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Study On FBG Sensing Technology-Based Fiber Reinforced Polymer Smart Stayed Cable Wire

Posted on:2011-09-04Degree:DoctorType:Dissertation
Country:ChinaCandidate:J Z LiFull Text:PDF
GTID:1118360302970390Subject:Vehicle Engineering
Abstract/Summary:PDF Full Text Request
Steel stayed cable has some disadvantages, such as easy corrosion, nonlinear effect and prone to vibration, which pose a great threat to the bridge. Thus optical fibre Bragg gratings sensing technology-based FRP smart stayed cables was proposed, which is the development trend of the future cables and the focus at home and abroad. Therefore this study has theoretical and engineering significance..Based on the mechanical and dynamic analysis of FRP stayed cables, the design goal is proposed. And several key problems on optical fibre Bragg gratings sensing technology-based FRP smart stayed cables bar are investigated in this dissertation. The main contents are as follows:1) Thorough research on temperature-strain entangling of FBG is done and experimented. Firstly, the theory of temperature-strain entangling is thoroughly analyzed. Secondly, based on these analyses, the temperature-compensating mechanism was proposed. At last, the sensor was designed, made and verified. The results show the sensor made has not only the temperature-compensating function but also the strain-enhancing function.2) The micro-technology of the FBG strain was investigated, which include the selection of packaging materials, design of the structure and packaging process. The results show that the sensor made partly realizes the temperature-compensating function, but has a strain-enhancing function.3) Optical fibre Bragg gratings sensing technology-based FRP smart stayed cables was investigated by in-situ composite theory. Thus several key problems, such as the interface-composite model, composite process of the FRP bar and performance examination, were studied. The numerical and experimental results show that the debonding of the FBG-FRP interface do not occur. At the same time, their performance in tensile, bond and flexural tests is examined to assess the effectiveness of these smart FRP bars and can satisfied the requirements of the stayed cables. The regularity of the low-frequency damping performance of FRP was attained in the working range of stayed cable. The pultrusion technology was established to modify to incorporate FBG sensors within FRP bars to provide smart FRP bar for achieving the dual purpose of structural strengthening and strain monitoring.
Keywords/Search Tags:fiber Bragg grating (FBG), cross-sensitivity, strain sensor, fiber reinforced composite, stayed cable
PDF Full Text Request
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