smillmorel
612936a00b
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69 lines
2.7 KiB
Python
69 lines
2.7 KiB
Python
"""Integration test for RC Frame Pushover example (OpenSees Ex 3.2)."""
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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 import load_project, save_project # noqa: E402
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from otko.services.opensees_runner import OpenSeesRunner # noqa: E402
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def test_rc_frame_pushover_reaches_target_with_fallback(tmp_path) -> None: # type: ignore[no-untyped-def]
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"""The 15-in pushover requires the ModifiedNewton convergence
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fallback to finish; without it the Newton solver stalls in the
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softening regime. This test asserts the full curve is produced
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AND shows expected nonlinear shape.
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"""
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from examples.rc_frame_pushover import (
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build_rc_frame_pushover,
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D_STEP,
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D_TARGET,
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)
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from otko.core import PushoverCase
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proj = build_rc_frame_pushover()
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proj.validate_references()
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path = tmp_path / "rc_push.osmodel"
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save_project(proj, path)
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reloaded = load_project(path)
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reloaded.validate_references()
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# Pushover is one of several cases now (preload + pushover) — pick
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# by type instead of index.
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push_case = next(c for c in reloaded.analyses if isinstance(c, PushoverCase))
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result = OpenSeesRunner(reloaded).run(push_case)
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expected_pts = int(D_TARGET / D_STEP) + 1 # 151 including step 0
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assert len(result.control_disp) == expected_pts, (
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f"Got {len(result.control_disp)} points, expected {expected_pts} — "
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"ModifiedNewton fallback probably didn't kick in."
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)
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# Reached the target displacement.
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assert result.control_disp[-1] == pytest.approx(D_TARGET, rel=1e-3)
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# Curve shape: monotonic climb followed by near-plateau (yielding).
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# The elastic slope should exceed the post-yield slope by > 4x.
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early_slope = (result.base_shear[10] - result.base_shear[0]) / (
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result.control_disp[10] - result.control_disp[0]
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)
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late_slope = (result.base_shear[-1] - result.base_shear[-20]) / (
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result.control_disp[-1] - result.control_disp[-20]
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)
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assert early_slope > 4 * late_slope, (
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f"Early slope {early_slope:.2f} not >> late slope {late_slope:.2f} — "
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"no yielding visible in the curve."
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)
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# Peak base shear in a reasonable band for this frame — 150-250 kip.
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peak = max(abs(result.base_shear))
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assert 100.0 < peak < 300.0, f"Peak base shear {peak:.1f} kip out of band"
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# Gravity preload stayed applied — column axial force at the start
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# of the pushover (step 1) should be close to P = 180 kip.
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step1_col1 = result.element_forces[1][1]
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axial_step1 = abs(step1_col1[0])
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assert 100.0 < axial_step1 < 260.0, (
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f"Col 1 axial at step 1 = {axial_step1:.1f} kip — gravity preload lost?"
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)
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