| Citation: | QIANG Xu-hong, WU Ya-peng, JIANG Xu, LIN Zhi-ping. Repair methods for fatigue cracks in bridge diaphragms based on CFRP sheets and SMA/CFRP composite patches[J]. Journal of Traffic and Transportation Engineering, 2024, 24(1): 171-184. doi: 10.19818/j.cnki.1671-1637.2024.01.011
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In order to solve the fatigue cracking problem of the diaphragm arc-shape cutouts in the orthotropic steel bridge decks due to vehicle-induced vibration and cyclical wheel load under prolonged service conditions, two kinds of reinforcement methods, including carbon fiber reinforced polymer (CFRP) sheets covering crack-stop holes method and shape memory alloys (SMA)/CFRP composite patches covering crack-stop holes method which introduced prestress by activating SMA were proposed. The static and fatigue loading tests were carried out on the repaired diaphragm specimens, the corresponding finite element models were established for numerical simulation and parameter analysis of different reinforcement methods, and the repair effects of different reinforcement methods were compared. Research results show that, after bonding CFRP sheets and SMA/CFRP composite patches on the basis of crack-stop holes, the stresses at the hole edges of diaphragms reduce by 12.46% and 44.90%, respectively, and the fatigue lives of diaphragms repaired with CFRP sheets and SMA/CFRP composite patches are 2.57 and 5.07 times that of diaphragms repaired simply with the crack-stop holes, respectively. Both the two methods can effectively improve the local stiffnesses of the cracked region, and alleviate the stress concentration and improve the fatigue performance of the cracked diaphragms. When repairing with CFRP sheets, increasing the number of CFRP sheets layers can significantly reduce the stress and stress concentration on the diaphragm. To guarantee the bonding performance between CFRP sheets and steel plates, however, it is appropriate to apply 2-3 layers of CFRP sheets in practical applications. When repairing with SMA/CFRP composite patches, the stress concentration on steel plates exhibits an approximately linear decreasing trend with the increase of SMA wire actived stress. Consequently, the repair effect can be effectively enhanced by increasing the SMA wire actived stress in practical engineering.
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