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Confining concrete cylinders using shape memory alloy wires

  • E. Choi
  • Y.-S. Chung
  • B.-S. Cho
  • T.-H. Nam
Article

Abstract.

This study proposed a new method to confine concrete cylinders or reinforced concrete columns using martensitic, Ti-49.7Ni (at %), or austenitic, Ti-50.3Ni (at %), shape-memory-alloy wires. Prestrained martensitic SMA wire was used to wrap a concrete cylinder and, then, was heated by a heating jacket. In the process, confining stress was developed around the cylinder by the SMA wire due to shape memory effect, which can increase the strength and ductility of the cylinder under axial compressive load. For austenitic shape memory wires, some prestraining was introduced in the wires during wrapping concrete cylinders on which post-tensioning stress was generated. In this study, 1.0 mm diameter of martensitic and austenitic SMA wire was used for confinement. Recovery tests were conducted for the martensitic and the austenitic shape memory wires to determine the recovery stress and superelastic behavior, respectively. The confinement by martensitic shape memory wires had increased the strength slightly and the ductility substantially. However, the austenitic shape memory wires only increased the ductility because the imposed prestress was too small. This study showed the potential of the proposed method to retrofit reinforced concrete columns using shape memory wires to protect themselves from earthquakes.

Keywords

Austenite Martensite Shape Memory Shape Memory Alloy Ultimate Strength 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. I.G. Buckle, NCEER-94-0008, National Center of Earthquake Engineering Research (1994) Google Scholar
  2. Y.H. Chai, M.J.N. Priestly, F. Seible, J. Struct. Eng. ASCE 120, 2358 (1994) Google Scholar
  3. R. DesRoches, M. Delemont, Eng. Struct. 24, 325 (2002) Google Scholar
  4. M. Dolce, D. Cardone, R. Marnetto, Earthquake Eng. Struct. Dyn. 29, 945 (2000) Google Scholar
  5. M.J.N. Priestly, Earthquake Spectra J. 4, 389 (1988) Google Scholar
  6. F. Seible, V. Karbhari, Proc. 1st International Conference on Composite in Infrastructure (Tucson, Arizona, 1994) Google Scholar
  7. P. Soroushian, K. Ostowari, A. Nossoni, H. Chowdhury, Transportation Research Record 1770, Paper No. 01-0400 (Washington DC, 2001) Google Scholar
  8. H. Toutanji, P. Balaguru, J. Mater. Civil Eng. ASCE 10, 52 (1998) Google Scholar

Copyright information

© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2008

Authors and Affiliations

  • E. Choi
    • 1
  • Y.-S. Chung
    • 2
  • B.-S. Cho
    • 3
  • T.-H. Nam
    • 4
  1. 1.Department of Civil EngineeringHongik UniversitySeoulKorea
  2. 2.Department of Civil EngineeringChungang UniversitySeoulKorea
  3. 3.Construction Technology Research Center, Dept. of Civil Engr., Inje UniversityKimhaeKorea
  4. 4.Division of Advanced Materials EngineeringGyeoungsang National UniversityJinjooKorea

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