Structural Engineering and Mechanics

  • 제37권6호
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  • Pages.593-615
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  • 2011
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  • 1225-4568(pISSN)
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  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Investigation of water length effects on the modal behavior of a prototype arch dam using operational and analytical modal analyses

  • 투고 : 2009.09.11
  • 심사 : 2010.11.17
  • 발행 : 2011.03.25
⟨ 이전 논문 다음 논문 ⟩

초록

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.

키워드

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  4. Vibration based damage identification of concrete arch dams by finite element model updating vol.13, pp.2, 2014, https://doi.org/10.12989/cac.2014.13.2.209
  5. A Study on Structural Safety of Concrete Arch Dams During Construction and Operation Phases pp.1573-1529, 2019, https://doi.org/10.1007/s10706-018-0628-2
  6. Nonlinear Seismic Assessment of Arch Dams and Investigation of Joint Behavior Using Endurance Time Analysis Method vol.39, pp.5, 2011, https://doi.org/10.1007/s13369-014-1027-5
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  10. Zoning Elastic Modulus Inversion for High Arch Dams Based on the PSOGSA-SVM Method vol.2019, pp.None, 2011, https://doi.org/10.1155/2019/7936513
  11. Wedge Movement Effects on the Nonlinear Behavior of an Arch Dam Subjected to Seismic Loading vol.22, pp.3, 2022, https://doi.org/10.1061/(asce)gm.1943-5622.0002277