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README.md

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----
-license: cc-by-nc-4.0
----
+---
+license: cc-by-nc-4.0
+task_categories:
+  - tabular-classification
+  - tabular-regression
+language:
+  - en
+tags:
+  - structural-engineering
+  - steel-frames
+  - finite-element-analysis
+  - eurocode-3
+  - karamba3d
+  - grasshopper
+  - architecture
+  - aec
+  - beam-design
+  - utilization
+pretty_name: EC3 Steel Portal Frame Structural Analysis Dataset
+size_categories:
+  - 1K<n<10K
+---
+
+# EC3 Steel Portal Frame Structural Analysis Dataset
+
+## Dataset Summary
+
+A parametric structural analysis dataset of **995 single-span steel portal
+frames** designed and verified to **Eurocode 3 (EN 1993-1-1:2005)**. Each
+record represents a unique frame configuration solved with the
+**Karamba3D 3.1 FEM solver** inside Grasshopper / Rhinoceros 3D.
+
+The dataset is intended for training and benchmarking AI models that predict
+structural performance, section selection, and code compliance in the early
+design phase of steel-framed buildings — industrial sheds, agricultural
+buildings, warehouses, and sports halls.
+
+---
+
+## Dataset Structure
+
+Two linked JSONL files:
+
+| File | Records | Description |
+|---|---|---|
+| `frames.jsonl` | 995 | One record per frame — geometry, loads, global results |
+| `elements.jsonl` | 3 450 | One record per structural element — section properties, utilization, internal forces |
+
+Frames and elements are linked via `run_id` (format: `SF-00001` → `SF-01000`).
+
+---
+
+## Frame Schema
+
+Each frame is a **2D single-span portal** in one of two configurations:
+
+| Type | Count | Elements |
+|---|---|---|
+| Monopitch | 530 | 2 columns + 1–2 rafters |
+| Gable | 465 | 2 columns + 2 rafters |
+
+Element identifiers: `C1`, `C2` = columns; `B1`, `B2` = roof beams (rafters)
+
+---
+
+## Parametric Ranges
+
+| Parameter | Range | Distribution |
+|---|---|---|
+| Span | 5.0 – 25.0 m | Uniform random |
+| Eaves height | 3.0 – 10.0 m | Uniform random |
+| Roof pitch | 3.0 – 25.0° | Derived from geometry |
+| Steel grade | S235 / S275 / S355 / S420 / S460 | ~200 frames each |
+| Wind load | 0.30 – 2.00 kN/m² | Uniform random |
+| Snow load | 0.30 – 4.00 kN/m² | Uniform random |
+| Column profile family | HEB | Fixed |
+| Rafter profile family | IPE | Fixed |
+
+---
+
+## Key Statistics
+
+| Metric | Value |
+|---|---|
+| Total frames | 995 |
+| Total elements | 3 450 |
+| EC3 compliant frames | 630 / 995 (63.3%) |
+| Mean frame weight | 4 036 kg |
+| Frame weight range | 323 – 11 799 kg |
+| Mean element utilization | 0.646 |
+| Utilization range | 0.003 – 1.755 |
+| Governing load case | ULS_SnowLead (86.7%), ULS_WindLead (13.2%) |
+| Governing EC3 check | My bending (93.3%), N axial (6.7%) |
+| Mean monopitch rafter midspan deflection | 112 mm |
+| Mean gable rafter midspan deflection | 47 mm |
+
+---
+
+## Fields
+
+### `frames.jsonl` — 30 fields per record
+
+| Field | Type | Unit | Description |
+|---|---|---|---|
+| `run_id` | string | — | Unique frame identifier (SF-XXXXX) |
+| `design_code` | string | — | EC3_EN1993-1-1_2005 |
+| `solver` | string | — | Karamba3D_3.1 |
+| `roof_type` | string | — | `gable` or `monopitch` |
+| `frame_schema` | string | — | Frame topology identifier |
+| `span_mm` | float | mm | Clear span between column bases |
+| `eaves_h_mm` | float | mm | Eaves height |
+| `ridge_h_mm` | float | mm | Ridge height |
+| `haunch_h_mm` | float | mm | Vertical rise from eaves to ridge |
+| `slope_deg` | float | degrees | Roof pitch angle |
+| `slope_pct` | float | % | Roof pitch as percentage |
