Assessment of Earthquake Action Resistance of Precast I-Girder Prestressed Concrete Intersection Bridge Based on Modal Seismic and Demand to Capacity Ratio Methods
Bibliographic record
Abstract
The methodology of this study consisted of selecting the bridge structure, creating a bridge model by using CSI-Bridge Ver. 25, applying ground movement within bridge location as earthquake load, using modal analysis method and demand/capacity ratio method to evaluate the seismic resistance of bridge structure.The results showed that the average value of seismic natural frequency is small and equal to 1.566 Hz which is small value, indicating insufficient stiffness and elasticity.For the transverse direction (Y) representing the cross-section of the bridge, the magnitudes of D/C ratio are similar for each bent with the maximum value equal to 0.4484 at bent No. 5, which is lower than 1.But in longitudinal direction of bridge line (X), the D/C ratio for all bents is near and equal to 2.396 as maximum value within bent No. 5 which much greater than 1, indicating that the demand is more than capacity of bridge bents and they can't resist the earthquake lateral load.This study suggested to increase the piers diameter to increase the size of bridge piers, leading to improve the structural performance, stiffness, elasticity, bearing capacity of bridge piers to resists the earthquake action and the increasing of piers diameter is 1.6 m, 1.8 m, and 2 m.The analysis showed than the increasing of piers diameter leads to an increase the seismic natural frequency and decreasing of D/C ratio for all bents with diameters 1.8 m and 2 m.
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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".