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http://dx.doi.org/10.5000/EESK.2007.11.5.023

Bending behavior of shape memory alloy bar and its application of seismic restrainers for bridges  

Choi, Eun-Soo (홍익대학교 토목공학과)
Park, Joo-Nam (한국철도기술연구원 철도구조물연구팀)
Kim, Hak-Soo (호남대학교 토목공학과)
Lee, Do-Hyung (배재대학교 공과대학 건설환경철도공학과)
Publication Information
Journal of the Earthquake Engineering Society of Korea / v.11, no.5, 2007 , pp. 23-32 More about this Journal
Abstract
The goal of this study is to perform several bending tests on a shape memory alloy bar and to analyze the characteristics of the bending behavior. The other goal is to verify the seismic performance of an SMA bar bending application. Single and double bending tests were conducted with varying loading speeds and maximum displacement. The loading and the unloading stiffness were estimated from the force-displacement curves and the equivalent damping ratio of each test was also assessed. In single bending, the SMA bar showed the stiffness hardening after the displacement of 32 mm. It is assumed that this phenomenon is due to the stress-induced-martensite hardening. The increasing loading speed did not influence on the stiffness of the single bending SMA bar. The stiffness of the double bending bar is about 5 times of that of the single bending. This study introduced a seismic application of SMA bending bars as seismic restrainers for bridges and showed its practicality. SMA bars in bending are used for seismic restrainers in a three-span-simply-supported bridge. They showed the effectiveness to reduce the responses of the bridge and the applicability for a seismic restrainer. The significance of this study is to provide basic knowledge of SMA bending and its seismic applications.
Keywords
Shape Memory Alloy; Bridges; Seismic Restrainer; Bending Behavior;
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  • Reference
1 Adachi, Y., Unjoh, S. and Kondoh, M. 'Development of a Shape Memory Alloy Damper for Intelligent Bridge Systems,' Proceedings of the International Symposium on Shape Memory Materials, Kanazawa, Japan, 1999, pp. 31-34
2 Choi, E. Seismic analysis and retrofit of Mid America bridges, Dept. Civil and Environmental Engineering. Georgia Institute of Technology. Atlanta, GA, USA, 2002
3 DesRoches, R. and Fenves, G.L. 'New Design and Analysis Procedures for Intermediate Hinges in Multiple- Frames Bridges,' Report No. UCB/EERC-97/12, Earthquake Engineering Research Center, University of California, Berkeley, CA., December, 1997
4 Wen, Y.K. and Wu, C.L. 'Uniform Hazard Ground Motions for Mid-America Cities,' Earthquake Spectra, Vol. 17, No. 2, 2001, pp. 359-384   DOI   ScienceOn
5 Wilde K. Gardoni, P. and Fukino Y. 'Base isolation system with shape memory alloy device for elevated highway bridges,' Engineering Structures 22, 2000, pp. 222-229   DOI   ScienceOn
6 Dolce, M., Cardone, D. and Marnetto, R., Implementation and testing of passive control devices based on shape memory alloys. Earthquake Engineering and Structure Dynamics, 2000, 29: 945-968   DOI   ScienceOn
7 Ocel J., DesRoches, R., Leon, R.T., Hess, W.G., Krumme, R., Hayes, J.R. and Sweeney, S. 'Steel Beam Column Connections Using Shape Memory Alloys,' Journal of Structural Engineering, ASCE, Vol. 130. No. 5, May, 2004, pp.732-740   DOI   ScienceOn
8 DesRoches, R. and Delemont, M., Seismic retrofit of simply supported bridges using shape memory alloys. Engineering Structures, 2002, 24:325-332   DOI   ScienceOn
9 DesRoches, R., McCormick, J. and Delemont M. 'Cyclic Properties of Superelastic Shape Memory Alloy wires and Bars,' Journal of Structural Engineering, ASCE, Vol. 130, No. 1, January, 2004, pp. 38-46   DOI   ScienceOn
10 Graesser E.J. and Cozzarelli F.A., 'Shape memory alloys as new materials for aseismic isolation,' Journal of Engineering Mechanics, ASCE, 1991, 117(11): 2590-608   DOI
11 Prakash, V., Powell, G.H., Campbell, S.D. and Filippou, F.C., DRAIN 2DX User Guide, Department of Civil Engineering, University of California at Berkeley, 1992