qa_report.md

# Dataset QA Report

- samples: 20000
- utilization_ok (UT≤1.0): 0.998
- utilization bands: {'in_0.9_1.0': 11469, 'le_0.9': 8486, 'in_1.0_1.1': 41, 'gt_1.1': 4}
- design status counts: {'optimal': 11469, 'feasible_underutilized': 8486, 'non_converged_oscillation': 37, 'infeasible_catalog_limit': 8}
- near-limit share (0.9–1.0 and 1.0–1.1): 0.576
- NaN cells: 0 (threshold 0) PASS
- boundary section share: 0.011 (threshold ≤ 0.05) PASS
- duplicate input vectors: 0
- overall: PASS

## Utilization-ok rate by span bin

- (11.999, 20.0]: 0.997
- (20.0, 30.0]: 0.998
- (30.0, 40.0]: 0.000

## Governing clause frequency

- EN1993_column: 9707
- SLS_deflection_vertical_L/200: 9319
- EN1993_beam: 945
- SLS_deflection_horizontal_H/150: 29

## Section usage (top 20)

- IPE300: 3578
- IPE330: 3491
- HEA240: 3422
- HEA220: 3127
- IPE360: 2920
- IPE270: 2865
- HEA260: 2616
- HEA280: 2154
- IPE400: 2067
- HEA200: 1982
- HEA300: 1810
- IPE240: 1733
- HEA180: 1169
- IPE450: 1004
- HEA320: 983
- IPE220: 850
- HEA160: 767
- HEA340: 511
- IPE200: 407
- IPE600: 390

## Eyeball sample IDs

- pf-003646
- pf-000815
- pf-009009

## Plots

- `qa_plots/hist_max_utilization.png`
- `qa_plots/bar_utilization_bands.png`
- `qa_plots/bar_design_status.png`
- `qa_plots/scatter_span_mass.png`
- `qa_plots/scatter_mass_eco2.png`