Structural Engineering and Mechanics

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Design and application of a novel eddy current damper for a high-rise sightseeing tower

  • Kaifang Liu (College of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Yanhui Liu (Earthquake Engineering Research & Test Center (EERTC), Guangzhou University) ;
  • Chia-Ming Chang (Department of Civil Engineering, National Taiwan University) ;
  • Ping Tan (Earthquake Engineering Research & Test Center (EERTC), Guangzhou University)
  • Received : 2022.04.23
  • Accepted : 2023.04.17
  • Published : 2023.05.25
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Abstract

A conventional tuned mass damper (TMD) provides a passive control option to suppress the structures' wind- or earthquake-induced vibrations. However, excessive displacements of the TMD raise concerns in the practical implementation. Therefore, this study proposes a novel TMD designed for and deployed on a high-rise sightseeing tower. The device consists of an integrated two-way slide rail mount and an eddy current damper (ECD) with a stroke control mechanism. This stroke control mechanism allows the damping coefficient to automatically increase when the stroke reaches a predetermined value, preventing excessive damper displacements during large earthquakes. The corresponding two-stage damping parameters are designed with a variable-thickness copper plate to enable the TMD stroke within a specified range. Thus, this study discusses the detailed design schemes of the device components in TMD. The designed two-stage damping parameters are also numerically verified, and the structural responses with/without the TMD are compared. As seen in the results, the proposed TMD yields effective control authority to limit the acceleration response within a comfort level. In addition, this TMD resolves the spatial availability for the damper movement in high-rise buildings by the controllable damping mechanism.

Keywords

Acknowledgement

This work was mainly funded by the National Key R&D Project of China (No.2019YFE0112500), the Natural Science Foundation of Guangdong Province of China (No. 2021A1515010586), and the National Natural Science Foundation of China (No.51978185). We gratefully acknowledge their supports.

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