Distributed Long-Gauge Optical Fiber Sensors Based Self-Sensing FRP Bar for Concrete Structure.
Distributed Long-Gauge Optical Fiber Sensors Based Self-Sensing FRP Bar for Concrete Structure.
复制标题
用于混凝土结构的基于分布式长规格光纤传感器的自传感 FRP 杆
DOI：
10.3390/s16030286
复制
发表时间：
2016-02-25
期刊：
影响因子：
--
通讯作者：
Wu Z
中科院分区：
文献类型：
--
作者：
Tang Y;Wu Z
基于布里渊散射的分布式光纤传感技术在混凝土结构监测中具有优势。然而，空间分辨率的存在大大降低了应变测量的精度，特别是在裂纹周围。同时，光纤的脆性也限制了其进一步的应用。为了提高应变测量精度，首次提出了分布式光纤传感器作为长应变片传感器。然后，将封装好的光纤传感器埋入FRP筋中，研制了一种新型的自感知FRP筋，并进行了应变、温度传感和基本力学性能的试验研究。实验结果证实了该传感器具有良好的上级应变传感特性，即良好的精度、重复性和线性度，以及优异的机械性能。同时，温度传感特性不受长规格封装的影响，使得温度补偿变得容易。此外，还研究了自感知FRP筋与混凝土之间的粘结性能对自感知的影响。最后，通过FRP自感知筋加固混凝土梁的静力试验，进一步验证了FRP自感知筋的感知性能。因此，自感知FRP筋作为混凝土结构的增强材料和埋入式传感器，具有长期结构健康监测（SHM）的潜在应用。
Brillouin scattering-based distributed optical fiber (OF) sensing technique presents advantages for concrete structure monitoring. However, the existence of spatial resolution greatly decreases strain measurement accuracy especially around cracks. Meanwhile, the brittle feature of OF also hinders its further application. In this paper, the distributed OF sensor was firstly proposed as long-gauge sensor to improve strain measurement accuracy. Then, a new type of self-sensing fiber reinforced polymer (FRP) bar was developed by embedding the packaged long-gauge OF sensors into FRP bar, followed by experimental studies on strain sensing, temperature sensing and basic mechanical properties. The results confirmed the superior strain sensing properties, namely satisfied accuracy, repeatability and linearity, as well as excellent mechanical performance. At the same time, the temperature sensing property was not influenced by the long-gauge package, making temperature compensation easy. Furthermore, the bonding performance between self-sensing FRP bar and concrete was investigated to study its influence on the sensing. Lastly, the sensing performance was further verified with static experiments of concrete beam reinforced with the proposed self-sensing FRP bar. Therefore, the self-sensing FRP bar has potential applications for long-term structural health monitoring (SHM) as embedded sensors as well as reinforcing materials for concrete structures.