Author(s)

Hao Wang ^1,2, Nian Zhu ^1,2, Heng Li ^1,2

Affiliation(s)

¹ Institute of Seismology, CEA, Wuhan, China; Hubei Key Laboratory of Earthquake Early Warning, Wuhan, China
² Hubei Earthquake Administration, Wuhan, China; Wuhan Institute of Earthquake Engineering Co. Ltd., Wuhan, China

Corresponding Author

Heng Li

ABSTRACT

Recently, the fiber Bragg grating (FBG)-based bolt has been proposed and attempted to apply to the monitoring of pit slope stability. However, the measurement performance of the FBG-embedded bolt is known to be influenced not only by strain but also by ambient temperature. This often makes it challenging, if not impossible, to obtain accurate deformation measurements of the bolt. To address this issue, this study developed a novel temperature-compensated double-grating bolt to achieve temperature compensation and accurate strain measurement. This bolt incorporates two FBG sensors installed using different techniques to achieve distinct temperature sensitivity and strain sensitivity coefficients. This unique setup successfully decouples temperature and strain effects in the host bolt by employing the double wavelength matrix method. This paper first details the decoupling principle of the developed bolt, followed by an experimental investigation into its effectiveness and feasibility for temperature compensation and strain measurement in a laboratory setting. The results confirm that the developed bolt provides a great possibility to accurately measure the strain despite significant variations in ambient temperature. This bolt shows promising potential to be used in the area of the monitoring for building structures, mining slopes, and other areas.

KEYWORDS

Optical Fiber Sensing Technology; Temperature-Compensated Double-Grating Bolt; Double Wavelength Matrix Method; Temperature Compensation

CITE THIS PAPER

Hao Wang, Nian Zhu, Heng Li, Development and Performance Evaluation of a Double-Grating Temperature-Compensated Bolt for Accurate Strain Measurement. Journal of Engineering Mechanics and Machinery (2024) Vol. 9: 43-49. DOI: http://dx.doi.org/10.23977/jemm.2024.090206.

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