Comparing the cyclic behavior of concrete cylinders confined by shape memory alloy wire or steel jackets

Joonam Park, Eunsoo Choi, Kyoungsoo Park, Hong Taek Kim

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Shape memory alloy (SMA) wire jackets for concrete are distinct from conventional jackets of steel or fiber reinforced polymer (FRP) since they provide active confinement which can be easily achieved due to the shape memory effect of SMAs. This study uses NiTiNb SMA wires of 1.0mm diameter to confine concrete cylinders with the dimensions of 300mm × 150mm (L × D). The NiTiNb SMAs have a relatively wider temperature hysteresis than NiTi SMAs; thus, they are more suitable for the severe temperature-variation environments to which civil structures are exposed. Steel jackets of passive confinement are also prepared in order to compare the cyclic behavior of actively and passively confined concrete cylinders. For this purpose, monotonic and cyclic compressive loading tests are conducted to obtain axial and circumferential strain. Both strains are used to estimate the volumetric strains of concrete cylinders. Plastic strains from cyclic behavior are also estimated. For the cylinders jacketed by NiTiNb SMA wires, the monotonic axial behavior differs from the envelope of cyclic behavior. The plastic strains of the actively confined concrete show a similar trend to those of passive confinement. This study proposed plastic strain models for concrete confined by SMA wire or steel jackets. For the volumetric strain, the active jackets of NiTiNb SMA wires provide more energy dissipation than the passive jacket of steel.

Original languageEnglish
Article number094008
JournalSmart Materials and Structures
Volume20
Issue number9
DOIs
Publication statusPublished - 2011 Sep 1

Fingerprint

jackets
Steel
shape memory alloys
Shape memory effect
steels
wire
Wire
Concretes
spectral mixture analysis
volumetric strain
Plastic deformation
plastics
axial strain
Hysteresis
Energy dissipation
Polymers
envelopes
energy dissipation
hysteresis
trends

All Science Journal Classification (ASJC) codes

  • Signal Processing
  • Civil and Structural Engineering
  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Electrical and Electronic Engineering

Cite this

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abstract = "Shape memory alloy (SMA) wire jackets for concrete are distinct from conventional jackets of steel or fiber reinforced polymer (FRP) since they provide active confinement which can be easily achieved due to the shape memory effect of SMAs. This study uses NiTiNb SMA wires of 1.0mm diameter to confine concrete cylinders with the dimensions of 300mm × 150mm (L × D). The NiTiNb SMAs have a relatively wider temperature hysteresis than NiTi SMAs; thus, they are more suitable for the severe temperature-variation environments to which civil structures are exposed. Steel jackets of passive confinement are also prepared in order to compare the cyclic behavior of actively and passively confined concrete cylinders. For this purpose, monotonic and cyclic compressive loading tests are conducted to obtain axial and circumferential strain. Both strains are used to estimate the volumetric strains of concrete cylinders. Plastic strains from cyclic behavior are also estimated. For the cylinders jacketed by NiTiNb SMA wires, the monotonic axial behavior differs from the envelope of cyclic behavior. The plastic strains of the actively confined concrete show a similar trend to those of passive confinement. This study proposed plastic strain models for concrete confined by SMA wire or steel jackets. For the volumetric strain, the active jackets of NiTiNb SMA wires provide more energy dissipation than the passive jacket of steel.",
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Comparing the cyclic behavior of concrete cylinders confined by shape memory alloy wire or steel jackets. / Park, Joonam; Choi, Eunsoo; Park, Kyoungsoo; Kim, Hong Taek.

In: Smart Materials and Structures, Vol. 20, No. 9, 094008, 01.09.2011.

Research output: Contribution to journalArticle

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