Extending the Life of the Angus L. MacDonald Suspension Bridge
Bibliographic record
Abstract
The Angus L. Macdonald Suspension Bridge crosses Halifax Harbour and connects Dartmouth and Halifax in Nova Scotia, Canada. The bridge was opened for traffic in 1955. The overall length of the bridge, including approaches, is 1,347 m (4,419 ft), and the suspension bridge is 762 m (2,500 ft) long. After almost 60 years of service, the aging bridge deck is experiencing significant corrosion problems and is reaching the end of its service life. Therefore, the owner, Halifax Harbour Bridges, decided to replace the entire suspended superstructure including the hangers. Bridge inspections showed that all parts of the bridge that are not being replaced (main cables, towers, cable bents and foundations) are in good condition and expected to have a long life. The designs of the new bridge superstructure and its replacement sequence have been completed. Safety of the public and minimization of traffic disruption have been the central themes driving the design. The entire suspended structure will be replaced sequentially during night or weekend closures. The bridge will be open for traffic during each working day. An unusual feature of the project is that the Owner's Engineer performed a detailed step-by-step analysis of the erection sequence, has designed some of the key erection equipment, and is providing necessary forces and adjustments to the Contractor for his use during erection. The reason for performing analysis that is normally in the Contractor's scope is to reduce the risk to the owner in terms of cost and delays. Following the replacement of deck segments, the deck will be raised to increase the navigation channel clearance by 2.1 m at midspan. Dehumidification of main cables is being considered in order to extend their service life.
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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 | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.002 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.006 | 0.002 |
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".