Flexural Behavior of Carbon Fiber-Reinforced Polymer Partially Bonded Reinforced Concrete Beams with Different Anchorage Methods
Bibliographic record
Abstract
Carbon fiber-reinforced polymer (CFRP) is a widely used material for reinforced concrete (RC) beam strengthening.Because of exposure to severe environments and improper construction, CFRP sheets may separate from the bottom of RC beams.To analyze the influence of this type of interfacial defect on the mechanical properties of RC beams quantitatively and provide a reference for the rehabilitation of structures, this paper investigates the flexural properties of RC beams strengthened with partially bonded CFRP by experiments and analytical studies.To measure the degree of unbonded CFRP, a new parameter called the unbonded ratio was established, which is defined as the ratio of unbonded length to the total length of strengthening CFRP in the tension zone.Twenty-six RC beams were fabricated and tested in the present study, and the experimental variables were the unbonded ratio, thickness of the CFRP sheet, and anchorage method (vertical U-jacket, inclined U-jacket, and mechanical plate).The cracking load, ultimate load, load-midspan deflection curve, ductility, crack pattern, and failure modes of these specimens are discussed.Also, the coupling effect of the unbonded CFRP and anchorage method on the flexural performance of strengthened beams was investigated.Test results indicated that the ultimate load decreased with the increase of the unbonded ratio before the unbonded ratio reached its critical value.It was also found that the mechanical-plate anchorage and inclined U-jackets were superior to traditional vertical U-jackets in terms of load-carrying capacity and flexural stiffness and postponed the debonding of CFRP.Finally, a theoretical model for the ultimate load of RC beams strengthened with inclined U-jackets was proposed, which showed a good agreement with the test results.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.005 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".