Seismic Performance Evaluation and Design of Multi-Tiered Steel Concentrically Braced Frames
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Bibliographic record
Abstract
Tall single-storey steel buildings are commonly used in North America for various applications such as industrial buildings, airplane hangars, recreation centers or warehouse buildings. Typical lateral load resisting system in these buildings is concentrically steel braced frames with two or more bracing tiers stacked between the ground and the roof levels. Multi-tiered steel braced frames represent an economical option for such tall single-storey buildings as smaller braces with reduced expected strengths can be used in each tier compared to larger sections when braces span over the full height of the frame. Furthermore, using single bracing members is often not practical in tall structures.. Nonlinear static and seismic time history analyses of multi-tiered steel braced frames have revealed that a non-uniform distribution of the inelastic response over the frame height, which induces large in-plane bending moments on the columns and excessive ductility demand on the bracing members. This paper presents the results of a parametric study in which the nonlinear seismic response of multi-tiered steel braced frames designed according to current Canadian code provisions for steel structures (CSA S16-09) is examined. Different frame typologies and building heights are considered. Special attention is paid to the seismic demand on the columns when the bracing members yield and buckle under seismic ground motions. The effects of the brace boundary conditions and column base fixity on the stability response of the columns are also examined. The results show that non-uniform vertical distribution of brace buckling and yielding cause to form plastic hinge in the columns, and subsequently affect the stability of the columns. Different design strategies are investigated to achieve satisfactory seismic performance of multi-tiered braced steel frames. Increasing the column in-plane flexural strength and stiffness is found to improve the response and obtain uniform less critical ductility demand on the braces. A comprehensive design method that explicitly accounts for column in-plane and out-of-plane bending moment demand and ensure proper distribution of the inelastic demand is proposed and its validity is verified through nonlinear dynamic analysis.
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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) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 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 it