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 midasapi import *
MAPI_KEY('eyJ1ciI6InN1bWl0QG1pZGFzaXQuY29tIiwicGciO252k81571d')
Section
The Section class provides a unified interface to create different types of cross-sections and includes nested classes for specific section types.
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}')
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 parameterHOffset (default=0): Horizontal offset valueHOffOpt (default=0): Horizontal offset optionVOffset (default=0): Vertical offset valueVOffOpt (default=0): Vertical offset optionUsrOffOpt (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 midasapi 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!")