Bibliographic record
Abstract
This dissertation investigates a novel approach to seismic design of eccentrically braced frames. The proposed design procedure incorporates non-linear time-history analysis directly into the design process. Member forces introduced by a chosen earthquake record are monitored throughout the time history, and the frame elements are selected so that they have adequate resistances for peak forces. This process is carried out iteratively. For the earthquake records used, the proposed procedure leads to a design which achieves desired seismic behaviour, characterized by the stable elastic response of columns and braces, and with inelastic action confined primarily to links. The procedure was implemented by means of three computer programs, two of which were developed as part of this study. The sensitivity of the procedure to initial section selection was studied and a methodology to obtain an appropriate site-specific earthquake record to use in the analysis was proposed. The application of the procedure was illustrated through examples of three Chevron-type EBFs, these having four, eight and fourteen storeys and being located in Victoria, B.C. It was demonstrated that the proposed design method is simple and efficient, and can be used either as an alternative design method or in combination with current design practice. Analytical results indicate that frames designed using this alternative approach have improved behaviour compared to those designed in accordance with the present Canadian design requirements, in particular regarding the response of columns and braces. In the second part of the study, the analytical tools developed were used to further investigate and enhance the understanding of seismic behaviour of EBFs. Modifications of seismic design requirements for EBFs, suitable for incorporation in the Canadian Standard for design of steel buildings, CSA/CAN-S16.1 were examined. The inelastic response of an eight-storey EBF designed following these modified requirements is compared to that of a corresponding structure designed using the iterative procedure. Attention was further directed to seismic force profiles, magnitudes of axial forces and moments for use in the design of columns, force modification factors and the relationship between inelastic inter-storey drifts and inelastic link deformations.
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| 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".