With the development of technology to upgrade existing concrete structures using externally bonded fiber-reinforced polymer composites, the properties that are inherent in fiber-reinforced polymer sheets, such as low bonding ductility between fiber-reinforced polymer and concrete, have been highlighted as presenting a challenge. This article presents a novel, smart, self-sensing fiber-reinforced polymer sheet, by hybridizing the fiber-reinforced polymer sheet with woven long-gauge carbon fiber line sensors, in order to monitor the macrostrain changes of the fiber-reinforced polymer sheet. To examine the behavior of the smart fiber-reinforced polymer sheet, a direct tensile test was carried out. The results clarified that the carbon fiber line sensor has a linear relationship with applied stress, and the woven carbon fiber line sensor can work homogeneously with the fiber-reinforced polymer sheet as one unit. A simply supported prestressed concrete beam, strengthened with the smart fiber-reinforced polymer sheet, was tested by means of a four points bending test. This test showed that the carbon fiber line sensor can distinctly detect the cracking load and the initial debonding between the fiber-reinforced polymer sheet and the concrete surface. This article demonstrated that the fabrication of smart fiber-reinforced polymer sheet-sensing structures for structural health monitoring would be beneficial.

中文翻译：

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带有编织碳纤维线传感器的智能自感纤维增强聚合物片，用于结构健康监测

随着使用外部粘合纤维增强聚合物复合材料升级现有混凝土结构的技术的发展，纤维增强聚合物片材固有的特性，例如纤维增强聚合物与混凝土之间的低粘合延展性，已被强调为呈现出挑战。本文通过将纤维增强聚合物片与编织长规格碳纤维线传感器混合，提出了一种新颖、智能、自感应的纤维增强聚合物片，以监测纤维增强聚合物片的宏观应变变化。为了检查智能纤维增强聚合物片的行为，进行了直接拉伸试验。结果表明，碳纤维线传感器与外加应力呈线性关系，编织碳纤维线传感器可以与纤维增强聚合物片材作为一个单元均匀工作。用智能纤维增强聚合物板加强的简支预应力混凝土梁通过四点弯曲试验进行了测试。该测试表明，碳纤维线传感器可以清楚地检测纤维增强聚合物片材与混凝土表面之间的开裂载荷和初始脱粘。本文表明，制造用于结构健康监测的智能纤维增强聚合物片传感结构将是有益的。该测试表明，碳纤维线传感器可以清楚地检测纤维增强聚合物片材与混凝土表面之间的开裂载荷和初始脱粘。本文表明，制造用于结构健康监测的智能纤维增强聚合物片传感结构将是有益的。该测试表明，碳纤维线传感器可以清楚地检测纤维增强聚合物片材与混凝土表面之间的开裂载荷和初始脱粘。本文表明，制造用于结构健康监测的智能纤维增强聚合物片传感结构将是有益的。