Application of smart BFRP bars with distributed fiber optic sensors into concrete structures

Yongsheng Tang; Zhishen Wu; Caiqian Yang; Gang Wu; Lihua Zhao; Shiwei Song

doi:10.1117/12.847406

31 March 2010 Application of smart BFRP bars with distributed fiber optic sensors into concrete structures

Yongsheng Tang, Zhishen Wu, Caiqian Yang, Gang Wu, Lihua Zhao, Shiwei Song

Proceedings Volume 7647, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2010; 76471I (2010) https://doi.org/10.1117/12.847406
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2010, San Diego, California, United States

Abstract

In this paper, the self-sensing and mechanical properties of concrete structures strengthened with a novel type of smart basalt fiber reinforced polymer (BFRP) bars were experimentally studied, wherein the sensing element is Brillouin scattering-based distributed optical fiber sensing technique. First, one of the smart bars was applied to strengthen a 2m concrete beam under a 4-points static loading manner in the laboratory. During the experiment, the bar can measure the inner strain changes and monitor the randomly distributed cracks well. With the distributed strain information along the bar, the distributed deformation of the beam can be calculated, and the structural health can be monitored and evaluated as well. Then, two smart bars with a length of about 70m were embedded into a concrete airfield pavement reinforced by long BFRP bars. In the field test, all the optical fiber sensors in the smart bars survived the whole concrete casting process and worked well. From the measured data, the concrete cracks along the pavement length can be easily monitored. The experimental results also confirmed that the bars can strengthen the structures especially after the yielding of steel bars. All the results confirm that this new type of smart BFRP bars show not only good sensing performance but also mechanical performance in the concrete structures.

Citation Download Citation

Yongsheng Tang, Zhishen Wu, Caiqian Yang, Gang Wu, Lihua Zhao, and Shiwei Song "Application of smart BFRP bars with distributed fiber optic sensors into concrete structures", Proc. SPIE 7647, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2010, 76471I (31 March 2010); https://doi.org/10.1117/12.847406

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KEYWORDS

Optical fibers

Fiber optics sensors

Fiber reinforced polymers

Mechanical sensors

Spatial resolution

Environmental sensing

Laser scattering

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