Concrete half joint bridges in New South Wales: challenges in risk management
Bibliographic record
Abstract
Half joints were introduced into bridges to simplify design, construction and allow for bridge movements. The sudden collapse of a concrete half joint overpass bridge in Montreal, Canada, after about forty years in service, prompted concern within the bridge community regarding the inherent risks involved in this type of bridges. This paper gives an outline of Road and Traffic Authority's (RTA) different type of half joint bridge stocks and examines in detail the challenges faced by RTA in maintaining these bridge stocks for ever increasing road traffic. It also discusses the maintenance strategy currently under development at RTA to sustain these bridges for future generation. Recently a detailed analytical study was carried out at RTA for a half joint concrete bridge in Cooma, New South Wales. This paper highlights how Finite Element based techniques can be utilised to arrive realistic wheel load transfer into individual half joints and compares these results against the traditional code based Distribution Factor methods. It also addresses how concrete stress field based strut and tie modelling can be used to assess the resistance capacities of these half joints at the Ultimate Limit State.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| 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".