Performance enhancement of a base-isolation structure using optimal tuned inerter dampers

Feng Qian; Yifan Luo Sr.; Hongxin Sun; Wei Che Tai; Lei Zuo

doi:10.1117/12.2514380

27 March 2019 Performance enhancement of a base-isolation structure using optimal tuned inerter dampers

Feng Qian, Yifan Luo Sr., Hongxin Sun, Wei Che Tai, Lei Zuo

Proceedings Volume 10967, Active and Passive Smart Structures and Integrated Systems XIII; 1096715 (2019) https://doi.org/10.1117/12.2514380
Event: SPIE Smart Structures + Nondestructive Evaluation, 2019, Denver, Colorado, United States

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.

Citation Download Citation

Feng Qian, Yifan Luo Sr., Hongxin Sun, Wei Che Tai, and Lei Zuo "Performance enhancement of a base-isolation structure using optimal tuned inerter dampers", Proc. SPIE 10967, Active and Passive Smart Structures and Integrated Systems XIII, 1096715 (27 March 2019); https://doi.org/10.1117/12.2514380

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available