Experimental testing of a self-sensing FRP-concrete composite beam using FBG sensors

Yanlei Wang; Qingduo Hao; Jinping Ou

doi:10.1117/12.815601

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30 March 2009 Experimental testing of a self-sensing FRP-concrete composite beam using FBG sensors

Yanlei Wang, Qingduo Hao, Jinping Ou

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Proceedings Volume 7292, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2009; 72923T (2009) https://doi.org/10.1117/12.815601
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2009, San Diego, California, United States

Abstract

A new kind of self-sensing fiber reinforced polymer (FRP)-concrete composite beam, which consists of a FRP box beam combined with a thin layer of concrete in the compression zone, was developed by using two embedded FBG sensors in the top and bottom flanges of FRP box beam at mid-span section along longitudinal direction, respectively. The flexural behavior of the proposed self-sensing FRP-concrete composite beam was experimentally studied in four-point bending. The longitudinal strains of the composite beam were recorded using the embedded FBG sensors as well as the surfacebonded electric resistance strain gauges. Test results indicate that the FBG sensors can faithfully record the longitudinal strain of the composite beam in tension at bottom flange of the FRP box beam or in compression at top flange over the entire load range, as compared with the surface-bonded strain gauges. The proposed self-sensing FRP-concrete composite beam can monitor its longitudinal strains in serviceability limit state as well as in strength limit state, and will has wide applications for long-term monitoring in civil engineering.

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Yanlei Wang, Qingduo Hao, and Jinping Ou "Experimental testing of a self-sensing FRP-concrete composite beam using FBG sensors", Proc. SPIE 7292, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2009, 72923T (30 March 2009); https://doi.org/10.1117/12.815601

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