Punching shear failure behaviors of unbonded prestressed slab-column connections: Numerical investigation and code comparisons
Bibliographic record
Abstract
Reinforced concrete slab-column (RCS-C) structures are a popular choice due to their flexible layout and space-saving characteristics. However, due to the absence of beams, slab-column structures are prone to developing cracks or noticeable deformation over long-term use. Therefore, the unbonded prestressed slab-column (UBPS-C) structure has become a prevalent solution because it can effectively address the aforementioned issues and is convenient to construct. The connection between the slab and column is the most critical area in slab-column structures. However, construction-stage stacking or service-life overloading may induce punching shear failure in these connections, posing significant risks to both human safety and property integrity. In this study, numerical models of RCS-C connections and UBPS-C connections were developed to investigate their structural behavior and failure mechanisms under punching shear. There is no transverse reinforcement or shear reinforcement in the floor slab. Comparative analysis reveals distinct failure patterns that RCS-C connections demonstrate conventional conical punching failure, whereas UBPS-C connections exhibit a unique peripheral shear failure characterized by circular damage propagation along the outer perimeter. The prestressing tendons are shown to significantly improve both load-carrying capacity and structural ductility. Furthermore, an evaluation of different design codes, including GB 50010-2010 (China), ACI 318-19 (America), CSA A23.3-04 (Canada), Eurocode 2 (EN 1992-1-1) (Europe), and JSCE 15-2007 (Japan), for punching shear resistance prediction, was conducted in the present study. Subsequently, the corresponding suggestions were proposed. GB 50010-2010 is the most conservative, thereby suggesting that the factors should be increased or the effect of reinforcement should be introduced. For ACI 318-19 and CSA A23.3-04 , it is recommended to reduce the upper limit of the prestressing terms to improve performance under high prestressing conditions. The increase in the contribution of prestressing in Eurocode 2 could be considered to obtain superior precision for prestressed slab-column connections. JSCE 15-2007 has been shown to overestimate the positive effects of concrete and reinforcement.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".