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The Effect of Earthquake Vertical Component on Nonlinear Analysis of Concrete Gravity Dams Using Endurance Time Method

Zarei, Mehdi | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39994 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Esmaeilpour Estekanchi, Homayun
  7. Abstract:
  8. Study of dams' behavior and their safety against earthquakes has been interesting due to the high rate of failure. In the past, this study was just about linear analysis of dams. However, the weakness of concrete in tensile strength results in cracks in body of dams. Therefore, the nonlinear analysis of these huge structures seems to be so important. Many researches have been done in this field to model dam-reservoir-foundation with effects of concrete nonlinearity. In spite of the fact that gravity dams' safety depends on cracking status and consequently on nonlinear behavior of concrete, we cannot reach accurate and suitable results for dynamic behavior of concrete dams because these analyses results are affected by the interaction model between dam, reservoir and foundation. Thus, an approach has been introduced being able to find different operation levels. This approach is Endurance Time method. In the first step of this study, the 3D model with a unit thickness of gravity Pine Flat dam considering the interaction between dam and reservoir is built to be analyzed nonlinearly under 7 records of earthquakes and endurance time records. ET records are made artificially and their response spectrum is equal to standard spectrum of code at any time respectively. In this research, ANSYS 11.0, which is able consider effect of dam-reservoir-foundation interaction and solve couple equations at water and dam body interface, is chosen for dam analysis. In the next step, the dam with a flexible foundation (dam-reservoir-foundation interaction) is analyzed. Massless foundation method is used in this part. In each part, results of analyses due to horizontal component of earthquake are compared with results of analyses for horizontal and vertical earthquakes. Additionally, ET's results are compared with natural earthquake results.


  9. Keywords:
  10. Endurance Time Method ; Dam-Reservoir Interaction ; Concrete Gravity Dam ; Nonlinear Analysis ; Vertical Component of Earthquake Effect

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