Natural frequencies measured from ambient vibration response of the arch dam of Mauvoisin

Darbre, Georges R.; Smet, Christophe; Kraemer, C

doi:10.1002/(sici)1096-9845(200005)29:5<577::aid-eqe924>3.0.co;2-p

Cited by 74 publications

(21 citation statements)

References 4 publications

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“…Data obtained from three concrete arch dams in the Swiss Alps provide a basis to choose damping values for earthquake analysis of these dams. Ambient vibration tests led to a viscous damping ratio of approximately 2-3% in the lower vibration modes of Mauvoisin Dam [9], and similar values were obtained for the 130-meter high Punt-del-Gall Dam [3]. Forced vibration tests of Emosson Dam also resulted in approximately 2-3% damping [10], same as for Mauvoisin Dam.…”

Section: Mauvoisin Dam and Earthquake Recordssupporting

confidence: 62%

Earthquake response of arch dams to spatially varying ground motion

Chopra

Wang

2009

Earthq Engng Struct Dyn

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The response of two arch dams to spatially varying ground motions recorded during earthquakes is computed by a recently developed linear analysis procedure, which includes dam-water-foundation rock interaction effects and recognizes the semi-unbounded extent of the rock and impounded water domains. By comparing the computed and recorded responses, several issues that arise in analysis of arch dams are investigated. It is also demonstrated that spatial variations in ground motion, typically ignored in engineering practice, can have profound influence on the earthquake-induced stresses in the dam. This influence obviously depends on the degree to which ground motion varies spatially along the dam-rock interface. Thus, for the same dam, this influence could differ from one earthquake to the next, depending on the epicenter location and the focal depth of the earthquake relative to the dam site.of computed response with ambient vibration data and known concrete and rock properties, Proulx et al. [3] selected parameter values for the dam-water-foundation rock system as follows: Concrete: elastic modulus = 36 GPa, Poisson's ratio = 0.2, and unit mass = 2400 kg/m 3 ; foundation rock: elastic modulus = 72 GPa, Poisson's ratio = 0.25, and unit mass = 2500 kg/m 3 ; water: unit mass = 1000 kg/m 3 and wave velocity = 1438 m/s; and wave reflection coefficient at the reservoir and in the portion of the dam adjacent to the thrust block, consistent with what happened during the earthquake. In contrast, analyses that ignored spatial variations in ground motion were unable to identify these highly stressed regions.

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Section: Mauvoisin Dam and Earthquake Recordssupporting

confidence: 62%

Earthquake response of arch dams to spatially varying ground motion

Chopra

Wang

2009

Earthq Engng Struct Dyn

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“…The frequency-varying excitation is a typical vibration phenomenon often seen in ambient environment. For instance, the resonant frequency of an arch dam varies with the water level in it (Darbre et al, 2000), and the vibration frequency of an engine depends on its rotation speed. However, from a practical sense, the frequency drift of an ambient excitation is limited to a certain range, which we define as the input bandwidth, instead of covering a large band as frequency sweep does.…”

Section: Input-dependent Performance Study Of the Neh Under Excitatiomentioning

confidence: 99%

Input-dependent performance study of a nonlinear piezoelectric energy harvester

Deng

Wang

2016

Journal of Intelligent Material Systems and Structures

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This work reports an input-dependent performance study of a nonlinear piezoelectric energy harvester with introduced magnetic interaction. The performances of the novel harvester with two external magnet arrays (I and II) are compared. Array II that has symmetric magnetic force yields better voltage output under frequency sweep test. As such, the energy harvesting capacity with Array II is performed under two vibration inputs (I and II). Under excitation Input I with periodic varying frequency, experimental results show that the nonlinear piezoelectric harvester outperforms its linear counterpart (no magnetic interaction) at alternating input bandwidths. A 104.5% improvement of root mean square voltage output (318.2% of power output) is obtained under excitation of 0.334g (root mean square) and bandwidth of 7 Hz. No advantage is observed under Input II consisting of one principal and finite non-principal components. However, detailed study indicates that the amplitude of the principal component and the amplitude ratio of the non-principal components to the principal component in Input II are essential to maintain large-amplitude periodic motion. Our work provides useful insights into the design, characterization, and application of nonlinear energy harvesters with external magnetic forces based on a priori knowledge of input.

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“…The natural frequencies of the Mauvoisin arch dam for varying water levels were measured by the ambient test and the earthquake events [9]. The comparisons of the natural frequencies from the numerical calculation for a ¼ 0.9 with those identified from the ambient response and the Valpelline earthquake data are presented in Fig.…”

Section: Effective Damping Ratio Of Damewaterefoundation Rockmentioning

confidence: 99%

Investigation of Damping in Arch Dam–Water–Foundation Rock System of Mauvoisin Arch Dam

Wang

2013

Seismic Safety Evaluation of Concrete Dams

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Natural frequencies measured from ambient vibration response of the arch dam of Mauvoisin

Cited by 74 publications

References 4 publications

Earthquake response of arch dams to spatially varying ground motion

Earthquake response of arch dams to spatially varying ground motion

Input-dependent performance study of a nonlinear piezoelectric energy harvester

Investigation of Damping in Arch Dam–Water–Foundation Rock System of Mauvoisin Arch Dam

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