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 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 | 0.001 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".