90 lines
2.8 KiB
Python
90 lines
2.8 KiB
Python
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"""Load-combination integration: 1.2×D + 1.6×L by superposition == one combined run."""
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from __future__ import annotations
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import math
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import pytest
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ops = pytest.importorskip("openseespy.opensees") # skip if OpenSeesPy not installed
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from otko.core import ( # noqa: E402
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ElasticBeamColumn,
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ElasticSection,
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LinearTimeSeries,
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LoadCombination,
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LoadCombinationItem,
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NodalLoad,
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Node,
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PlainLoadPattern,
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Project,
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StaticCase,
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)
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from otko.services import OpenSeesRunner, evaluate_combination # noqa: E402
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from otko.services.results import StaticResults # noqa: E402
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pytestmark = pytest.mark.slow
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def _two_pattern_cantilever() -> Project:
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elastic_mod = 200e9
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area = 0.01
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inertia = 8.333e-6
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return Project(
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ndm=2,
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ndf=3,
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nodes=[
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Node(
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id=1,
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coords=(0.0, 0.0, 0.0),
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restraint=(True, True, False, False, False, True),
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),
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Node(id=2, coords=(5.0, 0.0, 0.0)),
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],
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sections=[ElasticSection(id=1, E=elastic_mod, A=area, Iz=inertia)],
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elements=[ElasticBeamColumn(id=1, nodes=(1, 2), section_id=1)],
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time_series=[LinearTimeSeries(id=1), LinearTimeSeries(id=2)],
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load_patterns=[
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PlainLoadPattern(
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id=1,
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name="Dead",
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time_series_id=1,
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nodal_loads=[NodalLoad(node_id=2, forces=(0.0, -1000.0, 0.0, 0.0, 0.0, 0.0))],
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),
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PlainLoadPattern(
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id=2,
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name="Live",
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time_series_id=2,
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nodal_loads=[NodalLoad(node_id=2, forces=(0.0, -500.0, 0.0, 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="Dead", pattern_ids=[1]),
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StaticCase(id=2, name="Live", pattern_ids=[2]),
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],
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)
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def test_superposition_matches_combined_run() -> None:
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"""1.2*Dead + 1.6*Live via evaluate_combination == single StaticCase run."""
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proj = _two_pattern_cantilever()
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dead = OpenSeesRunner(proj).run(proj.analyses[0])
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live = OpenSeesRunner(proj).run(proj.analyses[1])
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combo = LoadCombination(
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id=1,
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name="1.2D+1.6L",
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kind="Linear",
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items=[
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LoadCombinationItem(case_id=1, factor=1.2),
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LoadCombinationItem(case_id=2, factor=1.6),
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],
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)
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combined = evaluate_combination({1: dead, 2: live}, combo)
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assert isinstance(combined, StaticResults)
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# Single run with both patterns factored identically.
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direct = OpenSeesRunner(proj).run(
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StaticCase(id=3, name="direct", pattern_ids=[1, 2], pattern_factors={1: 1.2, 2: 1.6})
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)
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assert math.isclose(
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combined.disp(node_id=2, dof=2), direct.disp(node_id=2, dof=2), rel_tol=1e-9
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)
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