Application of MR damper to base-isolated structures

Norio Iwata; Katsuhiko Hata; Hiroshi Sodeyama; Katsuaki Sunakoda; Hideo Fujitani; Takeshi Hiwatashi; Yoichi Shiozaki; Satsuya Soda

doi:10.1117/12.472572

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28 June 2002 Application of MR damper to base-isolated structures

Norio Iwata, Katsuhiko Hata, Hiroshi Sodeyama, Katsuaki Sunakoda, Hideo Fujitani, Takeshi Hiwatashi, Yoichi Shiozaki, Satsuya Soda

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Proceedings Volume 4696, Smart Structures and Materials 2002: Smart Systems for Bridges, Structures, and Highways; (2002) https://doi.org/10.1117/12.472572
Event: SPIE's 9th Annual International Symposium on Smart Structures and Materials, 2002, San Diego, California, United States

Abstract

This paper presents a comprehensive study on the application of the MR damper to base-isolated building structures. It first proposes a simple semi-active control algorithm for a base-isolated structure with an MR damper. The algorithm, in which the MR damper's hysteresis shape is controlled, aims to reduce the isolator's displacement without increasing the acceleration responses of the upper structures. The second part of this paper covers the properties of an MR fluid and an MR damper developed for a base-isolated model structure. The damper has a nominal capacity of 40kN, which can be adjusted in accordance with the applied magnetic fields. In the test, the damper is subjected to cyclic sinusoidal displacements with different amplitudes, velocities and magnetic field intensities. The last part describes shaking table tests carried out using the MR damper and the base-isolated model structure. It is confirmed that the proposed semi-active control method is effective in reducing the isolator's displacement without increasing the acceleration responses.

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Norio Iwata, Katsuhiko Hata, Hiroshi Sodeyama, Katsuaki Sunakoda, Hideo Fujitani, Takeshi Hiwatashi, Yoichi Shiozaki, and Satsuya Soda "Application of MR damper to base-isolated structures", Proc. SPIE 4696, Smart Structures and Materials 2002: Smart Systems for Bridges, Structures, and Highways, (28 June 2002); https://doi.org/10.1117/12.472572

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