Parametric Effects on the Evaluation of an Impact-Damaged Prestressed Concrete Bridge Girder Repaired by Externally Bonded CFRP Sheets
Bibliographic record
Abstract
An AASHTO Type-III precast/prestressed girder that was extensively damaged by truck impact was used to explore the adequacy of a repair using externally bonded fiber reinforced polymer (FRP) composites. This paper analytically investigates the evaluation procedure of such repaired prestressed bridge girder that can be applied to bridges with similar vehicle impact conditions. Few parameters were investigated in this study, including (i) the effect of horizontal resistance of elastomeric bearing supports, (ii) the presence of barrier wall and sidewalk, and (iii) live load distribution factors obtained from Finite Element Analysis (FEA) compared to the simplified method prescribed by the Canadian Highway Bridge Design Code (CHBDC). FEA showed that support horizontal resistance has negligible effects on live load distribution factors for shear, Fv, while it has considerable effect on live load distribution factors for moment, Fm. The live load distribution factors Fm and Fv obtained from FEA were observed to be all smaller than those prescribed by CHBDC showing that the approach taken by CHBDC is conservative for the studied bridge. Fm and Fv of external girders obtained by FEA were as much as 30% and 40% less than those of CHBDC. Inclusion of barrier wall and sidewalk in the analysis showed an additional 18% reduction for Fm, with insignificant effect on Fv. The live load capacity factor as the safety indicator in the bridge evaluation was calculated analytically by Load and Resistance Factor Method and Mean Load Method and then correlated with experimental findings of proof load test on the repaired girder.
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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 | 0.001 | 0.001 |
| 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 | 0.001 |
| 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".