吉林大学学报(工学版) ›› 2016, Vol. 46 ›› Issue (6): 1867-1873.doi: 10.13229/j.cnki.jdxbgxb201606015

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Fatigue performance of RC beams strengthened with externally prestressed CFRP tendons

YU Tian-lai1, LIU Xing-guo1, YAO Shuang1, Muhammad Mansour2   

  1. 1.School of Civil Engineering, Northeast Forestry University, Harbin 150040,China;
    2.School of Civil Engineering,Sudan University of Science and Technology, Khartoum 999129, Sudan
  • Received:2015-06-05 Online:2016-11-20 Published:2016-11-20

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Abstract: The fatigue failure mode and anti-fatigue performance of Carbon Fiber-reinforced Polymer (CFRP) post-tensioned beams are systematically studied by fatigue test. The results show that, when fatigue failure occurs, there are no fractures on the steel bars and the external prestressed tendons, but the upper concrete is crushed. With the increase in the number of fatigue loading times, as the fatigue loading level S<0.43, the growth of CFRP tendon strain does exist but is not obvious; however, as S>0.43, CFRP tendon strain increases significantly. After certain number of fatigue loading times, the relationships between the steel strain, the concrete strain and the loading are nonlinear, indicating that the beams are damaged due to fatigue; while the relationship between the strain of CFRP tendons and the loading is linear. Under the same static loading, the higher the number of fatigue loading times is, the larger the strains of the steel bars, the concrete and the CFRP tendons are. Compared with the common steel reinforced concrete beams, when S=0.48 the fatigue life of the CFRP post-tensioned beam is increased by 30%.

Key words: road engineering, reinforced concrete beam, fatigue test, CFRP tendon, external prestressing, bridge reinforcement

CLC Number: 

  • U441
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