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Assessment of the Effect of Soil-structure Interaction on the Rocking Steel Frame System Equipped with Post-tensioned Cable and Energy Dissipating Devices

Khatamifard, Behzad | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51719 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Rahimzadeh Rofouei, Fayaz
  7. Abstract:
  8. During the last few decades, the seismic codes have allowed the building structures to behave nonlinearly under the strong ground motions to dissipate the input seismic energy. That usually takes place by formation of plastic hinges in the structural elements which in turn leads to some permanent deformation, such as residual drifts, in these structural members. Repairing these damages are both time and cost consuming. Rocking frames are among the newly introduced re-centering lateral resistance systems which in combination with some dissipating devices (fuse) prevents the formation of plastic hinge in the main frame by concentrating the plastic deformation in these energy dissipating fuse, while restoring the structure through its post-tensioned cables. Various researches have been carried out in studying the applicability and the practicality of this system. Also, a large-scale shaking table test that was conducted at E-Defense in Japan showed the performance of this system in efficiently reducing the residual drifts of the building structures. On the other hand, it is understood that the soil-structure interaction could have considerable influence on the seismic response of different structural systems, especially stiff ones. In this study, the seismic response of rocking frame systems is explored taking into account the effect of the soilstructure interaction (SSI). For this purpose, a 2-D, 3 story structural model equipped with rocking frame was prepared using the OpenSees software. This model was subjected to a suite of 7 earthquake records to assess its seismic behavior. The obtained results indicate that the developed structural model experiences a lower level of inter-story drifts, while showing an increase in the floor absolute accelerations. The rocking frame system performed perfectly in re-centering the models with and without SSI effect, leaving behind negligible residual drifts. However, for the model with SSI effect, the significant decrease in inter-story drifts and increase in rigid body rotation can have a negative effect on the performance of the self-centering system
  9. Keywords:
  10. Rocking Frame System ; Self-Centering System ; Soil-Structure Interaction ; Nonlinear Modeling ; Energy Absorption

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