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Effect of Foundation Flexibility on Seismic Response of Structures with Underground Stories

Torabi, Reza | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52626 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Kazemi, Mohammad Taghi
  7. Abstract:
  8. The direct technique in which response of the soil and the structure is obtained using numerical methods like finite element is not an appropriate method for seismic analysis of soil-structure interaction of buildings. For this reason, the effects of the foundation and retaining walls are considered for a building with underground floors. Interaction models include a concrete moment frame with ten stories and zero to five underground floors in which constructed on a specific soil and analyzed in FLAC software. Three types of accelerograph Tabas, El-Centro, and Luma are used for time history analysis. Indeed, for a model with a rigid foundation, a ten stories moment frame without an underground floor is used. To compare the results of the soil and the structure related to interaction models and model with rigid foundation, base shear and ultimate push of story displacements are used. Results demonstrate the effects of interaction, depending on the type of accelerograph, reduce the base shear about 15 up to 30 percentages in which is not unexpected in previous researches. It is observed that by adding underground floors, the base shear is reduced up to 60 percentages, remarkably. It should be noted that it is dependent on retaining walls stiffness and peak ground acceleration. Indeed, the effects of interaction on the maximum story displacements depending on underground floors can be variable
  9. Keywords:
  10. Soil-Structure Interaction ; Seismic Analysis ; FLAC Software ; Building Frame Modeling ; Underground Floors

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