The prediction of the flanking transmission in constructions of hollow concrete block masonry walls connected to precast prestressed concrete hollow core floors
Bibliographic record
Abstract
A common construction technique for multi-story buildings is to build walls of hollow concrete block masonry which are rigidly connected to floors of precast prestressed concrete hollow core slabs. The airborne flanking transmission for buildings of this construction must be determined to predict the apparent sound transmission class to meet the requirements of the National Building Code of Canada. Ideally, this would be done using the prediction method and the vibration reduction index values found in the standard, ISO 15712. However, prior studies conducted at the National Research Council Canada have shown that the hollow core slabs are neither homogeneous nor isotropic which are the requirements for predicting the values of the vibration reduction index (Kij) according to Annex E of the standard ISO 15712. To determine if the theoretical values of the vibration reduction index could nonetheless be applied in practice, an experimental investigation was performed on full scale junctions between concrete block masonry walls and precast concrete hollow core floors built and tested in full compliance with the standard ISO 10848. The investigation found that conservative vibration reduction index values could be predicted using Annex E of ISO 15712.
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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 | 0.001 |
| 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 | 0.000 | 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".