Measurement and visualization of strains and cracks in CFRP post-tensioned fiber reinforced concrete beams using distributed fiber optic sensors

Xiao Tan, Adi Abu-Obeidah, Yi Bao, Hani Nassif, Wassim Nasreddine

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

This paper presents a method to measure and visualize strains and cracks in high-performance fiber-reinforced concrete using distributed fiber optic sensors based on optical frequency domain reflectometry. Two beams were prepared using high-performance concrete with two types of fibers and post-tensioned with carbon-fiber-reinforced polymer (CFRP) tendons. The beams were instrumented with distributed sensors which were installed using two methods compatible with realistic construction. The beams were tested under four-point bending until failure. The distributed sensors measured strain distributions over the length of the beams in real time. The strain distributions are analyzed to detect, locate, trace, quantify, and visualize cracks during the processes of their initiation and propagation. The crack widths measured from the distributed sensors as well as a crack microscope are in a good agreement. This study is expected to promote distributed sensing technology for monitoring and control of construction and operation automation in new and existing structures.

Original languageEnglish (US)
Article number103604
JournalAutomation in Construction
Volume124
DOIs
StatePublished - Apr 2021

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Civil and Structural Engineering
  • Building and Construction

Keywords

  • Crack detection
  • Crack width
  • Distributed fiber optic sensors (DFOS)
  • High-performance fiber-reinforced concrete (HPFRC)
  • Optical frequency domain reflectometry (OFDR)
  • Structural health monitoring (SHM)

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