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Evaluation of the Change in Friction Dampers’ Optimal Slip Load in 3-D StructuralModels Due to Soil-Structure Interaction

Tahmasebi, Ebrahim | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39559 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Rahimzadeh Rofooei, Fayyaz
  7. Abstract:
  8. In this study, the change in friction damper’s optimal slip load in 3-D structures due to soil-structure interaction was evaluated. Using AISC-LRFD code, an 8 story shear building has been designed considering gravitational and equivalent static lateral loads. Then, the changes in friction damper’s optimal slip load due to PGA and soil type variation were studied. In this part two PGAs and two soil types were considered. Seven strong ground motions, recorded on soil types E and D was used for each of the two soil types. After normalizing the PGAs of selected records, these records were used for dynamic time history analyses. In the next step, the soil-structure interaction effect has been added to the existing models using sub-structural method, and all the previous parametric analyses were repeated. In addition, comprehensive comparisons were carried out between the models including SSI effects and the models excluding SSI effects. At this point, the effect of structure’s natural period is found to be the main reason of negligible differences in the dynamic response of these two cases. In the last part of this study %10 and %20 eccentricities was introduced to the main structural model by dislocating the center of mass of stories with respect to their center of rigidity. Again, all the previous parametric studies have been repeated and the effect of SSI modeling for structures with different levels of irregularities is investigated. Although the dynamic response of the structural model with irregularity has changed dramatically in comparison to the models without eccentricity, SSI effects to the existing model did not affect the optimum slip load of pall friction dampers
  9. Keywords:
  10. Friction Damper ; Passive Control ; Soil-Structure Interaction ; Nonlinear Time History Analysis

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