Effects of delamination on the response of slab-column connections in parking structures
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Bibliographic record
Abstract
The risk of progressive collapse of reinforced concrete parking structures due to punching shear failure of a slab-column connection can be increased by the corrosion of the top flexural reinforcement and delamination caused by exposure to de-icing salts. Although considerable research has been conducted regarding the punching shear failure of slab-column connections, there has been little research regarding the effects of corrosion of reinforcement and delamination on the punching and post-punching shear responses of the connections. Three slab-column connections were designed, constructed, and tested at McGill University to study: (1) the effects of significant delamination on the punching and post-punching responses of the specimens, and (2) the effects of structural integrity reinforcement on the post-punching behavior of delaminated specimens. A plastic sheet was cast below the top mat of reinforcement of each specimen to simulate extensive delamination of the reinforcement. The experimental results were compared to the experimental results of companion specimens tested by others, predictions using the CSA A23.3-04 design provisions, and predictions from an analytical model developed for the post-punching response. The presence of structural integrity reinforcement allowed for the development of a post-punching shear resisting mechanism, producing a significant increase in both the post-punching shear resistance and the ultimate deflection of the specimen. Extensive delamination caused decreases in the pre-punching stiffness, punching shear resistance, and post-punching shear resistance of the specimens. The analytical model provided relatively accurate predictions of the progressive breakout of each layer of reinforcement during the post-punching shear response for the specimens without delamination. However, the predictions for the delaminated specimens were less accurate, probably due to the combination of damage from both delamination and from the progressive damage during breakout of the reinforcement. The model under-estimated the ultimate deflection of the specimens.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 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) | 0.000 | 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 it