Theoretical basis and numerical simulation of impedance log test for evaluating the integrity of columns and piles
Bibliographic record
Abstract
In this paper, the theoretical capabilities of the impedance log method in profiling the geometry of a column or pile along its length are investigated. The main idea of this method is to introduce a transient stress wave into the member and then utilize the reflected signals to obtain the impedance profile. The impedance profile is then used to recover the equivalent cross-sectional area along the length of the pile. To gain an insight into this nondestructive evaluation technique, this research started with a review of its theoretical background. The dynamic behavior of defective columns or piles with weak zones, bulges, and necks of constant or varying cross sections were then simulated with finite element models. The success in recovering the profiles of this kind of rod-like structural members proved that the impedance log method is a tool with high potential for evaluating the integrity of piles.Key words: impedance log method, nondestructive test, stress wave, column, pile.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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 source (direct Gemma or distilled Codex), 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".