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/ex3_canti2d_inelastic_fiber_section.py
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examples/ex3_canti2d_inelastic_fiber_section.py
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"""OpenSees Example 3. Cantilever Column with units: fiber-section build."""
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from __future__ import annotations
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from pathlib import Path
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import math
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import sys
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if __package__ is None or __package__ == "":
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sys.path.insert(0, str(Path(__file__).resolve().parents[1] / "src"))
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from otko.core import ( # noqa: E402
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Concrete02,
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FiberSection,
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ForceBeamColumn,
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LinearTimeSeries,
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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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PushoverCase,
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RectangularPatch,
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StaticCase,
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Steel02,
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StraightLayer,
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TransientCase,
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UniformExcitationPattern,
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UnitSystem,
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)
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from otko.services import load_project, save_project # noqa: E402
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from otko.services.peer_record import parse_plain_values # noqa: E402
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INCH = 1.0
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KIP = 1.0
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SEC = 1.0
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FT = 12.0 * INCH
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KSI = KIP / INCH**2
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PSI = KSI / 1000.0
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IN2 = INCH * INCH
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G_ACCEL = 32.2 * FT / SEC**2
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L_COL = 36.0 * FT
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WEIGHT = 2000.0 * KIP
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H_COL = 5.0 * FT
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B_COL = 5.0 * FT
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P_COL = WEIGHT
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MASS = P_COL / G_ACCEL
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A_COL = B_COL * H_COL
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IZ_COL = (1.0 / 12.0) * B_COL * H_COL**3
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COVER_COL = 5.0 * INCH
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NUM_BARS_COL = 20
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BAR_AREA_COL = 2.25 * IN2
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FC = -4.0 * KSI
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EC = 57.0 * KSI * math.sqrt(-FC / PSI)
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FC1U = FC
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EPS1U = -0.003
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FC2U = 0.2 * FC1U
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EPS2U = -0.01
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LAMBDA = 0.1
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FTU = -0.14 * FC1U
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ETS = FTU / 0.002
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FY = 66.8 * KSI
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ES = 29000.0 * KSI
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BS = 0.01
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R0 = 18.0
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CR1 = 0.925
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CR2 = 0.15
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NUM_INT_PTS = 5
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N_GRAVITY = 10
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GRAVITY_STEP = 1.0 / N_GRAVITY
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PUSH_TARGET = 0.05 * L_COL
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PUSH_STEP = 0.001 * L_COL
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H_LOAD = WEIGHT
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GROUND_DT = 0.01
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GROUND_FACTOR = 1.0
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ANALYSIS_DT = 0.01
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ANALYSIS_STEPS = 1000
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DAMPING_RATIO = 0.02
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_ROOT = Path(__file__).resolve().parent
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GROUND_MOTION_FILE = _ROOT / "data" / "BM68elc.acc"
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REFERENCE_BUILD_TCL = _ROOT / "data" / "Ex3.Canti2D.build.InelasticFiberSection.tcl.txt"
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REFERENCE_PUSH_TCL = _ROOT / "data" / "Ex3.Canti2D.analyze.Static.Push.tcl.txt"
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REFERENCE_EQ_TCL = _ROOT / "data" / "Ex3.Canti2D.analyze.Dynamic.EQ.Uniform.tcl.txt"
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def _ground_motion_values() -> list[float]:
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return parse_plain_values(GROUND_MOTION_FILE)
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def build_ex3_canti2d_inelastic_fiber_section() -> Project:
