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Smart Structures and Systems
  Volume 8, Number 2, August 2011, pages 173-190
DOI: http://dx.doi.org/10.12989/sss.2011.8.2.173
 


Displacement-based design approach for highway bridges with SMA isolators
Jin-long Liu, Songye Zhu, You-lin Xu and Yunfeng Zhang

 
Abstract
    As a practical and effective seismic resisting technology, the base isolation system has seen extensive applications in buildings and bridges. However, a few problems associated with conventional leadrubber bearings have been identified after historical strong earthquakes, e.g., excessive permanent deformations of bearings and potential unseating of bridge decks. Recently the applications of shape memory alloys (SMA) have received growing interest in the area of seismic response mitigation. As a result, a variety of SMA-based base isolators have been developed. These novel isolators often lead to minimal permanent deformations due to the self-centering feature of SMA materials. However, a rational design approach is still missing because of the fact that conventional design method cannot be directly applied to these novel devices. In light of this limitation, a displacement-based design approach for highway bridges with SMA isolators is proposed in this paper. Nonlinear response spectra, derived from typical hysteretic models for SMA, are employed in the design procedure. SMA isolators and bridge piers are designed according to the prescribed performance objectives. A prototype reinforced concrete (RC) highway bridge is designed using the proposed design approach. Nonlinear dynamic analyses for different seismic intensity levels are carried out using a computer program called
 
Key Words
    displacement-based design; shape memory alloy; base isolation; self-centering seismic resisting system; highway bridges; nonlinear response spectra.
 
Address
Jin-long Liu : Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hung Hom,
Kowloon, Hong Kong, China , Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China
Songye Zhu : Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hung Hom,
Kowloon, Hong Kong, China
You-lin Xu : Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hung Hom,
Kowloon, Hong Kong, China
Yunfeng Zhang : Department of Civil and Environmental Engineering, University of Maryland, College Park, MD, USA
 

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