+| `rafter_length_mm` | float | mm | True rafter length along slope |
+| `steel_grade` | string | — | S235 / S275 / S355 / S420 / S460 |
+| `col_profile_family` | string | — | Column section family (HEB) |
+| `beam_profile_family` | string | — | Rafter section family (IPE) |
+| `wind_kNm2` | float | kN/m² | Characteristic wind pressure |
+| `snow_kNm2` | float | kN/m² | Characteristic snow load |
+| `roof_sw_kgm2` | float | kg/m² | Roof self-weight (cladding + purlins) |
+| `tech_load_kgm2` | float | kg/m² | Imposed technical load on roof |
+| `max_col_defl_L` | int | — | Column sway limit denominator (H/L) |
+| `max_beam_defl_L` | int | — | Rafter deflection limit denominator (L/x) |
+| `frame_weight_kg` | float | kg | Total steel weight of frame |
+| `max_horiz_defl_mm` | float | mm | Maximum horizontal nodal displacement (all LCs) |
+| `max_vert_defl_mm` | float | mm | Maximum vertical nodal displacement (all LCs) |
+| `roof_mid_vert_defl_mm` | float | mm | Maximum vertical displacement at rafter midspan (all LCs) |
+| `n_elements` | int | — | Number of structural elements |
+| `load_cases` | list[str] | — | Names of all ULS load case combinations |
+| `is_ec3_compliant` | bool | — | True if all elements util ≤ 1.0 |
+| `nodes` | list[dict] | — | Node coordinates and support flags |
+| `displacements` | list[dict] | — | Nodal displacements per node per LC (mm) |
+
+### `elements.jsonl` — 47 fields per record
+
+| Field | Type | Unit | Description |
+|---|---|---|---|
+| `run_id` | string | — | Links to parent frame |
+| `elem_id` | string | — | Element identifier (C1, C2, B1, B2) |
+| `elem_type` | string | — | `column` or `rafter` |
+| `node_start` / `node_end` | int | — | Node indices |
+| `length_mm` | float | mm | Element length |
+| `section` | string | — | Profile name (e.g. HEB300, IPE400) |
+| `section_family` | string | — | Profile family (HEB, IPE) |
+| `A_cm2` | float | cm² | Gross cross-sectional area |
+| `Iyy_cm4` | float | cm⁴ | Second moment of area (strong axis) |
+| `Izz_cm4` | float | cm⁴ | Second moment of area (weak axis) |
+| `Wply_cm3` | float | cm³ | Plastic section modulus (strong axis) |
+| `Wplz_cm3` | float | cm³ | Plastic section modulus (weak axis) |
+| `iy_cm` / `iz_cm` | float | cm | Radii of gyration |
+| `Ay_cm2` / `Az_cm2` | float | cm² | Shear areas |
+| `uf_width_mm` | float | mm | Flange width |
+| `uf_thick_mm` | float | mm | Flange thickness |
+| `web_thick_mm` | float | mm | Web thickness |
+| `lf_thick_mm` | float | mm | Lower flange thickness |
+| `material` | string | — | Steel grade name |
+| `fy_MPa` | float | MPa | Yield strength |
+| `E_GPa` | float | GPa | Young's modulus |
+| `alpha_y` / `alpha_z` | float | — | Buckling imperfection factors (EC3 Table 6.2) |
+| `alpha_lt` | float | — | LT buckling imperfection factor (EC3 §6.3.2) |
+| `Lcr_y_mm` | float | mm | Buckling length (strong axis) |
+| `Lcr_z_mm` | float | mm | Buckling length (weak axis) |
+| `Lcr_lt_mm` | float | mm | Lateral-torsional buckling length |
+| `lambda_y` / `lambda_z` | float | — | Slenderness ratios |
+| `lambda_bar_y` / `lambda_bar_z` | float | — | Non-dimensional slenderness (EC3 §6.3) |
+| `weight_kg` | float | kg | Element steel weight |
+| `N_max_kN` / `N_min_kN` | float | kN | Max/min axial force across all LCs |
+| `axial_by_lc` | list[dict] | — | Axial force per load case |
+| `util_max` | float | — | Peak EC3 utilization ratio (governing LC) |
+| `util_N` | float | — | Axial force utilization at governing LC |
+| `util_Vy` / `util_Vz` | float | — | Shear utilization at governing LC |
+| `util_My` / `util_Mz` | float | — | Bending utilization at governing LC |
