SEISMIC DESIGN OF DISCONTINUOUS RC SHEAR WALLS IN TOC OVERBUILDS FOLLOWING PROVISIONS IN NBCC 2020
Bibliographic record
Abstract
The principle of transit-oriented communities (TOC) is to integrate transit, residential, and commercial spaces, enhancing city neighbourhoods and creating more complete places to live, work and play. The city of Toronto is expecting development of several TOCs in the next 10 years alongside the delivery of new rapid transit projects. In some cases, a TOC building can be an overbuild, with its structure built above the transit station. This can lead to some of its reinforced concrete shear walls being discontinued at the station roof. This paper describes the seismic design for one such prototype 27-storey reinforced concrete TOC structure supported at level 3 by the transit infrastructure. The study shows the design is governed by the requirement in NBCC 2020 to prevent the formation of a weak storey, where the storey below must have a strength greater than that of the storey above. A methodology is presented which can be used to quantify storey shear strength. The approach helps determine if additional strength is required in the station structural elements to prevent the formation of a weak storey. This study finds that for the prototype structure, the resulting design forces to meet the weak storey requirement far exceed those determined following traditional linear dynamic analysis results.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".