Rotated-Ellipse Arch Pedestrian Bridge for the Calgary West Light Rail Transit Extension Project
Bibliographic record
Abstract
As part of the Calgary West Light Rail Transit (LRT) project, the existing pedestrian overpass crossing Bow Trail SW, west of 24th Street SW, was replaced to provide a widened roadway and LRT right-of-way. An increase in vertical clearance was also necessary for the LRT power propulsion system catenary wires. The project-wide architectural concept of a rotated ellipse was incorporated into the bridge design through the ellipse shaped arches with the pipe components rotated by 10 degrees. The two pipe arches were also inclined inwards to further enhance the aesthetics. The bridge utilizes pipe arch as the main structural members, providing a main span length of over 50 m and a top-of-arch height of approximately 16m. The north abutment continues the elliptical theme by carrying the curve design through the exposed portion of the arch foundation wall. This paper presents the opportunities and challenges experienced throughout design, fabrication, erection and construction. The design had a focus on engineering solutions developed by the design-build team to minimize potential risks during construction.
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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 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.015 | 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".