+| `is_ec3_ok` | bool | — | True if util_max ≤ 1.0 |
+| `govern_check` | string | — | Governing EC3 check (N / My / Mz / Vy / Vz) |
+| `govern_lc` | string | — | Name of governing load case combination |
+
+---
+
+## Load Case Combinations (10 per frame)
+
+All combinations follow EN 1990 Annex A1 ULS persistent/transient design
+situation with ψ₀ combination factors per EN 1991:
+
+| Name | Leading action |
+|---|---|
+| `ULS_SnowLead` | Snow dominant (wind as accompanying) |
+| `ULS_WindLead` | Wind dominant (snow as accompanying) |
+| + 8 further combinations | Dead load, imposed, combinations thereof |
+
+---
+
+## Data Generation Pipeline
+
+```
+Grasshopper / Rhinoceros 3D
+  └── Parametric frame geometry (uniform random sampling)
+  └── Karamba3D 3.1 FEM solver
+        └── 10 ULS load case combinations (EN 1990 Annex A1)
+        └── EC3 EN 1993-1-1:2005 cross-section + stability checks
+        └── BeamView utilization component (max across all LCs)
+        └── BeamDisplacements component (midspan deflection)
+  └── GHPython 3 extractor (CPython 3.9, Rhino 8)
+        └── frames.jsonl
+        └── elements.jsonl
+```
+
+**Solver:** Karamba3D 3.1 (Clemens Preisinger, TU Vienna / Bollinger+Grohmann)  
+**Design code:** EC3 EN 1993-1-1:2005 with EN 1990 load combinations  
+**Platform:** Rhinoceros 8 / Grasshopper, Windows  
+
+---
+
+## Known Limitations
+
+- Column profiles limited to **HEB only** — HEA, UC, HD sections not included
+- Rafter profiles limited to **IPE only** — welded, cellular, and tapered sections not included
+- **Wind pressure only** — wind suction (uplift) load cases are not included; wind uplift on roof can govern rafter design in practice and is absent from this dataset
+- 2D single-span frames only — no multi-bay, crane gantry, mezzanine, or 3D effects
+- Connections not modelled — fully rigid frame assumption throughout
+- No second-order (P-Δ) effects — first-order linear elastic analysis only
+- SLS deflection limits are recorded but **not used** for section selection; some compliant frames may still exceed SLS limits in practice
+- `roof_mid_vert_defl_mm` is worst-case across all 10 ULS load combinations — not the SLS characteristic combination (approximately 30% conservative)
+- 5 missing run_ids in SF-00001–SF-01000 sequence due to solver failures during batch generation
+
+---
+
+## Intended Use Cases
+
+- Training ML regression models to predict `util_max`, `frame_weight_kg`,
+  `roof_mid_vert_defl_mm` from geometric and load input parameters
+- Training classification models to predict `is_ec3_compliant`
+- Surrogate modelling for structural optimisation loops
+- Benchmarking graph neural networks on 2D frame topology
+- Research in AI-assisted structural design and automated EC3 checking
+- Education — demonstrating EC3 design parameter sensitivity
+
+---
+
+## License
+
+**CC BY-NC 4.0** — free for research and non-commercial use with attribution.  
+For commercial licensing enquiries contact the author.
+
+---
+
+## Citation
+
+```bibtex
+@dataset{neiburgs_ec3_steel_frames_2025,
+  title     = {EC3 Steel Portal Frame Structural Analysis Dataset},
+  author    = {Neiburgs, Arturs},
+  year      = {2025},
+  publisher = {KOPAA},
+  url       = {https://huggingface.co/datasets/kopaaParametric/ec3-steel-portal-frames},
+  license   = {CC BY-NC 4.0},
+  note      = {Generated with Karamba3D 3.1 / Grasshopper / Rhinoceros 8.
+               995 frames, 3450 elements, EC3 EN 1993-1-1:2005.}
+}
+```
+
+---
+
+## Contact
+
+**Arturs Neiburgs**  
+KOPAA  
+✉ arturs.neiburgs@kopaa.io  
+🔗 [LinkedIn](https://www.linkedin.com/in/arturs-neiburgs-75351996/)