. A good match of numerical and experimental results was obtained for the six lowest frequencies and corresponding mode shapes. K E Y W O R D Sconcrete arch dam, dam-water interaction, dynamic behavior, force vibration test, numerical models

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Dynamic monitoring of a concrete arch dam during the first filling of the reservoir

Cited by 53 publications

References 18 publications

Modelling Dam-Water Dynamic Interaction. Numerical Options and Experimental Validation

Modelling Dam-Water Dynamic Interaction. Numerical Options and Experimental Validation

Zoning Elastic Modulus Inversion for High Arch Dams Based on the PSOGSA‐SVM Method

Characterization of the dynamic behavior of a concrete arch dam by means of forced vibration tests and numerical models

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