Application of Cu-Al-Mn superelastic alloy bars as reinforcement elements in concrete beams

Kshitij C. Shrestha, Yoshikazu Araki, Takuya Nagae, Hayato Yano, Yuji Koetaka, Toshihiro Omori, Yuji Sutou, Ryosuke Kainuma, Kiyohito Ishida

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Citations (Scopus)

Abstract

Experimental works are done to assess the seismic behavior of concrete beams reinforced with superelastic alloy (SEA) bars. Applicability of newly developed Cu-Al-Mn SEA bars, characterized by large recovery strain, low material cost, and high machinability, have been proposed as partial replacements for conventional steel bars in order to reduce residual deformations in structures during and after intense earthquakes. Four-point reverse-cyclic bending tests were done on 1/3 scale concrete beams comprising three different types of specimens - conventional steel reinforced concrete (ST-RC), SEA reinforced concrete (SEA-RC), and SEA reinforced concrete with pre-tensioning (SEA-PC). The results showed that SEA reinforced concrete beams demonstrated significant enhancement in crack recovery capacity in comparison to steel reinforced beam. Average recovery of cracks for each of the specimens was 21% for ST-RC, 84% for SEA-RC, and 86% for SEA-PC. In addition, SEA-RC and SEA-PC beams demonstrated strong capability of recentering with comparable normalized strength and ductility relative to conventional ST-RC beam specimen. ST-RC beam, on the other hand, showed large residual cracks due to progressive reduction in its re-centering capability with each cycle. Both the SEA-RC and SEA-PC specimens demonstrated superiority of Cu-Al-Mn SEA bars to conventional steel reinforcing bars as reinforcement elements.

Original languageEnglish
Title of host publicationSensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2012
DOIs
Publication statusPublished - 2012 May 22
EventSensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2012 - San Diego, CA, United States
Duration: 2012 Mar 122012 Mar 15

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8345
ISSN (Print)0277-786X

Other

OtherSensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2012
CountryUnited States
CitySan Diego, CA
Period12/3/1212/3/15

Keywords

  • Cu-Al-Mn superelastic alloy bars
  • Four-point bending
  • Reinforced concrete
  • Reverse cyclic loading
  • Superelasticity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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  • Cite this

    Shrestha, K. C., Araki, Y., Nagae, T., Yano, H., Koetaka, Y., Omori, T., Sutou, Y., Kainuma, R., & Ishida, K. (2012). Application of Cu-Al-Mn superelastic alloy bars as reinforcement elements in concrete beams. In Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2012 [83452K] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 8345). https://doi.org/10.1117/12.914992