Section

The module provides functionality to create, manage, and synchronize various types of cross-sections (User-defined, PSC, and Composite sections) in the model.

Note.

All the codes below assumes the initial import and MAPI Key definition.

from midas_civil import *
MAPI_KEY('eyJ1ciI6InN1bWl0QG1pZGFzaXQuY29tIiwicGciO252k81571d')

Class Attributes

Section.sect -> List of all sections.

Methods

---

create

Creates all defined sections (User-defined, PSC, and Composite sections) in Civil NX.

Section.create()

json

Returns a JSON representation of all Sections defined in python.

s1 = Section.DBUSER("Rect1", "SB", [1.0, 0.5])
s2 = Section.PSC.I("PSC_I1", True, [0,0,0,0,0,0,0,0,0], 2.0)

print(Section.json())

# Output:
# {'Assign': {1: {'SECTTYPE': 'DBUSER', 'SECT_NAME': 'Rect1', ...}, 2: {'SECTTYPE': 'PSC', 'SECT_NAME': 'PSC_I1', ...}}}

get

Fetches sections from Civil NX and returns the JSON representation.

print(Section.get())
# Output
# {'SECT': {'1': {'SECTTYPE': 'DBUSER', 'SECT_NAME': 'Rect1', ...}, '2': {'SECTTYPE': 'PSC', 'SECT_NAME': 'PSC_I1', ...}}}

sync

Retrieves Section data from Civil NX and rebuilds the internal section list.

Section.sync()
for sect in Section.sect:
    print(f'Section: {sect.NAME} | Type: {sect.TYPE}')

v1.4.9
Added sync(bDBSectParams = False, bSectionProperty = False)

• bSectionProperty - adds Section property in section object
  Added properties

  Property	Name
  Area	sec.AREA
  Eff. Shear Area Y	sec.ASY
  Eff. Shear Area Z	sec.ASZ
  Torsional Resistance	sec.IXX
  Moment of Inertia Y	sec.IYY
  Moment of Inertia Z	sec.IZZ

• bDBSectParams - adds PARAMS to DB section parameters
  DB sections are codal sections and hence contains only Code Name and Section Name. Incase section dimensions are need, this option can be used. Parameters are stored in sec.PARAMS

delete

Deletes all section data from both Python and Civil NX.

Section.delete()

Offset

---

Constructor

To create section offset parameters, use the Offset constructor.

Offset(OffsetPoint='CC', CenterLocation=0, HOffset=0, HOffOpt=0, VOffset=0, VOffOpt=0, UsrOffOpt=0)

Creates offset parameters for sections with specified reference point and offset values.

Parameters

• OffsetPoint (default='CC'): Offset reference point ('CC', 'CT', etc.)
• CenterLocation (default=0): Center location parameter
• HOffset (default=0): Horizontal offset value
• HOffOpt (default=0): Horizontal offset option
• VOffset (default=0): Vertical offset value
• VOffOpt (default=0): Vertical offset option
• UsrOffOpt (default=0): User offset option

# Create center-center offset
offset_cc = Offset.CC()

# Create center-top offset
offset_ct = Offset.CT()

# Create custom offset
custom_offset = Offset('CC', 0, 2.5, 0, 1.0, 0, 0)

---

Examples

# Composite Steel I-Section Example
for i in range(2):
    Node(i*10, 0, 0)
    Node.create()

Element.Beam(1, 2)
Element.create()

# Create composite steel I-section
Section.Composite.SteelI_Type1(
    Name="Composite_Steel_I",
    Bc=3, tc=0.25,  # Slab parameters
    Hw=2, B1=2.5, tf1=0.2, # Steel I parameters
    tw=0.2, B2=2.5, tf2=0.2,  
    EsEc=6.39, DsDc=3.0792, Ps=0.3, Pc=0.2, TsTc=1.2,

    # Offset and effects
    Offset=Offset.CT(),
    useShear=True,
    use7Dof=False,
    id=13
)
Section.create()

Complete Example

---

from midas_civil import *

MAPI_KEY("eyJ1ciI6IklOMjQwN0ZZVDIiLCJwZyI6ImNpdmlsIiwi")  # Paste your MAPI Key

# Create nodes and elements
for i in range(6):
    Node(i*10, 0, 0)
    Node.create()

for i in range(5):
    Element.Beam(i+1, i+2)
    Element.create()

# Create various section types

# 1. User-defined rectangular section
Section.DBUSER("Rect_1x0.5", "SB", [1.0, 0.5])

# 2. PSC 1-cell section
Section.PSC.CEL12(
    Name="PSC Box",
    Shape="1CEL",
    Joint=[1, 0, 0, 1, 0, 1, 0, 1],

    HO1=0.2,
    HO2=0.3,
    HO22=0.5,
    HO3=2.5,

    BO1=1.5,
    BO11=0.5,
    BO2=0.5,
    BO3=2.25,

    HI1=0.24,
    HI2=0.26,
    HI3=2.05,
    HI31=0.71,
    HI4=0.2,
    HI5=0.25,

    BI1=2.2,
    BI11=0.7,
    BI21=2.2,
    BI3=1.932,
    BI31=0.7,

    Offset=Offset.CT(),  # "Center-Top" selected
    useShear=True,       # Shear deformation checkbox is selected
    use7Dof=False,       # Warping effect (7th DOF) not checked
    id=2
)

# 3. PSC I-section (symmetric)
Section.PSC.I(
    Name="PSC_I_Symmetric",
    Symm=True,
    Joint=[0,0,0,0,0,0,0,0,0],
    HL1=0.3, HL2=0.5, HL3=1.5, HL4=0.3, HL5=0.3,
    BL1=0.3, BL2=2, BL4=2,
     Offset=Offset.CT(),  # "Center-Top" selected
    useShear=True,       # Shear deformation checkbox is selected
    use7Dof=False,       # Warping effect (7th DOF) not checked
    id=3
)

# 4. Composite PSC I-section
Section.Composite.PSCI(
    Name="Composite_PSC_I",
    Symm=True,  # Symmetrical section
    Joint=[0, 0, 0, 0, 0, 0, 0, 0, 0],  # Joint 

    # slab parameters
    Bc=3,
    tc=0.225,
    Hh=0,


    # Girder parameters
    HL1=0.15,
    HL2=0.1,
    HL3=1.43,
    HL4=0.12,
    HL5=0.3,

    BL1=0.14,
    BL2=0.425,
    BL4=0.375,


    # Material properties
    EgdEsb=1.06922,     # Elastic modulus ratio (girder/slab)
    DgdDsb=1.0,     # Density ratio
    Pgd=0.2,        # Poisson's ratio (girder)
    Psb=0.2,        # Poisson's ratio (slab)
    TgdTsb=1.0,     # Thermal expansion coefficient ratio

    # Time-dependent properties
    MultiModulus=False,

    # Offset and effects
    Offset=Offset.CT(),
    useShear=True,
    use7Dof=False,
    id=4
)
Section.create()

# 5. Composite steel I-section
Section.Composite.SteelI_Type1(
    Name="Composite_Steel_I",
    Bc=3, tc=0.25,  # Slab parameters
    Hw=2, B1=2.5, tf1=0.2, # Steel I parameters
    tw=0.2, B2=2.5, tf2=0.2,  
    EsEc=6.39, DsDc=3.0792, Ps=0.3, Pc=0.2, TsTc=1.2,

    # Offset and effects
    Offset=Offset.CT(),
    useShear=True,
    use7Dof=False,
    id=5
)

# Create all sections in Civil NX
Section.create()

print("Sections created successfully!")