What does this research mean for the field?

End-anchoring prestressed carbon-fibre-reinforced polymer (CFRP) sheets on large reinforced concrete beams increases yield load by up to 215% and cracking load by 246%, although intermediate crack-induced debonding remains the dominant failure mode at high prestressing levels. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To evaluate how end-anchorage and varying prestress levels influence the bending capacity, ductility, and debonding failure of large reinforced concrete beams strengthened with carbon-fiber-reinforced polymer sheets.

September 8, 2026Proceedings of the Institution of Civil Engineers - Structures and Buildings

Flexural resistance of large RC beams retrofitted with anchored prestressed carbon-fibre-reinforced polymer sheets

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Authors

MGMohammadsina Sharifi Ghalehnoei NNNima Noormohammadi

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Overview

Numerical modeling demonstrates enhanced flexural capacity in reinforced concrete beams retrofitted with anchored prestressed composite sheets, highlighting persistent crack debonding risks.

Key Points

To evaluate how end-anchorage and varying prestress levels influence the bending capacity, ductility, and debonding failure of large reinforced concrete beams strengthened with carbon-fiber-reinforced polymer sheets.
Conducted finite-element numerical simulations of large-scale reinforced concrete beams strengthened along their lower face with prestressed carbon-fiber-reinforced polymer sheets.
Evaluated externally bonded reinforcement and externally bonded reinforcement on grooves attachment methods, calibrating the model with experimental data.
Retrofitted beams achieved up to a 215% increase in yield load, a 246% increase in cracking load, and a 125% increase in structural stiffness.
Increasing the sheet prestressing level from 20% to 30% of nominal strain increased ultimate load capacity by enabling the anchorage to secure higher prestressing forces.
Intermediate crack-induced debonding remained the dominant failure mechanism at high prestress levels, particularly when using externally bonded reinforcement on grooves.

Cite This Study

Ghalehnoei et al. (2026) studied this question.

synapsesocial.com/papers/6aa0091858e84d0ff5b47b74 https://doi.org/10.1680/jstbu.25.00144

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September 8, 2026Proceedings of the Institution of Civil Engineers - Structures and Buildings

Flexural resistance of large RC beams retrofitted with anchored prestressed carbon-fibre-reinforced polymer sheets

View Full Paper

Ask AI

Bookmark

Authors

MGMohammadsina Sharifi Ghalehnoei NNNima Noormohammadi

Discussion

Member takes

Overview

Numerical modeling demonstrates enhanced flexural capacity in reinforced concrete beams retrofitted with anchored prestressed composite sheets, highlighting persistent crack debonding risks.

Key Points

To evaluate how end-anchorage and varying prestress levels influence the bending capacity, ductility, and debonding failure of large reinforced concrete beams strengthened with carbon-fiber-reinforced polymer sheets.
Conducted finite-element numerical simulations of large-scale reinforced concrete beams strengthened along their lower face with prestressed carbon-fiber-reinforced polymer sheets.
Evaluated externally bonded reinforcement and externally bonded reinforcement on grooves attachment methods, calibrating the model with experimental data.
Retrofitted beams achieved up to a 215% increase in yield load, a 246% increase in cracking load, and a 125% increase in structural stiffness.
Increasing the sheet prestressing level from 20% to 30% of nominal strain increased ultimate load capacity by enabling the anchorage to secure higher prestressing forces.
Intermediate crack-induced debonding remained the dominant failure mechanism at high prestress levels, particularly when using externally bonded reinforcement on grooves.

Cite This Study

Ghalehnoei et al. (2026) studied this question.

synapsesocial.com/papers/6aa0091858e84d0ff5b47b74 https://doi.org/10.1680/jstbu.25.00144

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