Research Papers

A Highly Adjustable Base Isolator Utilizing Magnetorheological Elastomer: Experimental Testing and Modeling

[+] Author and Article Information
Yancheng Li

Centre for Built Infrastructure Research,
School of Civil and Environmental Engineering,
Faculty of Engineering and
Information Technology,
University of Technology Sydney,
Ultimo, New South Wales 2007, Australia
e-mail: Yancheng.li@uts.edu.au

Jianchun Li

Centre for Built Infrastructure Research,
School of Civil and Environmental Engineering,
Faculty of Engineering and
Information Technology,
University of Technology Sydney,
Ultimo, New South Wales 2007, Australia
e-mail: Jianchun.li@uts.edu.au

1Corresponding author.

Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received December 16, 2013; final manuscript received May 4, 2014; published online November 12, 2014. Assoc. Editor: Mohammed Daqaq.

J. Vib. Acoust 137(1), 011009 (Feb 01, 2015) (7 pages) Paper No: VIB-13-1433; doi: 10.1115/1.4027626 History: Received December 16, 2013; Revised May 04, 2014; Online November 12, 2014

This paper presents a recent research advance on the development of a novel adaptive seismic isolation system to be used in seismic protection of civil structures. A highly adjustable laminated magnetorheological elastomer (MRE) base isolator was developed and experimental results show that the prototypical MRE base isolator provides increase in lateral stiffness up to 1630%. To facilitate the structural control development using such adaptive MRE base isolator, an analytical model was developed to simulate its behaviors. Comparison between the analytical model and experimental data proves the effectiveness of such model in reproducing the behavior of MRE base isolator.

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Fig. 1

Cross section of the MRE base isolator

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Fig. 2

Stress–strain behavior of MR elastomer

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Fig. 3

Sketch map of the experimental setup

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Fig. 4

MRE base isolator during testing

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Fig. 5

Force responses of the MRE base isolator at sinusoidal loading with Δ = 2 mm and f = 1.0 Hz

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Fig. 6

Force–displacement relationships of the MRE base isolator at dynamic testing with frequency of 2.0 Hz (Δ = 2 mm, 4 mm, and 8 mm)

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Fig. 7

Force–displacement loops of the MRE base isolator at different loading amplitudes (f = 0.1 Hz)

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Fig. 8

Force–displacement loops of the MRE base isolator at different loading amplitudes (f = 1.0 Hz)

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Fig. 9

Strain-stiffening mechanical model for MRE base isolator

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Fig. 10

Comparison between the experimental data and model prediction




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