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18 May 1999 Development of shape memory alloy damper for intelligent bridge systems
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The application of intelligent materials with self-diagnosis functions will provide more efficient and effective earthquake protective system to bridge structures. Shape memory alloys are possible candidates of intelligent materials that are applicable to bridge structures. The damping device made of shape memory alloys that can absorb seismic energy and reduce the seismic force by its pseudo yield effect was proposed. The device also enables the bridge to set again to the original position by its shape memory effects or self-centering effect even if residually displaced. This study focuses on the damping effect of shape memory alloys and verified its effect. First, the experiment to obtain the force-displacement relationship of the propose damping device was carried out in the Martensite and Austenite phases so that the effects were verified in the shape memory phase and super elastic phase. A series of shaking table test were also carried out in order to verify the effect under earthquake type shaking. As a result of this study, the shape memory alloy damper device performs its function more efficient and effective when designed in shape memory phase.
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Yukio Adachi and Shigeki Unjoh "Development of shape memory alloy damper for intelligent bridge systems", Proc. SPIE 3671, Smart Structures and Materials 1999: Smart Systems for Bridges, Structures, and Highways, (18 May 1999);

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