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Proceedings Paper

Performance enhancement of a base-isolation structure using optimal tuned inerter dampers
Author(s): Feng Qian; Yifan Luo Sr.; Hongxin Sun; Wei Che Tai; Lei Zuo
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Paper Abstract

The traditional base-isolated system is vulnerable to long-period ground motions, which usually result in a large displacement concentration at the isolated floor due to the resonant effect. To address this issue, two types of base isolation systems with tuned inerter dampers (TID) composed of a spring, an inerter and a dashpot in serial or parallel, are proposed and evaluated in this paper. The design parameters of the two TID isolation systems are optimized using the H2 norm criteria to achieve the best RMS vibration performance under stochastic excitation. The TID frequency ratio and damping ratio are defined as the design parameters, whose optimal values are analytically derived for the undamped primary system and numerically verified. The results show that the optimum exists for isolation system with serial TID (inerter and dashpot in serious), while in the parallel TID isolation system large TID stiffness and large TID damping are preferred in practice. The parallel TID system cannot be tuned optimally for practical structures, nevertheless, it still achieves a better isolation performance than the optimal serial system by an appropriate selection of the design parameters. The influence of the structural parameters on the optimal design parameters are studied. Case studies are conducted in comparison with the traditional isolation system for a laboratory prototype of a five-story building. The proposed optimal serial TID isolation system has 59% more reduction in the RMS relative displacement between the superstructure and base and 58% in the RMS response of the base vibration under the far-fault earthquake. And 52% and 56% more reductions in the RMS relative displacement and the base vibration are respectively achieved under the near-fault earthquake. The potential power in the TID isolations in earthquakes are also examined.

Paper Details

Date Published: 27 March 2019
PDF: 17 pages
Proc. SPIE 10967, Active and Passive Smart Structures and Integrated Systems XIII, 1096715 (27 March 2019); doi: 10.1117/12.2514380
Show Author Affiliations
Feng Qian, Virginia Polytechnic Institute and State Univ. (United States)
Yifan Luo Sr., Virginia Polytechnic Institute and State Univ. (United States)
Hunan Univ. of Science and Technology (China)
Hongxin Sun, Hunan Univ. of Science and Technology (China)
Wei Che Tai, Michigan State Univ. (United States)
Lei Zuo, Virginia Polytechnic Institute and State Univ. (United States)

Published in SPIE Proceedings Vol. 10967:
Active and Passive Smart Structures and Integrated Systems XIII
Alper Erturk, Editor(s)

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