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基于对现有结构健康监测(SHM)的分析,提出了利用应变传感方式开发自传感FRP筋实现结构全面监测和评估的SHM体系。为此,首先针对结构应变传感的需求开发一系列封装技术,将分布式传感光纤埋设进纤维复合材料(FRP),制备自传感FRP筋,大幅提升了光纤的传感性能、施工性和传感耐久性,扩大了其应用范围。随后,针对土木建筑结构具有体量大、杆件多、损伤局部发生等特点,提出了在这些损伤发生概率大的区域分布式布设传感器,进行全面监测,也即区域传感的理念。同时,通过纤维模型理论和动力参数分析理论建立结构健康诊断体系。最后,通过梁、柱的模型验证了所提出的结构监测和健康自诊断体系。研究结果表明,基于应变监测可以建立有效的SHM体系。
Based on the analysis of existing structural health monitoring (SHM), an SHM system for developing a self-sensing FRP bar by strain sensing is proposed to achieve a comprehensive structural monitoring and evaluation. Therefore, a series of packaging technologies are first developed according to the demand of structural strain sensing. The distributed sensing optical fibers are embedded in the fiber composite material (FRP) to prepare the self-sensing FRP bars, which greatly improves the sensing performance and workability of the optical fibers. And sensing durability, expanding its scope of application. Subsequently, in view of the characteristics of civil architecture such as large body mass, large number of bars and local damage, the paper puts forward the idea of distributedly arranging sensors in these areas with large probability of occurrence of damage so as to carry out comprehensive monitoring, that is, the concept of area sensing. At the same time, the structural health diagnosis system is established through fiber model theory and dynamic parameter analysis theory. Finally, the proposed structure monitoring and health self-diagnosis system is verified by the model of beams and columns. The results show that an effective SHM system can be established based on strain monitoring.