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Quantitative strain measurement and crack opening estimate in concrete structures based on OFDR technology

机译：基于DSDR技术的混凝土结构中的定量应变测量和裂缝开度估计

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摘要

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.
机译：混凝土结构易于产生严重影响结构安全的裂缝。基于瑞利的分布式光纤传感技术用于测量与混凝土结构的裂纹启动和生长相关的应变场演化。钢筋混凝土梁已经在四点装载试验下进行了测试，光纤粘贴在表面上并嵌入作为分布式传感器。实验结果表明，可以在测量的应变分布的尖锐峰处检测裂缝，其可用于有效地捕获裂缝的数量并定位多个裂缝。还讨论了使用光学频域反射率（OFDR）技术来检测发际线裂缝并区分邻近裂缝的能力。通过拟合过程确定单裂缝开口位移，这通过拟合过程考虑了中间层的影响，检测了整个混凝土梁中的裂缝的加宽和传播。

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