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Contribution of Different Damping Mechanisms in Equivalent Damping of Inelastic Soil-Structure Systems

Ghanbari, Zahra | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48161 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Ghannad, Mohammad Ali
  7. Abstract:
  8. The main objective of this study is to identify the contribution of different damping mechanisms in equivalent damping of inelastic soil- structure systems which can be used to reach a better estimation of inelastic soil- structure systems response using some simplified methods. This mechanisms include the material damping of soil and structure, radiation damping of soil and also the structure’s nonlinear behavior. Despite the studies have been done, even in the fixed base systems, there is not an exact prediction for the contribution rate of inherent damping and energy absorption related to nonlinear behavior in equivalent damping of system. Considering the flexibility of soil under the structure, the material damping of soil and the radiation of waves in soil media comes in. In order to determine the contribution of different mechanisms in energy absorption, a simplified model has been subjected to harmonic and earthquake excitations in which the super structure and the soil has been modeled by a bilinear behavior and a linear concentric spring-dashpot system respectively. The results show that the more the flexible soil, the less the energy contribution of the inelastic structure behavior and the more of radiation damping and soil material damping. Besides, as the structure enters into the inelastic zone, the effect of material damping of soil and structure, especially the soil radiation damping, decreases. Additionally, by increasing the aspect ratio of structure, the radiation damping decreases significantly and the inelastic structure behavior plays a more important role in equivalent linear damping
  9. Keywords:
  10. Soil-Structure Interaction ; Equivalent Linear Method ; Nonlinear Behavior ; Material Damping ; Radiation Damping ; Energy Absorption

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