Influence of Middle Member Thickness on Properties of Double-Shear Nail Joints
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Bibliographic record
Abstract
For three-member nail joints under double shear loading, the Canadian timber design standard specifies a minimum thickness of the middle member of eight times the diameter of the nail (8d). This requirement has created difficulties in the specification of midply shear wall because of the use of the relatively thin wood-based sheathing as middle member in the sheathing-to-lumber joints. The objective of this project was to evaluate if the European Yield Model adopted in the Canadian timber design standard can still provide acceptable prediction of strength and failure mode of double-shear nail joint that has middle member thickness less than 8d. Six groups of double-shear nail joints, covering two nail sizes and three sheathing thicknesses, were tested under both monotonic and reversed cyclic loads. Six parallel groups of single-shear nail joints were also tested. The effect of nail penetration into the point-side member was investigated through testing of two groups with different nail lengths with all other parameters being equal. The test results show that the European Yield Model can still be used to estimate the strength and failure mode of double-shear nail joints when the center member has a thickness much less than 8d. Therefore, a value of 2.5d is recommended on the basis of this test project. The nail penetration into the point-side member does not affect the strength of joints when the penetration length is more than 5d.
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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 | 0.000 |
| 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) | 0.000 | 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 it