Application of SRP Composite Sheets for Retrofitting Reinforced Concrete Beams: Cracking and Tension Stiffening
Bibliographic record
Abstract
This paper presents the contribution of steel-reinforced polymer (SRP) composites to the serviceability of reinforced concrete beams when retrofitted, with particular emphasis on cracking behavior and tension stiffening. SRP composite sheets, consisting of high-carbon steel unidirectional fabrics embedded in epoxy resin, provide high tensile strength and modulus at a reasonable cost. Six reinforced concrete beams, five of which are retrofitted using various widths of SRP sheets with or without end anchorage, are tested in three-point bending to examine their flexural performance, including crack width and depth progression, crack patterns, flexural rigidity, and tension stiffening. A 3D non-linear finite element analysis is conducted and compared to the code provisions and experimental findings. The trend of crack width progression of the SRP-retrofitted beams includes an almost linear response with respect to the SRP strain development. Clear differences in crack spacing are observed between the mid-span and shear-span regions of the test beams. The end anchorage significantly improves flexural rigidity and narrows the crack spacing of SRP-retrofitted beams. A characteristic area, including the tension stiffening factor, is proposed to evaluate the contribution of SRP composites to the flexural rigidity of SRP-retrofitted beams.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 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) | 0.000 | 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 teacher head, 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".