Fundamentals of Shape Memory Alloy–Rubber Bearing Seismic Design and Assessment
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 8
Abstract
In this study, a shape memory alloy (SMA) and general rubber bearing are used to develop a novel SMA–rubber bearing combination. This bearing is then used to develop a smart isolation system that can achieve vibration control in a bridge structure during earthquakes. The system design is based on a martensitic NiTi SMA (atom fraction of ) with a production diameter of 1.0 mm. The damping provided by the NiTi alloy is frequency dependent and increases with prestrain and amplitude. To investigate the basic mechanical behavior of the designed SMA-rubber bearing, three-dimensional finite-element models were constructed and the optimized parameters of the bearing were analyzed to investigate their effects on mechanical behavior. To assess the isolation effectiveness of the bearing, a simply supported beam bridge with different bearings was investigated under various earthquake excitations to compare the effects of vibration isolation. Through optimization analysis, design parameters for prestrain (3.0–4.0%), value (18–25°), and Shore hardness were obtained. An application analysis showed that the proposed bearings limit the relative displacement of a bridge deck effectively under strong ground motions and that they almost completely recover their original shape.
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Acknowledgments
The writers gratefully acknowledge financial support provided by the Science Foundation of China Postdoctor (Grant No. 20150490183), the Science Foundation of the Ministry of Housing and Urban–Rural Development of the People’s Republic of China (Grant No. 2012-K2-6), the Science and Technology Agency of Zhejiang province (Grant No. 2015C33222), the Science Foundation of Shanghai Postdoctor (Grant No. 13R21421100), and the Wenzhou city science and technology projects (Grant No.G20140017).
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 29 • Issue 8 • August 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Feb 28, 2015
Accepted: Dec 21, 2016
Published ahead of print: Apr 10, 2017
Published online: Apr 11, 2017
Published in print: Aug 1, 2017
Discussion open until: Sep 11, 2017
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