Superstructure replacement works for the Macdonald Suspension Bridge, Canada
Bibliographic record
Abstract
The Angus L. Macdonald Bridge, completed in 1955, connects Dartmouth and Halifax, NS, Canada. The suspension bridge is 762 m long, with a 441 m long main span. The bridge deck reached the end of its functional life and was replaced segment-by-segment during bridge weekend closures, with traffic using the bridge during the weekdays. New deck segments were fully prefabricated, including an initial layer of wearing surface, and erected in a way that allowed traffic to use the bridge immediately following replacement. Fabrication began in early 2015 and erection in late 2015. The last segment was replaced in 2017 February. Concurrently with the segment replacement, the entire deck was raised to its final profile (3 m at midspan) to allow for the increased shipping clearance. The hangers were then replaced. This paper describes some aspects of the superstructure fabrication, segment erection, and challenges encountered during erection. This paper describes investigation and rehabilitation work carried out since 2005. It includes some special investigations into low stress/high cycle fatigue testing of cracked wires and friction tests to refine the evaluation of broken wire redevelopment length. It seeks to provide lessons learned and guidance for suspension bridge owners on how to deal with similarly deteriorated cables.
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How this classification was reachedexpand
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) | 0.000 | 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) | 0.002 | 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 teacher head, 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".