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Fatigue crack propagation behaviour of RC beams strengthened with prestressed CFRP under cyclic bending loads
Author(s) -
Guo Xinyan,
Huang Kainan,
Huang Peiyan,
Zheng Xiaohong,
Zhao Chen
Publication year - 2019
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/ffe.12924
Subject(s) - materials science , structural engineering , beam (structure) , fracture mechanics , bending , crack closure , stress intensity factor , composite material , engineering
Numerical and experimental methods were applied to investigate the fatigue crack propagation behaviour of the reinforced concrete (RC) beams strengthened with prestressed carbon fibre laminate (CFL). On the one hand, a theoretical analysis method was presented to calculate the stress intensity factor K of the main crack on RC beam strengthened with prestressed CFL. On the other hand, fatigue crack propagation tests were carried out to obtain the crack propagation rate on RC beams strengthened with CFL, which had different prestressing levels (0%, 15%, and 22%). For accurate description of the fatigue crack propagation and fatigue life prediction, the digital image correlation method was used to capture the fatigue crack pattern. Based on the numerical and experimental method, a modified version of Paris' law was proposed. Compared with RC beams strengthened with nonprestressed CFL, the main crack propagation rates on RC beams strengthened with prestressed CFL having prestressing levels of 15% and 22% were decreased by 28% and 33%, respectively. The effectiveness of the proposed modified version of Paris' law was verified.