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Smart Structures and Systems Volume 34, Number 4, October 2024 , pages 215-227 DOI: https://doi.org/10.12989/sss.2024.34.4.215 |
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Shaking table tests on vibration reduction of multi-degree-freedom structures using SMA spring-based TVA |
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Kunjie Rong, Zhengquan Cheng, Mengyao Zhou, Weiyuan Huang, Ruisheng Ma and Na Li
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| Abstract | ||
| This study utilizes the superelasticity property of shape memory alloy (SMA) to form a shape memory alloy springbased tuned vibration absorber (SMA-TVA) for mitigating vibrations in multi-degree-of-freedom (MDOF) structures. Nitinol SMA is chosen for the fabrication of SMA specimens, and cyclic displacement loading tests are performed on both SMA wire and spring. Shaking table tests are then designed and executed on a three-story steel shear frame under tuned vibration absorber (TVA) and SMA-TVA control, respectively. Four seismic waves are selected to compare the performance of two dampers, with a specific focus on the time-frequency energy evolution of the MDOF structure under different excitations. Furthermore, the robustness of SMA-TVA is validated across varying excitation amplitudes and frequency ratios. Results reveal that SMA-TVA effectively attenuates vibrations beyond its tuning frequency, dissipating energy associated with multiple modes. It outperforms TVA with a significant 109.3% and 85.2% improvement in RMS displacement and acceleration reduction, respectively, with strokes reduced by up to 42.5% under earthquakes. Certain earthquakes exhibit a prolonged period of high energy input, facilitating more efficient and stable attenuation of vibrations for SMA-TVA. The average change in the vibration reduction ratio remains below 13.7% within the considered varying frequency ratios, indicating that SMA-TVA exhibits robustness against tuning frequency deviation. | ||
| Key Words | ||
| passive control; shaking table test; shape memory alloy spring; tuned vibration absorber; vibration reduction | ||
| Address | ||
| (1) Kunjie Rong, Zhengquan Cheng, Mengyao Zhou: School of Civil Engineering, Shandong University, Jinan, Shandong Province, 250061, China; (2) Mengyao Zhou, Weiyuan Huang: Department of Disaster Mitigation for Structures, Tongji University, Shanghai, 200092, China; (3) Ruisheng Ma: Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing, 100124, China; (4) Na Li: College of Civil Engineering, Qilu Institute of Technology, Jinan, Shandong Province, 250200, China. | ||