polygon_hollow_section#
- sectionproperties.pre.library.steel_sections.polygon_hollow_section(d: float, t: float, n_sides: int, r_in: float = 0.0, n_r: int = 1, rot: float = 0.0, material: Material = Material(name='default', elastic_modulus=1, poissons_ratio=0, yield_strength=1, density=1, color='w')) Geometry [source]#
Constructs a regular hollow polygon section.
Constructs a regular hollow polygon section centered at
(0, 0)
, with a pitch circle diameter of bounding polygond
, thicknesst
, number of sidesn_sides
and an optional inner radiusr_in
, usingn_r
points to construct the inner and outer radii (if radii is specified).- Parameters:
d (float) – Pitch circle diameter of the outer bounding polygon (i.e. diameter of circle that passes through all vertices of the outer polygon)
t (float) – Thickness of the polygon section wall
n_sides (int) – Number of sides of the polygon
r_in (float) – Inner radius of the polygon corners. By default, if not specified, a polygon with no corner radii is generated.
n_r (int) – Number of points discretising the inner and outer radii, ignored if no inner radii is specified
rot (float) – Initial counterclockwise rotation in degrees. By default bottom face is aligned with x axis.
material (Material) – Material to associate with this geometry
- Raises:
ValueError – Number of sides in polygon must be greater than or equal to 3
- Returns:
Regular hollow polygon section geometry
- Return type:
Example
The following example creates an octagonal section (8 sides) with a diameter of 200 mm, a thickness of 6 mm and an inner radius of 20 mm, using 12 points to discretise the inner and outer radii:
from sectionproperties.pre.library import polygon_hollow_section polygon_hollow_section( d=200, t=6, n_sides=8, r_in=20, n_r=12 ).plot_geometry()
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Source code
,png
,hires.png
,pdf
)