Experiments on T-stiffener and Doubler Plate Reinforced Moment Connections for Wide-Flange Beams and RHS Columns in Type LD MRFs: Recommendations for CSA S16
Bibliographic record
Abstract
Two beam-to-rectangular hollow section (RHS) column connections were investigated to assess the CSA S16:24 design requirements for limited-ductility (Type LD) moment resisting frames (MRFs). The first connection was reinforced externally using T-stiffeners, and the second had top and bottom flange plates welded to a doubler plate reinforced RHS wall. This paper presents a comparison of the CSA S16:24 design requirements for Type LD MRF connections to the AISC 341-22 design requirements for ordinary moment frames; a rational design approach for each of the two beam-to-column connections; and the results of an experimental program comprising two quasi-static and four reverse cyclic tests on full-scale assemblies. An evaluation of the connections’ strength, stiffness, and overall behaviour is made, and both connections are shown to meet the performance requirements of CSA S16:24 Clause 27.4.4.c. Recommendations are provided to facilitate the use of RHS columns in Type LD MRFs.
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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 | 0.002 | 0.003 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 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".