3 April 2012 Application of Cu-Al-Mn superelastic alloy bars as reinforcement elements in concrete beams
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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.
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Kshitij C. Shrestha, Kshitij C. Shrestha, Yoshikazu Araki, Yoshikazu Araki, Takuya Nagae, Takuya Nagae, Hayato Yano, Hayato Yano, Yuji Koetaka, Yuji Koetaka, Toshihiro Omori, Toshihiro Omori, Yuji Sutou, Yuji Sutou, Ryosuke Kainuma, Ryosuke Kainuma, Kiyohito Ishida, Kiyohito Ishida, } "Application of Cu-Al-Mn superelastic alloy bars as reinforcement elements in concrete beams", Proc. SPIE 8345, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2012, 83452K (3 April 2012); doi: 10.1117/12.914992; https://doi.org/10.1117/12.914992

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