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Indexed by:会议论文

Date of Publication:2007-01-01

Included Journals:CPCI-S

Page Number:1010-1018

Abstract:Shape memory alloys (SMAs) are a relatively new class of functional material, exhibiting peculiar thermo-mechanical behaviours such as shape memory effect and superelasticity, to be considered for application in seismic engineering. SMAs have the capability to dissipate energy through repeated cyclic loading at large strain without significant permanent deformations. By utilizing the hysteretic damping characteristic and recentring capability of superelastic SMAs, innovative SMA-based devices for passive seismic control can be developed. In this paper, firstly, an improved Graesser and Cozzarelli constitutive model based on plastic theory for superelastic SMAs was introduced. Then an innovative SMA-based damper was proposed and tested. Lastly, nonlinear time history analysis on the multi-story frame structure involving SMA-based dampers subjected to earthquake ground motions was performed. Experimental results show that the proposed passive damper based on superelastic SMA wires has satisfying hysteresis properties, including both recentring and energy dissipating features. Moreover, numerical analysis results indicate the above-mentioned damper is capable of significantly reducing seismic response of structures, which verifies its effectiveness as energy dissipated device for structures.