Research Of Cable Force Recognition Based On Fiber Optical Grating Technology

Cable force monitoring has been an important topic in the field of structural health monitoring, and identification of large-span cable force flexible cable structure currently more widely applied, structural health monitoring is a hot topic in the field. Understand the structure of the construction, operation process of the situation by force and prestressed cable system is safe, reliable and has been the design, construction and scientific research departments concern.In recent years, the fiber grating sensor networks have applied to safety monitoring of many large structures. Fiber Bragg grating(FBG) sensors in addition to a common optical fiber sensor light weight, corrosion resistance, anti-electromagnetic interference, the use of safe and reliable, but also has a small probe size, strong anti-interference ability wavelength modulation, set the sensing and transmission in one, has strong multiplexing capability, ease of composing sensor network, extensive measurement object, easy to realize the unique advantages of synchronous multi-parameter sensing measurements.Based on fiber grating sensing principle will be applied to identify a large span cable force of cable structure, work was carried out the following aspects:1. discussion of the current commonly used cable force monitoring methods, and the use of advantages and disadvantages. Discusses the basic principles of cable force measurement based on fiber grating sensing technology, and analyzes its characteristics.2. the proposed bilateral anchor head laying fiber grating sensor cable force monitoring program.3. the proposed determination FBG strain sensor based method laid anchor position at the head of the finite element analysis results.4. launched a series of benchmark tests to verify the feasibility of the method and get cable force and wavelength variation linear fitting relationship Yueqing stadium as the technical basis for health monitoring.5. the method is applied to the stadium Yueqing cable force monitoring, monitoring results for the overall state of Yueqing stadium provided an important basis for evaluation.6. combined with actual monitoring data Yueqing Stadium on FBG strain correction techniques to monitor the value affected by temperature sensor made a preliminary study and exploration.