Simplified design model for rigid pipe joints based on the two-pipe approximation
Bibliographic record
Abstract
Solutions for expected shear force and rotation across joints connecting rigid pipes are formulated for use in the structural design of rigid pipe joints and possible inclusion in current pipe standards. The loading system is divided into live loading and earth loading, and these cases are treated separately. Exact algebraic solutions are derived using the beam-on-elastic-spring approximation for two rigid pipes connected by a moment-release joint, which is considered conservative. Additional discussions are also presented about the conservative nature of the “two-beam”-on-elastic-spring approximation compared to finite element solutions for beam-on-elastic-springs problems involving more pipe segments. A parametric study is then presented examining the key controlling factors. Vehicle load calculations assume live load spreading with depth approximated by a trapezoidal loading prism. Earth load calculations are derived for a change in the stiffness of soil support from one section of the pipeline to the next. Comparisons with experimental measurements indicate that the design equations reflect observed changes in joint response as burial depth or pipe diameter increases. Experimental variability is considerable however, and the design calculations are generally conservative.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.010 | 0.003 |
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".