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Section.fromSHAPE

Function to create parametric general sections (non-composite or composite).
This function requires Shape object to create sections.

Constructor

Section.FromShape(Name:str,shape1:Shape,shape2:Shape=None,shape3:Shape=None,shape4:Shape=None, Offset:Offset=Offset(),useShear:bool=True,use7Dof:bool=False,id:int=None)

Creates a Section from shape objects.

Parameters

  • Name: Section name
  • shape1: Shape object.
  • shape2: Shape object (Part 2 of composite section).
  • shape3: Shape object (Part 3 of composite section).
  • shape4: Shape object (Part 4 of composite section).
  • Offset (default=Offset.CC()): Section offset parameters
  • useShear (default=True): Enable shear deformation
  • use7Dof (default=False): Enable warping (7DOF)
  • id (default=None): Section ID (auto-assigned if 0)

Method

  • plot: Show a matplotlib plot of the Shape object.

Non-Composite Section

Non-Composite sections are created as PSC-Value sections.

1. Hollow Box section

from midas_civil import *

Element.Beam.SE((0,0,0),(5,0,0),5)
Node.create()
Element.create()

hollowShape = Shape(
    outerPTs=Shape.roundRect(3,0.5,0.1),
    innerPTs=[Shape.roundRect(0.3,0.3,0.1,origin_X=1.0),
              Shape.roundRect(0.3,0.3,0.1,origin_X=0.35),
              Shape.roundRect(0.3,0.3,0.1,origin_X=-1.0),
              Shape.roundRect(0.3,0.3,0.1,origin_X=-0.35)]
    )

Section.FromShape('Hollow Rect',hollowShape,id=1)

Section.create()

2. Built-up Section

from midas_civil import *

Element.Beam.SE((0,0,0),(5,0,0),5)
Node.create()
Element.create()

Shape1 = Shape(outerPTs=
               [Shape.c_shape(1,0.5,0.1,0.1,r1=0.05,r2=0.05,origin_X=-1),
                Shape.c_shape(1,0.5,0.1,0.1,r1=0.05,r2=0.05,origin_X=1,angle=180),
                Shape.rect(2,0.05,origin_Y=0.54),
                Shape.rect(2,0.05,origin_Y=-0.54)]
                )


Section.FromShape('CustomShape',Shape1)

Section.create()

Composite Section

Composite Sections are created as Composite General Sections.
Material properties of Part-1 is taken as reference material for other parts.

1. Composite Super-T section

from midas_civil import *

Element.Beam.SE((0,0,0),(5,0,0),5)
Node.create()
Element.create()

SuperT = Shape(Shape.AS_SuperT_RMS2019('T2','M'),mat=(35000,0.2,24))
Slab = Shape(Shape.rect(2.5,0.25,origin_Y=0.68),mat=(35000,0.2,24))

Section.FromShape('Composite Section',SuperT,Slab)

Section.create()

alt text

Shape

A separate class to create section shape object (polygon + material properties).

Constructor

Shape(outerPTs,innerPTs=None,mat=(2.1e8,0.3,7.85))

Creates a shape object with given outer points (outer shape) , inner points (holes) and material properties.

from midas_civil import *

Shape(Shape.angle_shape(10,12,1.5,1.5,1,1))

Parameters

  • outerPTs: List of (x,y) points representing the outer polygon. Can be List of list of (x,y) points for multiple outer polygons.
  • innerPTs: List of (x,y) points representing the inner polygon. Can be List of list of (x,y) points for multiple inner polygons.
  • mat: Tuple (E (Modulus of elasticity) , v (Poisson's Ratio) , w (Weight density)) . Eg. (2.1e8 , 0.3 , 7.85)

Method

  • plot: Show a matplotlib plot of the Shape object. 
from midas_civil import *

shape1 = Shape(Shape.angle_shape(10,12,1.5,1.5,1,1))
shape1.plot()

Shapes

Standard Shape function can generate various shapes points [(x,y)...] to easily create parametric sections.

Common Parameters

  • nSides: No. of sides create for any arc/curve segment.
  • origin_X: Offset section along x-direction (horizontal)
  • origin_Y: Offset section along y-direction (vertical)
  • angle: Rotate section about z-axis passing through origin (red circle).

Rectangle

Shape.rect(b:float,d:float, origin_X:float=0,origin_Y:float=0,angle:float=0)

Rounded Rectangle

Shape.roundRect(b:float,d:float,radius:float=0,nSides:int=8,origin_X:float=0,origin_Y:float=0,angle:float=0)

Circle

Shape.circle(r:float,nSides:int=18, origin_X:float=0,origin_Y:float=0,angle:float=0)

I-shape

Shape.i_shape(H,B1,tw,tf1,B2=None,tf2=None,r1=0,r2=0,nSides=8, origin_X:float=0,origin_Y:float=0,angle:float=0)

Angle

Shape.angle_shape(H,B,tw,tf,r1=0,r2=0,nSides=8, origin_X:float=0,origin_Y:float=0,angle:float=0)

T- shape

Shape.t_shape(H,B,tw,tf,r1=0,r2=0,nSides=8, origin_X:float=0,origin_Y:float=0,angle:float=0))

C- shape

Shape.c_shape(H,B1,tw,tf1,B2=None,tf2=None,r1=0,r2=0,nSides=8, origin_X:float=0,origin_Y:float=0,angle:float=0)

AS Super T (RMS 2019)

AS_SuperT_RMS2019(type:_AS_ST19='T1',ModelUnit:str=None)

  • type : Type of Super T section. Eg. 'T1', 'T2', 'T3', 'T4' or 'T5'
  • ModelUnit : Unit in which section co-ordinates are desired. Eg. 'MM', 'IN', 'CM', 'FT' or 'M
                             If None is provided, units is automatically taken from the model.