Experimental investigation and damage evaluation of a novel bond type anchorage for carbon fiber reinforced polymer tendons

The bond type anchorage is most suitable for anchoring carbon fiber reinforced polymer (CFRP) tendons, but its shape causes stress concentration. In addition, the failure modes of bonded anchors are difficult to observe and the damage process is difficult to analyze. The aim of this study was to address the above problems. To relieve the stress concentration, a novel arcuate-cone bond type anchorage was designed in this study. The failure modes and load-slip curves were obtained by tension tests on a group of anchors. The test results indicated that the stress concentration can be effectively alleviated. Acoustic emission technique was used to monitor the damage process of bond type anchorages under tension load. By analyzing the acoustic emission data, the damage process of bond type anchorage can be divided into three stages and the different failure modes can be identified. Finally, the failure mechanism of bonded anchorages was discussed based on the test results and monitoring data.