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.

本文提出了一种基于光学频域反射法的分布式光纤传感器来测量和可视化高性能纤维混凝土中的应变和裂缝的方法。使用具有两种纤维的高性能混凝土制备两根梁，并用碳纤维增强聚合物（CFRP）筋进行后张。横梁上装有分布式传感器，这些传感器使用两种与实际构造兼容的方法进行安装。在四点弯曲下测试梁直到失效。分布式传感器实时测量梁整个长度上的应变分布。分析应变分布，以检测，定位，跟踪，量化和可视化裂纹的萌生和扩展过程。从分布式传感器和裂纹显微镜测得的裂纹宽度非常吻合。预期该研究将促进分布式传感技术，以监视和控制新旧结构中的建筑和操作自动化。