Effects of ground motion duration on the seismic performance of a two-storey balloon-type CLT building
Bibliographic record
Abstract
The widespread availability of Cross-laminated timber (CLT) provides opportunities to extend the use of wood beyond traditional low-rise residential construction. Although previous studies have shown that ground motion duration impacts the collapse risk of structural systems, duration effects are not explicitly accounted for in current building codes, and information on the impact of ground motion duration on the seismic performance of CLT buildings is not available. This study aims to quantify the effects of long duration ground motions on a newly constructed two-storey balloon-type CLT building located in Vancouver, Canada. A three-dimensional numerical model of the building was developed in OpenSees. The shear wall and connections models were validated with test data. 24 pairs of long and short duration records with approximately the same amplitude, frequency content and the rate of energy build up were used for nonlinear dynamic analyses. The building was subjected to the earthquakes in its long (weak) direction. To assess the building’s collapse capacity, fragility curves were developed based on incremental dynamic analysis. The long and short duration motions on average resulted in interstorey drift ratios of 3.7% and 4.8%, respectively, before collapse, indicating that long duration motions are more likely to lead to structural collapse. Similarly, compared with short duration motions, long duration motions increased the probability of collapse by 7% due to the larger number of inelastic cycles. These results suggest that further research is required to further evaluate the effect of ground motion duration on the seismic performance of CLT buildings.
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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 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".