Journal
STRUCTURAL CONTROL & HEALTH MONITORING
Volume 28, Issue 2, Pages -Publisher
JOHN WILEY & SONS LTD
DOI: 10.1002/stc.2664
Keywords
bond stress; cracks in concrete; distributed fibre optic sensing; rebar deformation; reinforced concrete; yielding sequence
Funding
- Swiss National Science Foundation [P2ELP2_181928]
- Swiss National Science Foundation (SNF) [P2ELP2_181928] Funding Source: Swiss National Science Foundation (SNF)
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Distributed fiber optic sensing (DFOS), particularly Optical Frequency Domain Reflectometry (OFDR), is increasingly utilized in civil engineering due to its higher accuracy and resolution. Experimental studies have shown that different types of optical fiber embedded in concrete and rebar can affect the measured strain response significantly, with higher performing fibers offering unprecedented detail and potential for application in RC structures. Recommendations for cables with different size and structure are provided based on the findings.
Distributed fiber optic sensing (DFOS) is increasingly being applied in civil engineering. One recently emerging type of DFOS, Optical Frequency Domain Reflectometry (OFDR), offers improved accuracy and resolution. This paper presents an experimental study that investigates the ability of OFDR, implemented using several types of fiber optic cable, to detect concrete cracking and large strain steel deformation. More specifically, the experimental investigation involved six reinforced concrete specimens with different types of optical fiber embedded in both the concrete and rebar. OFDR successfully detected continuous rebar deformation and bond stress through the post yielding range, as well as strain localization indicative of concrete cracking. The type of optical fiber is shown to have a substantial influence on the measured strain response after the onset of nonlinear behavior (i.e., cracking and yielding) and into the large deformation regime where measurement survivability becomes an issue. The higher performing fibers reveal unprecedented detail regarding the interaction between concrete and rebar and demonstrate potential for application in RC structures. Based on these findings, the paper gives practical recommendations for cables with different size and structure.
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