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Feasibility of a new hybrid base isolation system consisting of MR elastomer and roller bearing

  • Hwang, Yongmoon (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology) ;
  • Lee, Chan Woo (Department of Civil and Environmental Engineering, Korea Army Academy at Yeong-cheon) ;
  • Lee, Junghoon (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology) ;
  • Jung, Hyung-Jo (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology)
  • Received : 2019.10.03
  • Accepted : 2020.01.09
  • Published : 2020.03.25

Abstract

Magnetorheological elastomer (MRE), a smart material, is an innovative material for base isolation system. It has magnetorheological (MR) effect that can control the stiffness in real-time. In this paper, a new hybrid base isolation system combining two electromagnetic closed circuits and the roller bearing is proposed. In the proposed system, the roller part can support the vertical load. Thus, the MRE part is free from the vertical load and can exhibit the maximum MR effect. The MRE magnetic loop is constructed in the free space of the roller bearing and forms a strong magnetic field. To demonstrate the performance of the proposed hybrid base isolation system, dynamic characteristic tests and performance evaluation were carried out. Dynamic characteristic tests were performed under the extensive range of strain of the MRE and the change of the applied current. Performance evaluation was carried out using the hybrid simulation under five earthquakes (i.e., El Centro, Kobe, Hachinohe, Northridge, and Loma Prieta). Especially, semi-active fuzzy control algorithm was applied and compared with passive type. From the performance evaluation, the comparison shows that the new hybrid base isolation system using fuzzy control algorithm is superior to passive type in reducing the acceleration and displacement responses of a target structure.

Keywords

Acknowledgement

Supported by : National Research Foundation Korea (NRF)

This work was supported by the National Research Foundation Korea (NRF) grant funded by the Korea government (MSIP) (NRF-2019R1A2C2007835 and No. 2017R1A5A1014883).

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