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Application of Inerter in Reducing the Seismic Response of Structures Equipped With Tuned Mass Damper

Khorsand, Saeed | 2024

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 57918 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Rahimzadeh Rofooei, Fayaz
  7. Abstract:
  8. The tuned mass dampers (TMD) are being used more often in structures to control the wind-induced vibrations. However, their performance during an earthquake deteriorates due to a relatively wide frequency bandwidth of seismic input as well as nonlinear structural behavior. Increasing the mass of TMD to enhance its performance whilst reducing its sensitivity to detuning has its own limitation in terms of deploying large masses at usually the roof level of the building structures. In that regard, the researchers have employed the inerter, a mechanical device that is able to produce relatively large moment of inertias with a relatively small mass of flywheel, to improve the performance of the TMD. The inerter constant of proportionality to the relative accelerations of its two ends is called inertance and is measured in kilograms. Various studies have demonstrated the performance of inerter-based TMD (TMDI) in linear structures under harmonic or random excitations. TMDI is highly effective in mitigating seismic responses in buildings, particularly when rigidly connected to the ground. However, practical constraints often limit the feasibility of this ideal setup. This study introduces a novel configuration: the AS-type TMDI, which connects the TMDI to an auxiliary structure (AS) adjacent to the main building to simulate a ground connection. To design the AS-type TMDI, this research builds upon insights from studies on TMDIs in adjacent buildings and develops an analogous 3-DOF model representing the TMDI-linked adjacent-building system. This model incorporates two buildings of different heights, allowing the TMDI to be connected at any floor level. Utilizing fixed-point theory, the study derives an analytical solution for the optimal design of TMDI systems within this novel configuration. Additionally, a method is introduced to determine the optimal stiffness and design procedure for the AS itself. The performance of the proposed AS-type TMDI is evaluated through comprehensive nonlinear seismic analysis of a benchmark nine-story steel frame structure, accounting for material and geometric nonlinearities. Results demonstrate that the AS-type TMDI performs comparably to a virtually grounded TMDI in effectively reducing seismic responses. Furthermore, this innovative configuration outperforms both a conventional retrofitting technique, where the building is rigidly connected to the AS, and a system where a viscous damper alone connects the main building to the AS. This highlights the AS-type TMDI's potential to significantly enhance building seismic resilience
  9. Keywords:
  10. Tuned Mass Damper (TMD) ; Structural Control ; Nonlinear Time History Analysis ; Tuned Inerter Damper (TID) ; Inerter-Based Tuned Mass Damper (TMDI) ; Seismic Response ; Vibration Control

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