Evaluation of Linearity of First Mode of Vibration in Resonant Column Testing
Bibliographic record
Abstract
The shear strain along the height of a specimen in resonant column testing (ASTM D4015‐92) is assumed to vary linearly when evaluating its dynamic shear modulus and damping ratio. To examine this assumption, specimens of dry sand, mine tailings, and cemented sand are tested at different confinement and shear strain levels. The coupling between the cemented‐sand specimen and the top and bottom platens is enhanced using three different agents: gypsum cement, Portland cement, and epoxy resin. The mode shapes are measured using a miniature accelerometer that is attached to the specimen at predefined elevations and a reference accelerometer placed at the top of the specimen (driving plate). The dynamic properties of the specimens are computed from the responses of both accelerometers. The measured mode shapes for dry sands and mine tailings are linear but the cemented‐sand specimen displayed a nonlinear behavior in terms of the mode shape and change in dynamic properties with the strain level. The accuracy of the measured mode shape and dynamic properties is improved as the coupling between the specimen and the platens is enhanced. The epoxy resin produced best coupling, followed by Portland and gypsum cements, with the latter two only effective at low confinement and strain level.
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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".