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Structural Engineering and Mechanics Volume 80, Number 2, October25 2021 , pages 157-168 DOI: https://doi.org/10.12989/sem.2021.80.2.157 |
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Performance of a gas-spring tuned mass damper under seismic excitation |
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Kunjie Rong and Zheng Lu
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| Abstract | ||
| A nonlinear gas-spring is integrated into the traditional tuned mass damper (TMD), leading to a novel gas-spring tuned mass damper (GSTMD) system, which can be used to mitigate the structural responses. To better couple the tuned mass damping system, a symmetrical combined gas-spring (SCGS) is presented based on a single gas-spring, and its mechanical properties are investigated through a case study. The design method of the gas-spring TMD is obtained, and its corresponding configuration parameters are calculated. The control performance and damping mechanism of the gas-spring TMD under the random excitation are studied by parameter analysis, and the reliability of the gas-spring TMD's control performance is also discussed. The results show that the gas-spring TMD has a two-stage damping mechanism, and its working stage can change flexibly with the excitation intensity. Furthermore, the gas-spring TMD has excellent "Reconciling Control Performance", which not only has a comparable control performance as the linear TMD, but also has significant advantages in working stroke, more importantly, the control performance and working stroke of the gas-spring TMD can reconcile with each other. Besides, the control performance of the proposed damper is insensitive to unpredictable seismic excitations, indicating that the gas-spring TMD has good reliability. | ||
| Key Words | ||
| damping mechanism; gas-spring tuned mass damper; nonlinear energy sink; passive control; reliability; working stroke | ||
| Address | ||
| Kunjie Rong: Department of Disaster Mitigation for Structures, Tongji University, Shanghai, 200092, China Zheng Lu: Department of Disaster Mitigation for Structures, Tongji University, Shanghai, 200092, China; State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai, 200092, China | ||