Design of the Canada Line Extradosed Transit Bridge
Bibliographic record
Abstract
In 2005, TransLink procured the new Canada Line rapid transit system that will connect Richmond, the Vancouver International Airport and downtown Vancouver. The Line is scheduled for completion in 2009. An extradosed precast segmental box girder bridge was designed for the longest span on the Line, which crosses the Fraser River North Arm. The North Arm Bridge which carries two rail tracks and a suspended walkway/bikeway, is 562 m long with a 180 m main span, 139 m side spans and 52 m transition spans. A single plane of extradosed cables anchored to two 22 m tall pylons supports the main and side spans. New to North America, this bridge form provided an appropriate solution considering the design constraints. In this paper, the extradosed bridge form is introduced prior to describing the design constraints that led to its use for the North Arm Bridge. The analysis of dynamic train-structure interaction, cable anchorage details and the precast segmental composite steel/concrete pylons are also described.
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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 | 0.000 | 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 | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.007 | 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".