Study And Application Of FBG Intelligent Materials And Structures

The intelligent material is an intellectualized material system that has several basic functions such as sensing, actuating, controlling and so on. The intelligent material has represented the most active and advanced development direction on materials science, which has become a hot spot of research in the scientific fields.The structure health monitoring is the significant theoretical and realistic subject that is urgent to be solved in the civil field. The realization of structure health monitoring is of momentous current importance to safeguard of the significant civil engineering projects such as bridges, the extra-high buildings, large-span space structures, large-scale dams, nuclear power stations, pipe network systems for oil transfer, water supply, air feed and so on.The research on the intelligent materials applied in structure health monitoring, is the most challenging topic in the 21st century. The study on the health monitoring and safety evaluation within the whole life cycle of the huge engineering structures is a popular subject all over the world and has great social significance and economic benefits.The intelligent material of fiber optic grating is the advanced sensing material developed in the recent years. It has effectively overcome the shortcomings of the current conventional sensing system in the long-term stability, durability and the distribution scope. It has most hopefully satisfied the technology needs of the structure monitoring in the modern engineering on the high accuracy, the long-distance, distribution and the long-term specification. It, moreover, has many advantages over the traditional technologies. One of the key works to realize the health monitoring of structure fundamentally is to study and develop a new kind of fiber optic grating intelligent materials whose durability and stability can meet the engineering needs.Financially supported by the National Natural Science Fund, National 863 Program, Key Research Projects of Hubei Province, and under the elaborate guidance of my tutor, based on the sensing mechanism of fiber optic grating sensor, the constitution, the function, the monitoring content, the method and the realization channel of the structure health monitoring system in large-scale civil engineering have been studied in the thesis. New optical fiber grating sensor for force measurement of anchor cable (OFBFMAC) has been developed based on experiments, which was successfully applied in the health monitoring system of Wuhan Qing Chuan Bridge. The results measured by the OFBFMAC are basically consistent with those of theoretical analysis. The method of optimized arrangement of sensors in large-scale civil engineering structures while monitoring their health conditions, the criterion to discriminate their health conditions and the method of gathering and post-processing the data monitored at the scene have been studied and summarized. It is of momentous importance to realize the intellectualization, network and systematization of structure health monitoring to large-scare civil engineering. Finally, combining the experiment and the application of structure health monitoring to the different types (under construction, being constructed, reinforcement) of significant civil engineering, the technology of preparation, seal, buries, cementation, installment, protection craft for fiber optic grating sensors, the design and system integration technology for fiber optic sensing network have been explored in the aspects of materials, components and structures. The parts of data from the monitoring systems have been contrasted and analyzed with the ones from the conventional measurement. The application has been realized to use fiber optic grating sensors in the important engineering construction.The several related research achievements in the thesis were evaluated. They were used in several huge engineering and became parts of the second class of the National Scientific and Technological Prize.