Study on Prestressed Concrete Beams Strengthened with External Unbonded CFRP Tendons

This study builds a refined finite element (FE) model to research the flexural behavior of a reinforced beam with prestressed CFRP tendons. The precision of the FE model is validated through a comparison with the experimental outcomes. The numerical findings align well with the experimental outcomes...

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Bibliographic Details
Published in:Materials 2024-09, Vol.17 (18), p.4622
Main Authors: Chen, Longlong, Qiang, Xuhong, Jiang, Xu, Dong, Hao, Chen, Wulong
Format: Article
Language:English
Subjects:
Accuracy
Concrete
Ductility
Failure modes
Investigations
Metal fatigue
Numerical analysis
Prestressed concrete
Prestressing
Reinforcement
Reinforcing steels
Strain gauges
Stress concentration
Tendons
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Summary:This study builds a refined finite element (FE) model to research the flexural behavior of a reinforced beam with prestressed CFRP tendons. The precision of the FE model is validated through a comparison with the experimental outcomes. The numerical findings align well with the experimental outcomes, encompassing the failure mode, load-deflection curve, load-strain curves of concrete, steel reinforcements and CFRP tendons. The variances between predicted values and experimental results are within 10%. Leveraging the verified FE model, an extensive parametric study has been carried out to examine the effects of various parameters, including the CFRP tendon prestress, the CFRP tendon diameter, the deviator layout, the anchorage height and the prestressing strand prestress. Leveraging the findings from the parametric study, some refined design recommendations are proposed for practical reinforcement applications: Increasing the CFRP tendon prestress in practical reinforcement designs is recommended; CFRP tendons with larger diameters are recommended for use in practical reinforcement designs; Employing a linear CFRP tendon profile for reinforcement is not considered optimal in practical applications; The prestress loss in the prestressing strands of PC beams should be considered in practice.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma17184622