Parametric Study on the Effect of Intermittent Expansion Joints on the Design of A TL-5 Single-Slope Concrete Barrier-Deck Overhang System
Bibliographic record
Abstract
This parametric study investigates the effect of intermittent construction joints on the moments, shear, and tensile forces on the barrier wall and deck slab overhang in slab-on-girder bridges due to transverse vehicle impact loads.This study used the threedimensional finite-element modeling of TL-5 single-slope concrete barrier mounted over a 1.5 m length deck overhang.The length of the barrier, Lb, and intermittent open expansion joint spacing: the joint spacings considered in this research were 6, 5, 4, and 3 m.For the 6 m joint spacing, the total lengths of the barrier studied in this research were 24, 18, and 12 m.Also, for the 5 m joint spacing, 20, 15, and 10 m total barrier lengths were studied.Moreover, the total lengths of the barriers were 20, 16, 12, and 8 m for the 4 m joint spacing.For the 3 m joint spacing, the total barrier lengths were taken at 15, 12, 9, and 6 m.In all these barrier-deck overhang systems, the overhang length in the direction of traffic was taken equal to the total barrier length.For applied transverse impact load within the barrier length, the results show that intermittent joints can lead to higher transverse moments and shear forces at the barrier base, with increases of up to 44% and 9%, respectively, while reducing the maximum horizontal moment in the barrier wall.Additionally, intermittent joints caused an increase of up to 58% and 23% in moments and tensile forces in the deck overhang.In contrast, the intermittent expansion joint influence was minimal in the exterior load case at the barrier end.
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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".