Canadian Standards Association standard A23.3-04 resistance factor for concrete in compression
Bibliographic record
Abstract
This paper presents the rationale for increasing the resistance factor for concrete in compression in the 2004 edition of the Canadian Standards Association (CSA) standard A23.3, Design of concrete structures, from 0.60 to 0.65 and for precast concrete produced in CSA-certified plants from 0.65 to 0.70. The new values are supported by a probability-based resistance factor calibration and an investigation of their impact in the context of current American standards and past editions of A23.3. The work was initiated because parameters for the rectangular concrete stress block introduced in the 1994 edition of A23.3 give smaller factored resistances for concretes with strengths between 20 and 40 MPa. Minimum target reliability indices for components that fail suddenly are maintained using the new resistance factors. In the regions of compressive force – bending moment interaction diagrams that are controlled by the resistance factor for concrete, the factored resistances computed using the 2004 edition of A23.3 are similar to those of current American design criteria.Key words: code calibration, compression-initiated failure, concrete, interaction diagram, rectangular stress block, ultimate limit state.
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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 | 0.001 | 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 | 0.000 |
| 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".