Column

Description Create a new model Set model base data (activate addons, select standard, …) Define and create model objects Perform stability analysis Define steel desgin configuration and steel effective length Perform steel design

from math import inf
from dlubal.api import rfem


def define_structure() -> list:
    """Define and return a list of structural objects."""

    return [
        # Define material
        rfem.structure_core.Material(
            no=1,
            name='S235',
        ),

        # Define section
        rfem.structure_core.Section(
            no=1,
            name='HEB 300',
            material=1,
            shear_stiffness_deactivated=True,
        ),

        # Define nodes
        rfem.structure_core.Node(
            no=1,
        ),
        rfem.structure_core.Node(
            no=2,
            coordinate_3=10.0,
        ),

        # Define member
        rfem.structure_core.Member(
            no = 1,
            line = 1,
            node_start=1,
            node_end=2,
            section_start = 1
        ),

        # Define nodal support at Node 1
        rfem.types_for_nodes.NodalSupport(
            no=1,
            nodes=[1],
            spring_x=inf,
            spring_y=inf,
            spring_z=inf,
            rotational_restraint_x=5000000,
            rotational_restraint_y=5000000,
            rotational_restraint_z=inf,
        ),

        # Define nodal support at Node 2
        rfem.types_for_nodes.NodalSupport(
            no=2,
            nodes=[2],
            spring_x=inf,
            spring_y=inf,
            spring_z=0,
            rotational_restraint_x=0,
            rotational_restraint_y=0,
            rotational_restraint_z=inf,
        ),
    ]

def define_loading() -> list:
    """Define and return a list of loading objects."""

    return [
        # Static analysis settings
        rfem.loading.StaticAnalysisSettings(
            no=1,
            analysis_type=rfem.loading.StaticAnalysisSettings.ANALYSIS_TYPE_GEOMETRICALLY_LINEAR
        ),

        # Stability analysis settings
        rfem.loading.StabilityAnalysisSettings(
            no=1,
            analysis_type=rfem.loading.StabilityAnalysisSettings.ANALYSIS_TYPE_EIGENVALUE_METHOD,
            number_of_lowest_eigenvalues=2,
        ),

        # Define load cases
        rfem.loading.LoadCase(
            no=1,
            stability_analysis_settings=1,
            calculate_critical_load=True,
            self_weight_active=False,
        ),

        # Define nodal loads
        rfem.loads.NodalLoad(
            no=1,
            load_case=1,
            nodes=[2],
            load_type=rfem.loads.NodalLoad.LOAD_TYPE_COMPONENTS,
            components_force_z=-1000000,  # Force in Z direction (N)
        ),

        # Define design situation
        rfem.loading.DesignSituation(
            no=1,
            design_situation_type=rfem.loading.DesignSituation.DESIGN_SITUATION_TYPE_STR_PERMANENT_AND_TRANSIENT_6_10,
        ),

        # Define load combination
        rfem.loading.LoadCombination(
            no=1,
            name='CO1',
            items =  rfem.loading.LoadCombination.ItemsTable(
                    rows=[
                        rfem.loading.LoadCombination.ItemsRow(
                            load_case=1,
                            factor=1,
                        ),
                    ]
            ),
            design_situation=1,
        ),


    ]

def define_steel_design() -> list:
    """Define and return a list of steel design objects."""

    return [
        # Define steel design configuration
        rfem.steel_design_objects.SteelDesignUlsConfiguration(
            no=1,
            assigned_to_all_members=True,
        ),

        # Set steel effective length from stability analysis
        rfem.types_for_steel_design.SteelEffectiveLengths(
            no=1,
            members=[1],
            import_from_stability_analysis_enabled=True,
            stability_import_data_loading_y=rfem.ObjectId(
                no=1, object_type =
                rfem.OBJECT_TYPE_LOAD_CASE
            ),
            stability_import_data_loading_z=rfem.ObjectId(
                no=1, object_type =
                rfem.OBJECT_TYPE_LOAD_CASE
            ),
            stability_import_data_mode_number_y=2,
            stability_import_data_mode_number_z=1,
            stability_import_data_member_y=1,
            stability_import_data_member_z=1,
        ),
    ]


"""Runs the structural analysis example."""

with rfem.Application() as rfem_app:

    # Step 1: Create a new model
    rfem_app.close_all_models(save_changes=False)
    rfem_app.create_model(name='column_stability')

    # Step 2: Set model base data
    base_data = rfem_app.get_base_data()

    base_data.general_settings.global_axes_orientation = rfem.BaseData.GeneralSettings.GLOBAL_AXES_ORIENTATION_ZUP
    base_data.addons.structure_stability_active = True
    base_data.addons.steel_design_active = True
    base_data.standards.steel_design_standard = rfem.BaseData.Standards.STEEL_DESIGN_NATIONAL_ANNEX_AND_EDITION_EN_1993_DIN_2020_11_STANDARD

    rfem_app.set_base_data(base_data=base_data)

    # Step 3: Define and create model objects
    rfem_app.delete_all_objects()
    objects = define_structure() + define_loading()
    rfem_app.create_object_list(objects)

    # Step 4: Perform stability analysis
    stability_analysis = rfem_app.calculate_all(skip_warnings=True)
    print(f"\nStability Analysis:\n{stability_analysis}")

    # Step 5: Define steel desgin configuration incl effective length
    objects = define_steel_design()
    rfem_app.create_object_list(objects)

    # Step 6: Perform steel design
    steel_design = rfem_app.calculate_all(skip_warnings=True)
    print(f"\nSteel Design:\n{steel_design}")