Slotted-Hidden-Gap (SHG) connection for square hollow section bracing members under cyclic loading
Bibliographic record
Abstract
The Slotted-Hidden-Gap (SHG) connection is an improved version of the conventional welded tube-to-gusset connection between square hollow section (SHS) braces and framing elements used in Concentrically Braced Frames (CBFs). It offers an enhanced performance without the need for additional steel plate reinforcement near the bracing end connection. Studies have demonstrated the efficiency of the SHG connection in circular and square braces under monotonic tensile loading conditions, leading to the development of a design methodology based on the CSA S16 Steel Design Standard. However, limited research has been dedicated to investigating the compressive behaviour of this brace-connection configuration. A numerical parametric study was hence conducted to examine the inelastic response of the connection under reversed cyclic loading. Various parameters were considered, including the SHS size, the weld length and size, the brace slenderness, and the degree of confinement of the gusset plate. Designed based on the previously developed methodology, the simulated braces demonstrated their ability to withstand compressive loading cycles without fracturing at the connection, making it capacity design protected. The findings indicate that all confinement degrees of the gusset plate in the numerically tested models, from a constrained gusset plate to a linear clearance, led to the typical fracture initiation due to ultra-low-cycle fatigue away from the connection at the mid-length of the brace.
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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 | 0.000 | 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 | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".