Experimental Study on Seismic Performance of Earthquake-Damaged Frame Retrofitted By Using Sector Lead Viscoelastic Dampers

Abstract eng:
Viscoelastic damper is a kind of widely-used energy dissipation device, which can be equipped in building structures for wind or earthquake vibration control. However, the poor energy dissipation capacity of viscoelastic damper becomes a limit in it’s practical application. To solve this problem, a new high-damping rubber material has been developed and used to produce high-damping rubber dampers (HRD). In this paper, to study the performance of HRD, three HRDs have been produced. The deformation correlation of HRD have been test as well as the frequency correlation and the fatigue property through controlling the loads with different frequency and strain amplitude, variation law of HRD mechanical properties including storage shear modulus, loss shear modulus,the maximum damping force and equivalent viscous damping ratio have been study under different conditions. The results show that the HRD has a good energy dissipation capacity with full hysteresis curve and high equivalent viscous damping ratio; The mechanical properties of HRD has a certain relevance to strain amplitude and loading frequency. The mechanical property parameters decrease with increasing loading laps in the fatigue tests, wherein the storage shear modulus, loss shear modulus and the maximum damping force reduce rapidly until the eleven lap, and then gradually slow.

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