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doi:10.3850/9789628014194_0016
Modeling of an SMA-Based Self-Centering Damper and its Control Performance Analysis
Hong-Wei Ma1,2,a and Michael C. H. Yam2,b
1Department of Civil Engineering, South China University of Technology, Guangzhou,
510640, P.R. China.
ahwma@scut.edu.cn
2Department of Building and Real Estate, The Hong Kong Polytechnic University,
Hung Hom Kowloon, Hong Kong.
bbsmyam@inet.polyu.edu.hk
ABSTRACT
Superelastic shape memory alloys (SMAs) are capable of recovering their original shape upon unloading. This paper presents a new SMA-based damper employing this unique characteristic of SMAs. The proposed damper consists of energy dissipating and re-centering functional groups, and the core components are two groups of pre-tensioned SMA wires and pre-compressed springs. To predict the mechanical behavior of the damper, a robust modeling method is presented based on the Bouc-Wen model. The validation study results indicate that the damper is capable of showing both moderate energy dissipating capacity and full self-centering capability. Meanwhile, time history analysis has been conducted on the SMA damper controlled frame. The results demonstrate that the damper is capable of mitigating both the floor displacement amplitude and interstorey shear force. For the ground floor of the controlled frame in the case study, a 20% reduction of maximum interstorey drift force is observed.
Keywords: Dampers, Re-centering, Seismic response, Shape memory alloy, Superelastic effect, Vibration control.
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