Abstract
Abstract Concrete structures are easy to produce cracks which seriously affect the safety of the structures. Rayleigh based distributed optical fiber sensing technique has been used to measure the strain field evolution associated with crack initiation and growth in concrete structures. A reinforced concrete beam has been tested under four-point loading test with optical fibers both pasted on the surface and embedded as the distributed sensors. Experimental results indicate that cracks can be detected at sharp peaks of the measured strain distributions, which can be utilized to effectively capture the number of cracks and locate multiple cracks. The abilities of using optical frequency domain reflectometry (OFDR) technology to detect hairline cracks and distinguish neighboring cracks are also discussed. Single crack opening displacement is determined through fitting process which taken the influence of intermediate layers into consideration, the widening and propagation of cracks in the overall concrete beam were detected.
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