Concrete half joint bridges in New South Wales: challenges in risk management
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
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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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) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 0.001 |
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