11.04: Examination of the Canadian provisions for the seismic stability of steel structures
Bibliographic record
Abstract
ABSTRACT This article presents the seismic stability provisions of the CSA S16 design standard for steel structures in Canada. These provisions include notional lateral loads as well as lateral load amplification for P‐delta effects evaluated at maximum lateral displacements including inelastic response. The impact of these provisions is examined through nonlinear response history analyses performed on single‐degree‐of‐freedom models representing steel braced frames for buildings varying from 1 to 15 storeys in height. Buckling restrained braced frames and concentrically braced frames are investigated. The structures are located in eastern and western seismic regions of Canada to account for the difference in anticipated ground motion signature. For each location, firm ground and soft soil conditions are considered. The results show that current code provisions for seismic are sufficient to ensure stable seismic response of structures located in eastern Canada where ground motions are richer in high frequencies. Structural collapse was observed for one third of the structures located in western Canada. Most failures occurred for taller buckling restrained braced frames subjected to long duration subduction interface earthquakes. Collapse also took place for low‐rise concentrically braced frames.
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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 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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 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".