Load Distribution in Short and Medium Span, Shear-connected, Precast Beam Bridges Under CHBDC Truck Loading
Bibliographic record
Abstract
The 2019 Canadian Highway and Bridge Design Code recognized shear-connected Tee, DoubleTee and inverted-U precast beams to accelerate bridge construction. However, a simplified live load method of analysis of this type is yet unavailable. Therefore, a parametric study was conducted using the Orthotropic Plate Theory to determine the transverse vertical shear required to design the shear key between adjacent beams as affected by bridge span and width, flexuraltorsional parameter, and loading conditions. This study resulted in six charts for this shear force for one-lane to six-lane bridge configurations. Another parametric study was conducted to determine the truck load fraction carried by each beam, leading to empirical equations for moment and shear distribution factors required for beam design. Another analysis was conducted to investigate the applicability of the AASHTO Lever Rule method on this bridge type. Based on the analysis findings, this method was modified to include the effect of beam spacing and span and flexural-to-torsional stiffness ratio.
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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 | 0.000 |
| 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 | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.004 | 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".