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Recovery and residual stress of SMA wires and applications for concrete structures

Authors
Choi, EunsooCho, Sung-ChulHu, Jong WanPark, TaehyoChung, Young-Soo
Issue Date
Sep-2010
Publisher
IOP PUBLISHING LTD
Citation
SMART MATERIALS AND STRUCTURES, v.19, no.9, pp.1 - 10
Indexed
SCIE
SCOPUS
Journal Title
SMART MATERIALS AND STRUCTURES
Volume
19
Number
9
Start Page
1
End Page
10
URI
https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/174151
DOI
10.1088/0964-1726/19/9/094013
ISSN
0964-1726
Abstract
In general, NiTi shape memory alloys are used for applications in civil structures. NiTi SMAs show good superelasticity and shape memory effect properties. However, for application of the shape memory effect, it is desirable for SMAs to show a wide temperature hysteresis, especially for civil structures which are exposed to severe environmental conditions. NiTiNb SMAs, in general, show a wider temperature hysteresis than NiTi SMAs and are more applicable for civil structures. This study examines the temperature hysteresis of NiTiNb and NiTi SMAs, and their recovery and residual stress are investigated. In addition, the tensile behaviors of SMA wires under residual stress are evaluated. This study explains the possible applications for concrete structures with the shape memory effect and illustrates two experimental results of concrete cylinders and reinforced concrete columns. For both tests, SMA wires of NiTiNb and NiTi are used to confine concrete using residual stress. The SMA wire jackets on the concrete cylinders increase the peak strength and the ductility compared to the plain concrete cylinders. In addition, the SMA wire jackets on reinforced concrete columns increase the ductility greatly without flexural strength degradation.
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Park, Tae hyo
서울 공과대학 (서울 건설환경공학과)
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