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Experimental and analytical study of telescopic lead yielding damper

Eskandari, M ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jcsr.2018.08.033
  3. Abstract:
  4. In this study, a novel type of passive energy dissipation device called a Telescopic Lead Yielding Damper (TLYD) is proposed and analyzed. This device comprises co-axial steel cylinders and lead rings, such that these rings act as shear locks between the steel cylinders. TLYDs dissipate energy through the plastic shear deformation of lead metal. The telescopic mechanism used in TLYDs allows these small-sized dampers to tolerate large axial displacements with low fatigue. For each telescopic level, a yield plateau is added to the hysteresis behavior of TLYD devices. Each yield plateau resists a different performance level, namely design-based and maximum credible earthquakes. Seven single-yield level and two multi-yield level TLYDs were manufactured and tested in a quasi-static manner to investigate the hysteresis behavior of such devices. The tests indicated that these devices are rate independent, can tolerate large displacements, and are low-cycle, large-displacement fatigue resistant. In addition, a finite element (FE) model was developed to determine the accuracy of the experimental results. Since the finite element and experimental results were in good agreement, the FE analysis can be used for further studies. Furthermore, to analyze the structures equipped with TLYD devices, a telescopic model was developed in the OpenSees software. Afterwards, the cumulative dissipated energies of the specimens were calculated. The results showed that in loops where the telescopic mechanism activates, the dissipated energy grows faster. Finally, the effective damping and stiffness of TLYD specimens were calculated, and it was concluded that the damping capacity of TLYD devices was high. © 2018 Elsevier Ltd
  5. Keywords:
  6. Lead metal ; Quasi-static cyclic test ; Telescopic lead yielding damper ; TLYD ; Asphalt pavements ; Cylinders (shapes) ; Energy dissipation ; Fatigue of materials ; Finite element method ; Hysteresis ; Seismic design ; Cyclic tests ; Lead metals ; Metallic yielding dampers ; Passive energy dissipation ; Telescopic lead yielding damper ; TLYD ; Damping
  7. Source: Journal of Constructional Steel Research ; Volume 150 , 2018 , Pages 371-383 ; 0143974X (ISSN)
  8. URL: https://www.sciencedirect.com/science/article/pii/S0143974X17313573