期刊
ENGINEERING STRUCTURES
卷 250, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.engstruct.2021.113407
关键词
SMA; Experimental study; Self-centering; Damper; Variable friction
资金
- National Natural Science Foun-dation of China [51808317, 52178267]
This paper presents a new type of self-centering damper utilizing shape memory alloy bolts and variable friction mechanism, named the SMA slip friction damper (SMASFD), with experimental validations demonstrating its excellent performance. Both analytical methods and numerical simulations were validated by experimental data to provide further understanding of the damper.
This paper proposes a new type of self-centering (SC) damper which exploits the shape memory alloy (SMA) bolts and variable friction mechanism, termed the SMA slip friction damper (SMASFD). The theoretical equations governing the force-displacement relationship, the equivalent stiffness and the equivalent viscous damping are first derived. Then, the application potential of such damper is briefly discussed. In the experimental study, the results of the experimental validations of the SMA bolts and the friction mechanism are presented, followed by the results of proof-of-concept test on the fabricated SMASFDs. According to the testing results, the damper exhibited a symmetric tension-compression flag-shaped hysteresis characterized by excellent SC capacity and good damping capability. The prestrain treatment was applied to the SMA bolts in one test, which was found effectively increased the initial stiffness of the damper. To provide a further understanding on the damper and examine the stress and strain demands of the components, high-fidelity finite element models were established for numerical simulations. Both the analytical method and numerical simulation were validated by the experimental data.
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