Determination of the Characteristics of a New Prestressed Lead Extrusion Damper

Abstract eng:
The energy released by an earthquake transforms into other forms of energies through the structural system i.e. recoverable and irrecoverable energies. The supplemental damping that is provided to a structural system via supplementary damping devices increases the irrecoverable energy extent so the displacement and acceleration demands of the structure decreases. There are different types of devices which are utilizing in the diverse energy dissipating mechanisms. Lead extrusion damper (LED) is a passive energy dissipater utilizing the hysteretic energy dissipation properties of lead alloys. The LED developed in this study has not including lubricant layer and hydraulic seals. By means of its innovative design, the cap is employed to provide pre-stressing on lead core. The design aimed low-cost and more durable LEDs. Force-displacement behavior of the new LED which owns pre-stressing on the lead core was obtained for sinusoidal displacement cycles with altered frequency and amplitude targets. The effects of frequency and amplitude of the excitation on the dissipated energy (E D ) and equivalent damping ratio (ξ eq ) are investigated within the existing laboratory circumstances. The energy dissipation increases with the ascending displacement amplitudes and remains almost constant with a certain range of frequency that is adopted through the experimental program. The equivalent damping ratio is obtained as 58% on average where the minimum and maximum values are calculated as 53% and 62%, respectively.

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