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Investigating the Performance of Dual Slip Load Friction Dampers in Reducing the Seismic Response of Steel Structures

Ghorbani, Hamid Reza | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47723 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Rahimzadeh Rofooei, Fayyaz
  7. Abstract:
  8. In this research, the performance of a new friction damper with two different slip loads to improve the seismic response of steel structural models is investigated. Also, different slip loads are considered in different floors to reduce the response parameters such as story drifts, permanent story drifts, absolute floor accelerations, and base shear forces. In this regard and as the first step, three steel moment resisting frame models with 4, 8 and 12 number of stories are designed using the AISC-LRFD and ASCE 7-10 codes. Then, the effects of slip load changes of the two level friction dampers on the seismic response of the structural models were investigated and the domain of the slip loads as well as the amount of the slippage at each level to cause the most response reduction of the system is determined. For this purpose nonlinear time history dynamic analyses performed on the prepared structural models with one slip load employing 7 earthquake records that were scaled to the DBE based on ASCE 7-10 code. Using the genetic algorithm the optimal slip load was determined for each floor, as well as the effective slip load domain. Then, considering the obtained first stage slip loads, nonlinear dynamic analyses were performed utilizing the same records that are now scaled to the MCE level to compute the variation of seconde slip loads as well as the amount of slippage in the first stage and their optimom values were obtaind using again the genetic optimization procedure
  9. Keywords:
  10. Friction Damper ; Seismic Response ; Passive Control ; Nonlinear Time History Analysis ; Slip Load

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