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Evaluation of the Friction Dampers Effect on Seismic Retrofit of Non-ductile Concrete Structures

Najafi, Yousef | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39155 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Golafshani, Ali Akbar
  7. Abstract:
  8. Iran plateau is situated over the Alpide-Himalaya earthquake belt. Tectonic studies indicate that this plateau has a very high density of active and recent faults; as a result, Iran is at risk of damaging earthquakes. Experience of past severe earthquakes shows previous designed structures do not have enough strength instead of real earthquake forces, therefore vulnerability study of existing structures and give a technical and economical retrofitting plan of them is required. Conventional methods of seismic rehabilitation for example using concrete shear walls or steel braces are not suitable for some buildings. Nowadays, passive control systems have been successfully used for reducing the dynamic response of structures subjected to earthquakes. This thesis investigates friction dampers effect on seismic retrofit of non-ductile reinforced concrete structures.Friction dampers have many advantages such as high energy-dissipation potential at relatively low cost and are easy to install and maintain. In this study, seismic responses of non-ductile reinforced concrete structures with and without friction damper have compared. For determination of seismic responses, nonlinear static and time history analyses have been used. Ground motions with diverse characteristics consist of far-field and near-field records are employed in nonlinear time history analyses. In addition, nonlinear static analyses have been done with using FEMA440 procedures. The results show that seismic response of retrofitted systems is reduced significantly and seismic performance level of structure elements are improved
  9. Keywords:
  10. Seismic Rehabilitation ; Friction Damper ; Nonlinear Analysis ; Seismic Performance ; Non-Ductile Concrete Structure

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