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values = _ground_motion_values()
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cover_y = H_COL / 2.0
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cover_z = B_COL / 2.0
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core_y = cover_y - COVER_COL
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core_z = cover_z - COVER_COL
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return Project(
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meta=ProjectMeta(
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name="OpenSees Ex 3 - Cantilever (Fiber Section Build)",
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author="OpenSees Wiki / Silvia Mazzoni & Frank McKenna",
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description="Example 3 cantilever with inelastic fiber section and shared analysis files.",
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units=UnitSystem.US_IN_KIP,
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),
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ndm=2, ndf=3,
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nodes=[
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Node(id=1, name="Base", coords=(0.0, 0.0, 0.0), restraint=(True, True, False, False, False, True)),
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Node(id=2, name="Top", coords=(0.0, L_COL, 0.0), mass=(MASS, 1.0e-9, 0.0, 0.0, 0.0, 0.0)),
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],
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materials=[
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Concrete02(id=1, name="Cover-Concrete", fpc=FC1U, epsc0=EPS1U, fpcu=FC2U, epsU=EPS2U, lambda_=LAMBDA, ft=FTU, Ets=ETS),
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Steel02(id=2, name="Rebar-Steel", Fy=FY, E0=ES, b=BS, R0=R0, cR1=CR1, cR2=CR2),
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],
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sections=[
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FiberSection(
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id=1,
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name="RC-Fiber-Section",
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patches=[RectangularPatch(material_id=1, n_fib_y=16, n_fib_z=4, y_i=-cover_y, z_i=-cover_z, y_j=cover_y, z_j=cover_z)],
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layers=[
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StraightLayer(material_id=2, n_bars=NUM_BARS_COL, bar_area=BAR_AREA_COL, y_start=-core_y, z_start=core_z, y_end=-core_y, z_end=-core_z),
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StraightLayer(material_id=2, n_bars=NUM_BARS_COL, bar_area=BAR_AREA_COL, y_start=core_y, z_start=core_z, y_end=core_y, z_end=-core_z),
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],
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),
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],
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elements=[
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ForceBeamColumn(id=1, name="Column", nodes=(1, 2), section_id=1, integration_points=NUM_INT_PTS, geom_transf="Linear"),
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],
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time_series=[
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LinearTimeSeries(id=1, name="Gravity"),
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LinearTimeSeries(id=200, name="Lateral"),
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PathTimeSeries(id=400, name="BM68elc", dt=GROUND_DT, factor=GROUND_FACTOR, values=values, file_path=str(GROUND_MOTION_FILE.name)),
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],
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load_patterns=[
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PlainLoadPattern(id=1, name="Gravity", time_series_id=1, nodal_loads=[NodalLoad(node_id=2, forces=(0.0, -P_COL, 0.0, 0.0, 0.0, 0.0))]),
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PlainLoadPattern(id=200, name="Pushover-X", time_series_id=200, nodal_loads=[NodalLoad(node_id=2, forces=(H_LOAD, 0.0, 0.0, 0.0, 0.0, 0.0))]),
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UniformExcitationPattern(id=400, name="GroundMotion-X", direction=1, accel_series_id=400),
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],
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analyses=[
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StaticCase(id=1, name="Gravity", pattern_ids=[1], n_steps=N_GRAVITY, load_factor_increment=GRAVITY_STEP, system="BandGeneral", constraints="Plain", integrator="LoadControl", algorithm="Newton", test="NormDispIncr", tolerance=1e-8, max_iter=6),
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PushoverCase(id=2, name="Push", preload_case_ids=[1], pattern_ids=[200], control_node=2, control_dof=1, target_disp=PUSH_TARGET, step_size=PUSH_STEP, base_nodes=[1], system="BandGeneral", constraints="Plain", algorithm="Newton", test="EnergyIncr", tolerance=1e-8, max_iter=6),
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TransientCase(id=3, name="Earthquake", preload_case_ids=[1], pattern_ids=[400], dt=ANALYSIS_DT, n_steps=ANALYSIS_STEPS, system="SparseGeneral", constraints="Transformation", integrator="Newmark", integrator_params=(0.5, 0.25), algorithm="ModifiedNewton", test="EnergyIncr", tolerance=1e-8, max_iter=10, rayleigh_mode1_damping=DAMPING_RATIO),
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],
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)
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def main() -> None:
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project = build_ex3_canti2d_inelastic_fiber_section()
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project.validate_references()
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print(f"Built '{project.meta.name}'")
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print(f" Build Tcl: {REFERENCE_BUILD_TCL.name}")
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print(f" Analysis Tcls: {REFERENCE_PUSH_TCL.name}, {REFERENCE_EQ_TCL.name}")
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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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