54 lines
1.9 KiB
Python
54 lines
1.9 KiB
Python
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"""OpenSees integration test for the Basic Truss example.
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Verifies the Example 1 (3-bar truss) model builds, runs, and produces
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a physically reasonable tip deflection. This is the first of the
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OpenSees Examples Manual regression tests.
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"""
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from __future__ import annotations
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import pytest
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pytest.importorskip("openseespy")
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from otko.services.opensees_runner import OpenSeesRunner # noqa: E402
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pytestmark = pytest.mark.slow
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def test_basic_truss_matches_opensees_tcl_reference() -> None:
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"""Crown displacement must match the OpenSees Tcl Example-1 reference.
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The Tcl model (kip-in) reports node 4 disp = (+0.5301, -0.1779) in.
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Our SI model converts to that: 0.5301" = 0.01346 m,
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0.1779" = 0.004518 m. Tolerance is tight because the SI model is
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a linear rescale of the Tcl model — any deviation would flag a
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real solver/translation issue.
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"""
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from examples.basic_truss import build_basic_truss, IN_TO_M
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proj = build_basic_truss()
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runner = OpenSeesRunner(proj)
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result = runner.run(proj.analyses[0])
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assert 4 in result.node_disp
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ux, uy = result.node_disp[4][-1]
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ux_in = ux / IN_TO_M
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uy_in = uy / IN_TO_M
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assert ux_in == pytest.approx(+0.5301, abs=1e-3), f"Ux = {ux_in} in"
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assert uy_in == pytest.approx(-0.1779, abs=1e-3), f"Uy = {uy_in} in"
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# All three truss bars must have recorded forces.
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assert set(result.element_forces.keys()) == {1, 2, 3}
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def test_basic_truss_round_trips(tmp_path) -> None: # type: ignore[no-untyped-def]
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"""The example project must survive save/load without any information loss."""
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from examples.basic_truss import build_basic_truss
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from otko.services import load_project, save_project
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p = build_basic_truss()
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path = tmp_path / "basic_truss.osmodel"
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save_project(p, path)
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r = load_project(path)
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assert r.model_dump(by_alias=True) == p.model_dump(by_alias=True)
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