Fatigue behaviour of the bond interface between carbon fibre‐reinforced polymer sheets and concrete

Externally bonded carbon fibre‐reinforced polymers (CFRPs) have been applied to retrofit and strengthen civil structures. In this study, four‐point bending beams were manufactured and tested to examine the fatigue behaviour of the CFRP–concrete interface. The results indicated that the specimens exh...

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Bibliographic Details
Published in:Fatigue & fracture of engineering materials & structures 2020-09, Vol.43 (9), p.2116-2129
Main Authors: Wei, Mu‐Wang, Xie, Jian‐He, Huang, Pei‐Yan, Huang, Kun‐Hong
Format: Article
Language:English
Subjects:
Bending fatigue
Carbon fiber reinforced plastics
carbon fibre‐reinforced polymer (CFRP)
Concrete
Cyclic loads
Debonding
externally strengthened concrete
fatigue behaviour
Fatigue life
Fatigue strength
Fatigue tests
Flexural strength
Life prediction
Modulus of rupture in bending
Prediction models
Retrofitting
Shear stress
shear stress–slip relationship
Sheets
Static loads
Ultimate loads
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Summary:Externally bonded carbon fibre‐reinforced polymers (CFRPs) have been applied to retrofit and strengthen civil structures. In this study, four‐point bending beams were manufactured and tested to examine the fatigue behaviour of the CFRP–concrete interface. The results indicated that the specimens exhibited debonding failure in the concrete beneath the adhesive layer under static loading. However, when cyclic loads were imposed on the small beams, debonding failure may occur in the adhesive layer. Moreover, fitting expressions were proposed to predict the shear stress–slip relationship between the CFRP sheets and concrete and the flexural strength of the CFRP‐strengthened beams under static loads, and good agreement with the test data was obtained. Finally, a fatigue life prediction model was also presented to capture the fatigue life of the CFRP–concrete interface under cyclic loads. The calculation results showed that the fatigue strength of the CFRP–concrete bond interface was approximately 65% of the ultimate load capacity.
ISSN:8756-758X
1460-2695
DOI:10.1111/ffe.13291