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The Effect of Rocking Foundation Input Motion on Inelastic Behavior of Multi Degree of Freedom Structures

Hamidi Nakhostin, Hamid Reza | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45689 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Ghannad, Mohammad Ali
  7. Abstract:
  8. Non rigidity of the soil beneath the structure, alters elastic and inelastic response of it. This effect is caused by the soil-structure interaction. The effect of soil-structure interaction is studied in two parts, Kinematic interaction and inertial interaction. Among these, kinematic interaction effects are often assumed to be negligible so that even in existing regulations it has been ignored. While the kinematic part of soil-structure interaction effect could produce a rocking input motion that might be important. In recent years, according to expanding usage of performance based design philosophy, researches on inelastic behavior of the soil-structure systems has been done which is mainly around single degree of freedom systems. Studies have been conducted also on multi degree of freedom systems which have been focused mostly on the inertial effects of soil-structure interaction. Foundation embedment reduces sway component of foundation input motion, while it can provide significant rocking motion. although researches has been conducted about kinematic interaction and Rocking foundation input motion effects on single degree of freedom structures with embedded foundations, it has not been done for multi degree of freedom structures. Therefore, in this thesis, the effect of rocking foundation input motion on seismic behavior of structures has been widely investigated through modeling various multi degree of freedom structures and their equivalent single degree of freedom models. It is concluded that rocking foundation input motion and generally the kinematic interaction effect, for structures with low embedment ratios is not very important. For structures with higher embedment ratios it could be effective which those are not conventional structures
  9. Keywords:
  10. Kinematics Interaction ; Inelastic Behavior ; Multi-Degree of Freedom Structures ; Kinematics Interaction ; Embedded Foundation ; Rocking Component

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