The Canadian Highway Bridge Design Code Approach to the Design of Composite Beams and Girders
Bibliographic record
Abstract
In September 2000, a new Highway Bridge Design Code, based on limit states design principles, will be re-established for all of Canada. The highlights of and rationale for the design provisions for composite beams and girders in this code are presented. These provisions have been greatly simplified and rationalized as compared to previous codes. A unified approach is proposed for evaluating the factored moment resistance of Class 1, 2 and 3 steel sections (plastic, compact and non-compact sections, respectively), and stiffened plate girders. Composite beams and girders with steel sections, symmetrical or unsymmetrical with respect to the flexural axis, are treated similarly. An equivalent plastic stress distribution technique, which is achieved by neglecting portions of the web, is used for the evaluation of the factored moment resistance of the most slender sections in positive moment regions. This method was calibrated against a more precise but more cumbersome elasto-plastic stress distribution technique, as well as against existing code recommendations. The factored moment resistance of Class 3 (non-compact) sections and stiffened plate girders in negative moment regions is the only resistance based on a linear stress distribution at first appearance of yield in the steel section.
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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 | 0.003 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.003 | 0.002 |
| Scholarly communication | 0.002 | 0.001 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.010 | 0.003 |
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".