EFFECT OF VERTICAL GROUND MOTIONS ON SEISMIC ISOLATION DESIGN OF THE CANADIAN PARLIAMENT BUILDING
Bibliographic record
Abstract
The ongoing restoration of Canada's Parliament Building, a prominent heritage building, includes the implementation of seismic isolation to enhance its seismic resilience. With its 6-story Centre Block featuring stone and brick walls, steel columns, and unreinforced concrete foundations, as well as the vulnerable 92 m tall Peace Tower supported by unreinforced concrete piers, addressing seismic risk is crucial. Approximately 580 isolators, including elastomeric bearings and flat sliding bearings, are utilized in the seismic isolation system to achieve cost-effective retrofitting while preserving the building's heritage characteristics. When complete, it will be one of the largest seismically-isolated heritage buildings in North America. A comprehensive three-dimensional analytical model was utilized to conduct detailed nonlinear time history analyses, accurately capturing significant mass and stiffness irregularities within the structure. Two sets of 11 ground motion records were carefully selected—one scaled for the short-period range of the design response spectrum, representing nearby earthquakes of smaller magnitude, and the other for the long-period range, representing larger magnitude distant earthquakes. A site-specific vertical target response spectrum was developed, and scaling factors for the vertical ground motion component were determined independently to ensure compatibility with the vertical spectrum. This paper focuses on investigating the impact of the vertical component of ground motions on the shear demands of the superstructure walls and piers within the isolated structure. Notably, the results reveal a significant increase in shear demands for the superstructure walls due to the vertical component of short-period ground motions, which may not be effectively attenuated by the isolation system. These additional induced shear demands primarily occur within the frequency range associated with the vertical vibration frequency of individual floors and the global vertical mode linked to the overall vertical stiffness of the isolation system. A comparison of shear demands with and without the vertical component highlights the importance of considering it in the analysis, assessment, and design of seismically-isolated heritage structures. Despite the increased shear demands, the seismic isolation system effectively reduces induced base shear in the walls compared to conventional retrofit methods for fixed base structures.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 teacher head, 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".