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Seismic Rehabilitation of Irregular Steel Structures Using Friction Dampers

Babaei, Hossein | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51990 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Moghaddam, Hassan
  7. Abstract:
  8. The purpose of this study was to find the optimal position and slip force of friction dampers, for improving the seismic performance of regular and irregular steel structures and comparison of dampers final pattern of these buildings.In this regard, one to six floor regular and irregular buildings were designed. These buildings were modeled three-dimensionally in the OpenSees Software, and were subjected to horizontal components of seven far field accelerogram in order to investigate the need for their rehabilitation. The results of the time history analysis of these buildings showed that inter-story drifts exceeds the acceptance criteria which has been assumed 2.5% according to the Life Safety limit. After Retrofitting of the four sides of the structure (simultaneously) By adaptive theory, it was observed that inter-story drift of irregular buildings in all stories was limited to 2.5% and slip load and placement of the dampers have been optimized simultaneously. In the following, the dependence of the optimization algorithm on initial values, the appropriate convergence factor of buildings, the evaluation of the operation of the dampers, and irregular effect on the behavioral parameters of the structure (such as acceleration , displacement of floors, rotation of the diaphragm, etc.), were investigated. The results of the analysis show that adaptive theory independent of the initial values, has the ability to control the displacement of all buildings and limit the torsion of irregular buildings. It has also been shown that frictional dampers are quite effective in reducing the deformations of the irregular structure
  9. Keywords:
  10. Seismic Rehabilitation ; Friction Damper ; Irregular Building Steel Structures ; Adaptive Method ; Optimization ; Time History Analysis ; OpenSees Software

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