Experimental study on the fatigue performance of corroded steel plate strengthened with externally bonded CFRP plates
Li Anbang1,2,3 Xu Shanhua1,2,3 Wu Cheng1,3 Nie Biao1,3
1. School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China;
2. State Key Laboratory of Green Building in Western China, Xi'an University of Architecture and Technology, Xi'an 710055, China;
3. Key Lab of Engineering Structural Safety and Durability, Xi'an University of Architecture and Technology, Xi'an 710055, China
Abstract： In order to investigate the fatigue performance of corroded steel plate strengthened with externally bonded CFRP plates, the fatigue tensile tests on sixteen corroded steel plates strengthened with CFRP plates were carried out. The effects of corrosion duration, CFRP stiffness, CFRP prestressing level, end anchorage, and fatigue stress amplitude on the fatigue performance, including fatigue failure mode, fatigue life and crack propagation, of the reinforced steel plates were studied. Test results show that externally bonded CFRP plates may significantly improve the fatigue life of the corroded steel plates, and for the corroded steel plates with the corrosion rate of 9.38%, 13.39%, 16.61% and 21.24%, the fatigue life of the reinforced specimens with double-sided patched CFRP plates and end anchorage may be increased by the factors of 18.4, 9.3, 8.9 and 11.4 respectively, compared with the unreinforced specimens. Tests results also indicate that the reinforcement configurations has a significant impact on the fatigue strengthening effect, the failure of bonding interface may be effectively delayed by end anchorage, and the crack propagation rate can be significantly reduced by increasing the stiffness of CFRP plates or adopting the prestressing.
