Remaining fatigue service life of the Hillsborough River Bridge in PEI, Canada
Bibliographic record
Abstract
The Hillsborough Bridge is Prince Edward Island Department of Transportation and Infrastructures (DTI’s) signature structure, which connects the capital city of Charlottetown with the bordering community of Stratford and southern portion of Kings County. It is the busiest section of highway in the province with a peak average annual daily traffic (AADT) of about 40,000 vehicles per day (vpd). Any service interruption at this location would necessitate a 57 km detour, causing significant user costs and delays. Originally a ferry crossing, it was replaced by a railway bridge in the early 1900, supported on 11 masonry piers with a turnstile (or swing) span to allow navigation of the Hillsborough River. This was replaced in 1962 with a truss structure, which carried two-lanes of automobile traffic. The deck truss still exists today. Several modifications to the truss structure have since been completed including: widening of the structure to four lanes by used of a variable depth trapezoidal box structure, as well as strengthening some transverse members and truss joints to aide in the installation of municipal services and an Active Transportation Corridor. Harbourside Engineering Consultants Ltd. (HEC), with the support of DTI, are conducting a Remaining Fatigue Life analysis of the deck-truss structure (the scope does not include the box girders). Due to the unique nature of the structural system in place, the analysis requires detailed modelling of the elements and connections, including the newer trapezoidal box details and connection to the deck truss. This paper details the approach, including the use of a model calibrated using structural response data from controlled loadings, in determining the remaining fatigue life for the truss portion of the Hillsborough River Bridge per CSA S6:19 (Canadian Highway Bridge Design Code).
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.002 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.006 | 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 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".