Analytical and Parametric Study of Telescopic Lead Shear Damper

Homaei, Hossein | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51283 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Eskandari, Morteza; Arghavani, Jamal
  7. Abstract:
  8. This research studies behavior and implementing of telescopic lead shear damper in structures. Telescopic lead shear damper (TLSD) is a type of metallic yielding dampers that can dissipated energy with usage of shear yielding of lead. TLSD is made from behind act of two lead shear damper (LSD) like a telescope. Lead shear damper composed of two coaxial steel pipes where their interfacial gap is filled with pure lead. The interface of lead and steel pipes are roughened in a threaded form to guarantee the no-slip condition across the interface. Due to stable and fat force displacement hysteresis loops of TLSD, this device can be used in structures subjected to wind, seismic, and other dynamic excitations. In this study, formulations that calculate structural properties of TLSD devices such as yield force, elastic stiffness, and secondary stiffness, ultimate force and tolerable displacement are developed by analytical solution and parametric study. For parametric study one hundred and eight various size of LSD was numerically studied. Based on obtained results and using regression analysis, mechanical characteristic relations of LSD was obtained. Because TLSD made from behind action of two lead shear damper, relations for obtaining mechanical properties of TLSD was derived and TLSD can be modeled. By usage obtained relations, TLSD can be easily used in design and retrofit of structures. In the next part, TLSD was used to retrofitting seismic responses of a building and usage of developed equations was showed. For this purpose a six stories steel building with nonlinear behavior was modeled. This structure was studied with and without TLSD by static nonlinear and time history nonlinear analysis; then various response parameters of structures likes roof displacement, base shear were compared. The results showed TLSD can reduces roof displacement, and then structural damages can be reduced
  9. Keywords:
  10. Metallic Yield Damper ; Parametric Study ; Numerical Solution ; Structural Control ; Seismic Performance ; Nonlinear Analysis

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