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Smart Structures and Systems Volume 25, Number 3, March 2020 , pages 323-335 DOI: https://doi.org/10.12989/sss.2020.25.3.323 |
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Feasibility of a new hybrid base isolation system consisting of MR elastomer and roller bearing |
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Yongmoon Hwang, Chan Woo Lee, Junghoon Lee and Hyung-Jo Jung
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| 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. | ||
| Key Words | ||
| Magnetorheological Elastomer (MRE); Magnetorheological (MR) effect; hybrid base isolation system; semiactive control; hybrid simulation | ||
| Address | ||
| (1) Yongmoon Hwang, Junghoon Lee, Hyung-Jo Jung: Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea; (2) Chan Woo Lee: Department of Civil and Environmental Engineering, Korea Army Academy at Yeong-cheon, Yeong-cheon 38900, Republic of Korea. | ||