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Proceedings Paper

Constraint super-elastic SMA based experimental study of self-monitoring and repairing of concrete beam crack
Author(s): Sheng-kui Di; Sheng-wei Ji; Wei-pan Hua; Hui Li; Steve Zou
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Paper Abstract

Taking advantages of the characteristics of super-elasticity and restoring forces while the shape memory alloy(SMA) wire (4.0mm in diamerer) was excited, concrete modal beams was established, and Ni-Ti SMA wire with different prestretching length and different quantity under martensitic state were embedded into the concrete tensile zone before the concrete casted under environmental temperature. The relationship between the resistance rate of SMA and the cracks width of beams was studied under loaded process, and the variety regulation of the cracks width of beam was reply while excited by electrifying. The impact of slip and bond between the concrete and SMA was taken into account (to prevent the slip of the SMA by embedding the anchors into both ends of the beam), while the process was simulated considering the influence of additional resistance coming from the anchor. The result agreed with the experiment well. It is shown that: the crack closed almost completely and the deformation recovered suddenly after the SMA was excited by electrifying; The drive effect can be improved by adding the quantity of SMA; If the cracks width of beam were less than 1.5mm, Clearly a linear relationship was between the rate of change alloy resistance and the rate of crack width of the concrete beam. The residual deformation of rebar played a very negative role in the recovering of the residual deformation.

Paper Details

Date Published: 20 October 2009
PDF: 9 pages
Proc. SPIE 7493, Second International Conference on Smart Materials and Nanotechnology in Engineering, 74930N (20 October 2009);
Show Author Affiliations
Sheng-kui Di, Lanzhou Univ. of Technology (China)
Sheng-wei Ji, Lanzhou Univ. of Technology (China)
Wei-pan Hua, Lanzhou Univ. of Technology (China)
Hui Li, Lanzhou Univ. of Technology (China)
Steve Zou, Dalhousie Univ. (Canada)

Published in SPIE Proceedings Vol. 7493:
Second International Conference on Smart Materials and Nanotechnology in Engineering
Jinsong Leng; Anand K. Asundi; Wolfgang Ecke, Editor(s)

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