Journal ArticleDOI
Investigation of water length effects on the modal behavior of a prototype arch dam using operational and analytical modal analyses
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TLDR
In this article, the water length effects on the modal behavior of a prototype arch dam using Operational and Analytical Modal Analyses (OMA) have been investigated.Abstract:
This study determines the water length effects on the modal behavior of a prototype arch dam using Operational and Analytical Modal Analyses. Achievement of this purpose involves construction of a prototype arch dam-reservoir-foundation model under laboratory conditions. In the model, reservoir length was taken to be as much as three times the dam height. To determine the experimental dynamic characteristics of the arch dam using Operational Modal Analysis, ambient vibration tests were implemented for empty reservoir and three different reservoir water lengths. In the ambient vibration tests, the dam was vibrated by natural excitations provided from small impact effects and the response signals were measured using sensitive accelerometers. Operational Modal Analysis software process signals collected from the ambient vibration tests, and Enhanced Frequency Domain Decomposition and Stochastic Subspace Identification techniques estimated modal parameters of the dams. To validate the experimental results, 3D finite element model of the prototype arch dam was modeled by ANSYS software for empty reservoir and three different reservoir water lengths, and dynamic characteristics of each model were determined analytically. At the end of the study, experimentally and analytically identified dynamic characteristics compared to each other. Also, changes on the natural frequencies along to water length are plotted as graphs. Results suggest that reservoir water complicates the modal behavior of the arch dam significantly.read more
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Structural health monitoring of concrete dams using long-term air temperature for thermal effect simulation
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Journal ArticleDOI
Experimental evaluation of crack effects on the dynamic characteristics of a prototype arch dam using ambient vibration tests
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Zoning Elastic Modulus Inversion for High Arch Dams Based on the PSOGSA-SVM Method
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A Study on Structural Safety of Concrete Arch Dams During Construction and Operation Phases
TL;DR: In this article, a methodology is proposed for static safety evaluation of concrete arch dams during their construction and operation phases, which includes foundation modeling, stage-construction process, thermal post-cooling analysis, realistic behavior of contraction and peripheral joints, reservoir filling, and operational thermal loading.
Journal ArticleDOI
Retrofitting Effect on the Dynamic Properties of Model-Arch Dam with and without Reservoir Water Using Ambient-Vibration Test Methods
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References
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Journal ArticleDOI
Finite elements for the dynamic analysis of fluid‐solid systems
Edward L. Wilson,Mehdi Khalvati +1 more
TL;DR: In this article, the rotational constraints were introduced to eliminate the zero-energy modes of element locking and hour glass modes and a condition of optimum constraint was obtained for non-rectangular geometry.
Journal ArticleDOI
Experimental and Analytical Modal Analysis of Steel Arch Bridge
TL;DR: In this paper, the authors presented the experimental and analytical modal analysis of a steel-girder arch bridge, which was carried out by ambient vibration testing under traffic and wind-induced excitations.
Journal ArticleDOI
EMD-based stochastic subspace identification of structures from operational vibration measurements
TL;DR: In this paper, an empirical mode decomposition (EMD)-based stochastic subspace identification procedure utilizing operational vibration measurements is presented. But, the method is not suitable for nonstationary signals.
Journal ArticleDOI
Applicability of general-purpose finite element programs in solid-fluid interaction problems
TL;DR: In this article, the elasticity matrix of a general-purpose finite element program, SAPIV, is modified in such a way that it becomes possible to idealize water as a structural finite element with zero shear modulus.
Journal ArticleDOI
Earthquake analysis of arch dams including dam–water interaction, reservoir boundary absorption and foundation flexibility
Ka‐lun Fok,Anil K. Chopra +1 more
TL;DR: In this paper, the available substructure method and computer program for the steady-state, harmonic response analysis of arch dams, including the hydrodynamic effects, were extended to consider flexibility of the foundation rock and to include Fourier synthesis of harmonic responses to obtain the earthquake response.