海水干湿循环下碳纤维束锚锚固性能劣化试验研究OA

To investigate the degradation behavior of the anchorage performance of carbon fiber reinforced plas-tics(CFRP)under seawater erosion,tensile shear tests of the bond joints between anchor fan and CFRP sheets,as well as pull-out tests of the bond joints between anchor bolt and concrete,were conducted under seawater wet-dry cy-cles.The failure modes,ultimate loads,and ultimate displacements of the specimens were summarized with the varia-tion of wet-dry cycles,and the influence of adding short-cut carbon fibers to the resin material on the bond perform-ance was analyzed.The test results showed that with the increase of wet-dry cycles,the failure mode of the anchor fan-CFRP sheet specimens gradually shifted from partial delamination to complete delamination on the bond interface.The ultimate load of the anchor fan-CFRP sheet specimens increased by 17.6%after 240 wet-dry cycles,while the ultimate load of the anchor fan-CFRP plate specimens decreased by 42.79%.The ultimate displacement of the anchor fan-CFRP specimens initially increased and then decreased by 40%to 50%.The ultimate load of the anchor bolt-CFRP specimens increased after each wet-dry cycle,with an increase of 25.16%after 180 cycles.The failure mode of the anchor bolt-CFRP specimens gradually changed from conical concrete breakout to complete pull-out of anchor bolt.The bond performance of the specimens with additional short-cut carbon fibers was not significantly improved.