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Comparison of Performance of Different Boundary Conditions in Numerical Analysis of Dam-Foundation Interaction
Under Dynamic Loads

Emadi Tafti, Mohsen | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40725 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Pak, Ali
  7. Abstract:
  8. In this study, the performance of different boundary conditions in dynamic analysis of embankment dams, with consideration of dam-foundation interaction, is compared. All of models are in 2D space. The behavior of dam and the foundation are assumed to be linear elastic. Dam is built of compacted clay, whereas three types of soil are considered for foundation: loose, Medium and dense sand. Direct method is used for dam-foundation interaction analysis. We used Finite Element Method (FEM) using 8-node, quadrilateral and isoparametric elements to analyse the models. The incitement is horizontal displacement with different frequencies that is applied to lower boundary of foundation. In addition, the effect of dam reservoir is neglected. The results of this study are presented in the form of figures of horizontal displacements of dam crests that are obtained for different boundary conditions around the foundation. The used boundary conditions are: simple boundary condition at near field, simple boundary condition at far field, soft layer boundary condition, viscous (Lysmer) boundary condition, free field boundary condition and infinite elements. The “free field boundary condition” is considered as the reference condition in this study. In conclusion, it is observed that in the scope of this study, the viscous boundary condition and infinit elements have a good accordance with free field boundary condition, but other boundary conditions are not always consistent with the reference boundary condition.



  9. Keywords:
  10. Dam-Foundation Interaction ; Boundary Conditions ; Finite Element Method ; Two Dimentional Dynamic Analysis ; Displacement Incitement

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