feat: named case-result load combinations with full GUI support
Snapshots the current development tree, headlined by proper load combinations (user request): a reusable LoadCombination entity of weighted completed static-case results (e.g. 1.2xDead + 1.6xLive). - core: LoadCombination/LoadCombinationItem entities, Project integration (lookup, unique ids, reference validation) - services: combinations.py (linear superposition + envelope), exported via services __init__ - commands: undoable Add/Delete/Update for combinations - GUI: Load Combinations manager dialog, Run-dialog evaluation, envelope display in Results panel, Combinations tab in Table dock - tests: unit coverage (validation, math, error paths) + integration superposition check vs a single factored run
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examples/portal_frame.py
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examples/portal_frame.py
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"""Build a 3D portal frame with Static + Modal + Transient cases.
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Run from the repository root:
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python examples/portal_frame.py
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Produces ``examples/portal_frame.osmodel`` — open it from the GUI's
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File → Open menu, then exercise:
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- **Static** case → Display → Show Deformed Shape, Show Force Diagram
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- **Modal** case → Display → Animate Mode Shape
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- **Transient** case → Display → Time-History Plot, Hysteresis Plot
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The model is a single-bay portal frame loaded laterally:
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Top-L ──── Beam ──── Top-R z
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│ │ │
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│ │ │
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Col-L Col-R └── x
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│ │
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Base-L Base-R (y = 0; planar in x-z)
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Mass is lumped at the top nodes so modal/transient solvers have
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non-singular mass matrices.
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"""
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from __future__ import annotations
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import math
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from pathlib import Path
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from otko.core import (
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ElasticBeamColumn,
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ElasticSection,
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LinearTimeSeries,
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ModalCase,
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NodalLoad,
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Node,
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PathTimeSeries,
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PlainLoadPattern,
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Project,
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ProjectMeta,
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StaticCase,
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Steel01,
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TransientCase,
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UnitSystem,
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)
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from otko.services import load_project, save_project
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def _sine_pulse_factors() -> list[float]:
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"""One half-cycle sine over the first 0.5s, then zero for the rest of 2s."""
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n_pulse = 50 # 0.5 s @ 100 Hz
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n_total = 200
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return [math.sin(math.pi * i / n_pulse) if i < n_pulse else 0.0
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for i in range(n_total)]
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def build_portal_frame() -> Project:
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"""A two-column, one-beam steel portal frame with static + dynamic cases."""
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return Project(
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meta=ProjectMeta(name="Portal Frame", author="Ozan", units=UnitSystem.SI_M_N),
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ndm=3,
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ndf=6,
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nodes=[
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Node(id=1, name="Base-L", coords=(0.0, 0.0, 0.0), restraint=(True,) * 6),
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Node(id=2, name="Base-R", coords=(6.0, 0.0, 0.0), restraint=(True,) * 6),
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Node(id=3, name="Top-L", coords=(0.0, 0.0, 3.0),
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mass=(5000.0, 5000.0, 5000.0, 0.0, 0.0, 0.0)),
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Node(id=4, name="Top-R", coords=(6.0, 0.0, 3.0),
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mass=(5000.0, 5000.0, 5000.0, 0.0, 0.0, 0.0)),
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],
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materials=[
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Steel01(id=1, name="S420", Fy=420e6, E0=200e9, b=0.01),
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],
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sections=[
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ElasticSection(
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id=1, name="W14x90",
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E=200e9, A=0.017,
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Iz=4.16e-4, Iy=1.29e-4,
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G=80e9, J=2.04e-6,
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),
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],
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elements=[
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ElasticBeamColumn(id=1, name="Col-L", nodes=(1, 3), section_id=1),
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ElasticBeamColumn(id=2, name="Col-R", nodes=(2, 4), section_id=1),
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ElasticBeamColumn(id=3, name="Beam", nodes=(3, 4), section_id=1),
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],
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time_series=[
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LinearTimeSeries(id=1, name="Ramp"),
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PathTimeSeries(
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id=2, name="SineGust",
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values=_sine_pulse_factors(),
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dt=0.01,
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),
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],
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load_patterns=[
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# Pattern 1: 50 kN lateral push at top-left for Static.
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PlainLoadPattern(
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id=1, name="Lateral",
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time_series_id=1,
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nodal_loads=[NodalLoad(node_id=3, forces=(50_000.0, 0, 0, 0, 0, 0))],
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),
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# Pattern 2: 100 kN sine pulse at top-left for Transient.
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PlainLoadPattern(
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id=2, name="SineGustPattern",
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time_series_id=2,
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nodal_loads=[NodalLoad(node_id=3, forces=(100_000.0, 0, 0, 0, 0, 0))],
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),
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],
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analyses=[
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StaticCase(id=1, name="Linear-Static", pattern_ids=[1]),
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ModalCase(id=2, name="Modal-3", n_modes=3),
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TransientCase(
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id=3, name="Sine-Gust-2s",
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pattern_ids=[2],
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dt=0.01, n_steps=200, # 2 seconds @ 100 Hz
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),
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],
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)
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def main() -> None:
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project = build_portal_frame()
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project.validate_references()
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print(f"Built '{project.meta.name}' — {len(project.nodes)} nodes, "
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f"{len(project.elements)} elements, {len(project.analyses)} cases.")
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out_path = Path(__file__).with_suffix(".osmodel")
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save_project(project, out_path)
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print(f"Saved -> {out_path}")
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restored = load_project(out_path)
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restored.validate_references()
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assert restored.model_dump(by_alias=True) == project.model_dump(by_alias=True)
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print("Round-trip OK.")
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if __name__ == "__main__":
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main()
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