Performance Evaluation of Superelastic Viscous Dampers Considering Temperature Effects

Abstract eng:
This paper investigates the seismic performance of a hybrid damper, named as superelastic viscous damper (SVD), considering environmental temperature changes. The SVD relies on shape memory alloy (SMA) elements for re-centering capability and employs a viscoelastic (VE) damper to augment its energy dissipation capacity. The VE damper consists of two layers of a high damped (HD) blended butyl elastomer compound, sandwiched between and bonded to three identical steel plates. Experimental tests at different temperatures are conducted on SMA elements and HD butyl elastomer to characterize their temperature dependent behavior. A nine-story steel frame building is designed and modeled with SVDs in OpenSees. Nonlinear time history analyses of the steel frame building with installed SVDs are conducted for outside temperatures of 0°C, 23°C and 40°C. A total of 10 far-field ground motion records are employed in the simulations. The variation of peak interstory drift ratio, which is correlated with damage in structural elements, and peak absolute floor acceleration, which is correlated with damage in non-structural components, with temperature are studied. The results show that for the structures designed with SVDs a decrease in temperature below room temperature will produce smaller peak story drift and floor accelerations, while an increase in temperature above room temperature will cause an increase in the peak response quantities of the structure. However, it is shown that this increase is not significant and limited to about 10%.

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