Stability of Steel Columns in Steel Concentrically Braced Frames Subjected to Seismic Loading
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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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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) | 0.001 | 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) | 0.000 | 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 it