In this study, we examined the effect of increasing the diameter of the CFRP strand on the structural performance of the end fixing structure with the aim of further expanding the application of the ...end fixing structure in the CFRP strand (6φ). For verification, the end fixing structure of CFRP strand (9φ) was formed, and a pull-out test and cross-sectional observation by X-ray CT were performed. As a result, 9φ and 6φ showed the same structural performance by increasing the shortest distance from the through hole of the CFRP socket to the outermost end of the socket.
In this study, we proposed a method to determine the frictional resistance by pushing the CFRTP socket at a temperature above Tg and changing its shape without heating it to the melting temperature. ...Since the surface of the strand and socket were heated to a temperature above Tg, it was confirmed that they were bonded, and the initial behavior was adhesive resistance. However, pull-out tests and observations using CT and digital microscope have confirmed that the frictional resistance after yielding does not cause brittle fracture.
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