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Compared to the bond-type anchor, the compression-type anchor, whichanchors the CFRP tendon by applying a compressive force on its surface, presents the advantages of not needing a curing period for the filler and to reduce the sleeve length by more than 30%. The fabrication of the compression-type anchor proceeds by changing the dimensions of the steel sleeve by hydraulic pressure, which means that the anchoring performance varies according to the region subjected to the compressive force at the surface of the CFRP tendon. Since the fabrication of the compression-type anchor is generally done uni-directionally, there is naturally some difference in the performance at the loaded end and free end. Accordingly, it is necessary to design the stress softening region to secure uniform anchoring performance at both ends. This study performs finite element analysis on 7 different shapes of sleeves with two types of taper based upon the dimensions of existing sleeves. From the analysis results, the design of the stress softening region of the free end is not possible by adjusting only the stress softening region but needs also to adjust the inner diameter of the sleeve so as to obtain similar stress softening regions in both loaded and free ends. For the sleeve with two tapers, similar stress softening regions could be achieved after compression by securing a stress softening region longer than 30 mm at the free end. This disposition was also seen to secure longer iso-stress region than the other parameters, from which it can be expected to acquire stable results during the test of the loaded and free ends.

An Analytic Study on the Identification of the Stress Softening Region of the Compression-type Sleeve for CFRP Tendons