Effect of residual strain on sensing property of FRP-OFBG smart rebar

Zhichun Zhang; Zhi Zhou; Chuan Wang; Jinping Ou

doi:10.1117/12.716033

10 April 2007 Effect of residual strain on sensing property of FRP-OFBG smart rebar

Zhichun Zhang, Zhi Zhou, Chuan Wang, Jinping Ou

Proceedings Volume 6529, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2007; 65293G (2007) https://doi.org/10.1117/12.716033
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2007, San Diego, California, United States

Abstract

FRP-OFBG smart rebar is the smart structure material, which is the integration of good mechanical property and sensing performance. And FRP-OFBG rebar can be widely used in civil engineering health monitoring. But in the smart rebar application procedure, there is large residual strain exiting in FBG in smart rebar, and multiple-peaked to FBG reflection spectrum, which affect the sensing performance of smart rebar. In this paper, it's theoretically analyzed using FBG to measure the residual strain in FRP after fabrication; In smart rebar pultrusion fabrication processing, the strain and temperature were monitored by two connecting FBGs. It's analyzed FRP fabrication processing through monitoring data; To the multiple-peaked smart rebar, which caused by nonuniform residual strain distributing along FBG length, post thermal treatment was done. The result proved that thermal treatment can improve the spectrum of smart rebar and remove the multiple-peaked phenomenon of smart rebar. But the thermal treatment can't relief the residual strain, and further research about how long will the residual strain recovery at room temperature must be done.

Citation Download Citation

Zhichun Zhang, Zhi Zhou, Chuan Wang, and Jinping Ou "Effect of residual strain on sensing property of FRP-OFBG smart rebar", Proc. SPIE 6529, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2007, 65293G (10 April 2007); https://doi.org/10.1117/12.716033

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