| Summary: | In offshore engineering, the pipe is the critical component for oil and gas transportation. Its integrity directly influences the transport of oil and gas. Steel strip reinforced thermoplastic pipe (SSRTP), as a new type of unbonded flexible pipe, has come into application in the marine resource transportation field because of its good mechanical performance. The severe and complex subsea conditions make SSRTP subjected to principal loading cases. To monitor the working condition of SSRTP, in this article, the possibility of Fiber bragg grating (FBG) monitoring has been discussed to achieve real-time measurement of hoop strain on the sheath under internal pressure. The experimental results are in good agreement with the finite element analysis (FEA) results, which indicates that hoop stain on the sheath can serve as a monitoring parameter and preliminarily realize the health monitoring of SSRTP with the help of FBG technology. Parametric analysis is further conducted to better understand the mechanical performance of SSRTP based on the proposed monitoring parameter. The results indicate that SSRTP takes better advantage of material properties, compared with the steel pipe with the same dimension; the hoop strain on the sheath is slightly decreased by the friction between layers, but is significantly affected by the geometry of SSRTP due to the change of the radial stiffness.
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