Efficacy of Double‐Tuned Mass Dampers in Reducing Higher Mode Effects in Controlled Rocking Steel Braced Frames
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Bibliographic record
Abstract
ABSTRACT This study proposes the application of double‐tuned mass dampers (TMDs) to mitigate higher mode effects in controlled rocking steel braced frames (CRBFs). A double TMD system employs two separate TMDs that can be tuned to different frequencies. Archetype 12‐, 16‐, and 20‐story CRBFs are designed using the modified modal superposition (MMS) method. A sensitivity analysis of the seismic response of CRBFs equipped with a TMD is presented under far‐field (FF) and non‐pulse‐like near‐field (NF) ground motion records. Moreover, the optimal design of CRBFs with double TMDs is explored in two optimization studies using a particle swarm optimization algorithm. The study also conceptually proposes an isolated floor damping system that can address challenges associated with structural design and the space requirements of TMDs. The results show that under FF earthquakes, an optimally designed CRBF with double TMDs can reduce median story shears and moments by up to 33.7% and 24.0%, respectively. Under NF earthquakes, the reductions are up to 24.2% and 29.1%, respectively. Double TMDs reduce 84 th percentile‐to‐MMS demand ratio by nearly 35% while decreasing the weight of archetype frames by an average of 14%. The results demonstrate the effectiveness of using double TMDs in controlling higher mode effects in CRBFs. Furthermore, the study shows that incorporating optimal double TMDs effectively reduces the structural demand under severe earthquakes, thereby decreasing the weight of the rocking frames. Author's Novelty Proposed and investigated the application of double tuned mass dampers (TMDs) to mitigate higher mode effects in controlled rocking steel braced frames (CRBFs). Through sensitivity analyses and optimization studies on CRBFs with TMDs, we assessed the effectiveness of double TMDs in minimizing higher mode effects in CRBFs. Proposed a new isolated floor damping system. Proposed the incorporation of end columns in CRBFs to effectively isolate the floor diaphragm from the rocking frame. Presented a post‐optimization design procedure for CRBFs with double TMDs under severe earthquakes.
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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 | 0.001 | 0.001 |
| 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