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Experimental and Numerical Modeling of Telescopic Damper

Pournamazian Najafabadi, Esmaeil | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49309 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Eskandari, Morteza
  7. Abstract:
  8. This study proposes a new metallic yielding damper for seismic applications. First, considering the damper proposed by curadelli in 2009 a simple lead yielding damper was manufactured to determine its maximum allowable axial deformation showing that it cannot tolerate suitable axial deformations. To solve this problem a telescopic damper with curadelli damper’s descriptions was manufactured and tested which increased the last damper’s allowable deformation 100%. Although new damper’s allowable deformation is twofold the old one, it was not enough for seismic applications. In the next step 6 dampers called lead shear dampers (LSD) with modified lead section were tested. LSD deformation increased 200% in comparison with Curadelli’s damper. In the final manufacturing step two dampers called telescopic lead shear dampers (TLSD) were tested. TLSD could tolerate up to 8cm deformation and has two different yield forces which makes it special because it can damp energy in both small and big base excitations. Using lead true stress true strain curves two dampers were modeled in ABAQUS software. Experimental and finite element results greatly converged. Finally, a suitable model for telescopic damper was developed in OpenSees software then a one degree of freedom structure were analyzed using this damper then the results were compared with the bare structure using no dampers and the structure utilizing TADAS damper
  9. Keywords:
  10. Metallic Yield Damper ; Energy Dissipation ; Telescopic Damper ; Shear Yielding ; Structural Control ; Numerical Modeling

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