Experimental investigation and analytical solution for the coupled seismic response of 3D base-isolated structures
Bibliographic record
Abstract
This study systematically investigates the coupled horizontal-rocking seismic behavior of three-dimensional base-isolated structures (3D-BISs). First, a simplified analytical model accounting for superstructure flexibility is developed for the 3D-BIS. This model is used to conduct modal analysis, which reveals the influence of various design parameters on the coupling mechanism between horizontal and rocking motions. Subsequently, a novel multi-dimensional earthquake isolation and mitigation device (denoted MEIMD) is proposed to enhance seismic isolation efficiency and mitigate rocking effect of the 3D-BIS. Numerical simulations are conducted to explore the nonlinear rocking stiffness of the MEIMD. To evaluate the dynamic response characteristics of the 3D-BIS under rocking effect, full-scale horizontal shaking table tests are performed on a steel frame model (aspect ratio >3). The results indicate that the coupled motion mode leads to a gradual increase of horizontal peak floor acceleration from the second floor toward both the top and bottom of the 3D-BIS. The rocking effect induces a rigid-body rotation of the superstructure, which amplifies the horizontal displacement of the 3D-BIS while not increasing structural internal forces. Neglecting the superstructure flexibility may underestimate the rocking effect and the response contribution from high-order vibration modes, particularly for 3D-BISs with large aspect ratios. Finally, comprehensive comparisons between the analytical solutions and test results validate that the proposed model can reliably predict the coupled seismic response of the 3D-BIS.
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How this classification was reachedexpand
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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".