Cyclic Testing of Lap-Spliced Columns Retrofitted with UHPC-Cover Replacement
Why this work is in the frame
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Bibliographic record
Abstract
It is the purpose of this study to evaluate, through combined experimental and numerical research, the performance of ultra-high-performance concrete (UHPC) jackets as a means of seismic retrofitting of columns with brittle detailing under cyclic loading. A series of conventionally designed RC column elements were constructed based on detailing methodologies of pre-1980s standards. After imparting preliminary damage to the columns, simulating the aftereffects of seismic excitation, the plastic hinge zone was repaired using cover replacement by a commercial-grade tension-hardening UHPC jacket and tested under cyclic displacement reversals to obtain quantified evidence regarding the performance of this retrofit methodology. Significant improvements in strength and ductility were observed in both the UHPC-repaired and -strengthened specimens, while failure modes associated with the limitations of lap-spliced connections at the column–footing interface were eliminated. Parallel finite-element analysis (FEA) simulations were used to evaluate the broader distributions of the longitudinal strains in the flexural reinforcement, illustrating the contribution of the UHPC jackets in prolonging the seismic response of retrofitted members.
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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) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| 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