Nonlinear tensile behavior of ±55˚ concrete-filled GFRP tubes: Experimental and theoretical studies
Why this work is in the frame
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Bibliographic record
Abstract
Concrete-filled fiber-reinforced polymer (FRP) tubes (CFFTs) with angle-ply configurations, such as ±55˚ glass-FRP (GFRP) tubes, show highly nonlinear behavior that is not captured by conventional cross-ply tubes. A key challenge has been capturing their failure strains under tension, since large deformations have prevented accurate measurements with conventional instrumentation. This study addresses this challenge by introducing a novel test configuration capable of capturing the tensile response of ±55˚ GFRP tube filled with concrete (±55˚ CFFTs) under pure axial tension. A well-instrumented ±55˚ CFFT beam test was conducted, which recorded ultimate tensile strain of 0.077 mm/mm for the first time. To complement the experiments, nonlinear finite element (FE) models were developed to simulate ±55˚ CFFTs tensile behavior. The models successfully reproduced the nonlinear response with only 3%-4% variance from experimental results. Building on these findings, a design-oriented constitutive tension equation was formulated specifically for ±55˚ GFRP tubes, and an analytical model incorporating this equation was then established to predict the moment capacity of ±55˚ CFFT beams, and validation against multiple experimental beam tests demonstrated strong predictive accuracy (85%-100% agreement in ultimate load and deflection), representing a substantial improvement over existing models.
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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) | 0.001 | 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 it