High prestressing of externally mounted CFRP plates for prestressed hollow-core slabs strengthening
Bibliographic record
Abstract
Strengthening concrete structures with externally prestressed carbon fiber reinforcement polymer (CFRP) plates has been proven to be an effective method to improve their serviceability and the ultimate performance. However, it has not been widely used in the field due to the challenges associated with the high prestressing levels and anchoring techniques. This paper presents an experimental investigation of the flexural behaviour of full-scale prestressed hollow-core slabs (PHCS) strengthened with externally bonded and unbonded prestressed CFRP plates under high prestressing levels, up to 72 % of the CFRP plate’s tensile strength, utilizing a novel field-applicable wedge anchorage system. Results indicated that strengthening with high prestressing levels led to an efficient use of the CFRP material and better utilization of its high tensile strength. The ultimate and cracking loads were increased by as much as 48.8 % and 25 %, respectively, for the strengthened slabs compared to the control slab. In addition, a significant enhancement by up to 145 % in ductility was observed for the slab strengthened at high prestressing levels compared to the control slab.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
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".