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基于混凝土模型试验,对涂敷层的传感光纤的裂缝复用能力进行了定量分析,得到了传感光纤和工程结构裂缝夹角在30°,45°,60°时的复用能力与裂缝宽度的关系曲线。对由软性材料构成的光纤涂敷层来说,光纤的复用能力随涂敷层厚度的增加而增大,在与裂缝夹角成45°时,二次涂敷粗光纤的复用能力约为细光纤的5倍,表明光纤敷层对光纤裂缝监测的复用能力具有较大影响。对这种影响的机理进行了理论分析和试验研究,发现当混凝土开裂时,光纤沿混凝土界面的滑移是光纤涂敷层影响光纤裂缝复用能力的主要原因,在光纤与裂缝夹角成45°时,这一影响占60%以上。
Based on the concrete model test, the capability of splitting the sensing fiber in the coating layer was quantitatively analyzed, and the multiplexing ability and crack of the sensing fiber and engineering structure with the included angle of 30 °, 45 ° and 60 ° were obtained. The width of the curve. For a fiber coating composed of a soft material, the reusability of the fiber increases with the thickness of the coating and the reusability of the secondary coated coarse fiber at a 45 ° angle to the crack About 5 times the fine optical fiber, indicating that optical fiber coating on optical fiber crack monitoring has a greater impact on the reuse. The mechanism of this kind of influence is theoretically analyzed and experimentally studied. It is found that when the concrete cracks, the slip of the fiber along the concrete interface is the main reason that the fiber coating layer affects the reusability of the optical fiber. When the angle between the fiber and the crack is 45 °, this effect accounted for more than 60%.