Interstorey Drift Performance of Timber Beam-Hanger Connections
Bibliographic record
Abstract
This thesis is split into two distinct sections. The first describes the design of a testing setup for applying simulated earthquake loads to a timber beam-hanger connection, and the second evaluates the performance of beam-hanger connections under this loading protocol. Chapter 2 describes existing testing protocols for subjecting timber connections to cyclic loading. The specific details of the current research are then outlined, including the loading protocol to allow for the application of interstorey drifts, and the details of the two specific beam-hanger connections tested for this research (“dove tail” and “bolted plate”). The structural design of a testing frame is then described and the final product of a steel wide flange section, W460x128, with 10mm plates is detailed. A test was then completed to evaluate the performance of the new testing frame. It was determined that the frame performed adequately by ensuring that the deflections incurred during the loading are primarily experienced by the connections. Chapter 3 describes the laboratory testing of beam-hanger connections under applied interstorey drift deflections. The performance of the connectors was evaluated and it was determined that the Ricon Prototypes exhibited a combined tension and shear fracture of the collar bolts at an average shear of 210 kN and a rotation of 1.33°. The Megant connections failed due to combined tension and pull-out failure of the wood screws, and sustained higher shear, moments and rotations than the Ricon Prototype connections. The interstorey drift values at failure were also compared to the maximum interstorey drift value from the National Building Code of Canada (2.5%) and it was observed that the Megant 310x150 and 550x150 are the only connections that surpassed this value.
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.004 | 0.001 |
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".