Laboratory of Maintenance and Safety of Structures, Structural Engineering Institute, Swiss Federal Institute of Technology (EPFL), CH-1015 Lausanne, Switzerland.
COSYS-SII, I4S Team (Inria), Univ Gustave Eiffel, IFSTTAR, F-44344 Bouguenais, France.
Sensors (Basel). 2020 Jul 12;20(14):3883. doi: 10.3390/s20143883.
Following the significant improvement in their properties during the last decade, Distributed Fiber Optics sensing (DFOs) techniques are nowadays implemented for industrial use in the context of Structural Health Monitoring (SHM). While these techniques have formed an undeniable asset for the health monitoring of concrete structures, their performance should be validated for novel structural materials including Ultra High Performance Fiber Reinforced Cementitious composites (UHPFRC). In this study, a full scale UHPFRC beam was instrumented with DFOs, Digital Image Correlation (DIC) and extensometers. The performances of these three measurement techniques in terms of strain measurement as well as crack detection and localization are compared. A method for the measurement of opening and closing of localized fictitious cracks in UHPFRC using the Optical Backscattering Reflectometry (OBR) technique is verified. Moreover, the use of correct combination of DFO sensors allows precise detection of microcracks as well as monitoring of fictitious cracks' opening. The recommendations regarding use of various SHM methods for UHPFRC structures are given.
在过去十年中，分布式光纤传感（DFO）技术的性能得到了显著提高，如今已在结构健康监测（SHM）领域中应用于工业领域。虽然这些技术已经成为混凝土结构健康监测不可或缺的资产，但它们的性能应该针对包括超高韧性纤维增强水泥基复合材料（UHPFRC）在内的新型结构材料进行验证。在本研究中，使用 DFO、数字图像相关（DIC）和引伸计对全尺寸 UHPFRC 梁进行了仪器化。比较了这三种测量技术在应变测量以及裂缝检测和定位方面的性能。验证了使用光背向反射计（OBR）技术测量 UHPFRC 中局部虚拟裂缝张开和闭合的方法。此外，正确组合使用 DFO 传感器可以精确检测微裂缝，并监测虚拟裂缝的张开。给出了针对 UHPFRC 结构使用各种 SHM 方法的建议。
