Stability of Steel Columns in Steel Concentrically Braced Frames Subjected to Seismic Loading
Bibliographic record
Abstract
Lateral loads primarily induce axial loads in members of steel concentrically braced frames but columns may also be subjected to drift induced bending moments that may affect their strength and stability. The article discusses three examples of CBF columns that are subjected to combined axial compression and bending moments in structures under severe seismic ground motions: columns at an intermediate level where soft-story response develops in an existing seismically deficient X-bracing, fixed base columns at the first level of a well-proportioned multi-story X-bracing system, and columns in multi-tiered braced steel frames. Nonlinear dynamic analysis of the columns is performed to examine their stability response under axial and bending demands. In the first two cases, the results indicate that bending moments have limited effects on the global stability of the columns. Conversely, columns in multi-tiered frames must be designed to resist the expected combined axial and flexural demands in order to prevent column instability.
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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 | 0.001 |
| 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".