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July 29, 2026SensorsOpen Access

Experimental Research on Online Monitoring of Crack Evolution Process of π-Type Beams Based on Ultra-Weak FBG Array Sensing Technology

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Authors

QNQiuming NanWuhan University of TechnologyYZYichan ZhangWuhan University of TechnologyJZJuncheng ZengYunnan University

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Overview

Experimental research demonstrates real-time monitoring of crack evolution in π-type beams, indicating advanced structural health assessment capabilities.

Key Points

  • This research investigates the effectiveness of ultra-weak Fiber Bragg Grating (UWFBG) array sensing technology for monitoring crack evolution in π-type beams.
  • Instrumented a 16 m π-beam with a UWFBG strain sensing system
  • Performed loading tests up to failure while monitoring crack development
  • Conducted quantitative correlation analysis between UWFBG strains and manual crack measurements.
  • Crack initiation was detected at 848.7 kN and tracked over stages with a final count of 90 cracks
  • Maximum crack width reached 1.21 mm and length 246.5 cm under a load of 1791.7 kN
  • Strong linear correlation was established with R2 = 0.971 between UWFBG strains and crack widths, supporting strain-based monitoring.

Cite This Study

Nan et al. (2026) studied this question.

synapsesocial.com/papers/6a69a28ac8da07d9defa61afhttps://doi.org/10.3390/s26154779
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