WFSection2d

WFSection2d

WFSection2d(user_name: str = 'Unnamed', *, material: Union[int, str, Material], d: float, tw: float, bf: float, tf: float, Nflweb: int, Nflflange: int)

Bases: Section

Wide-flange section for internal 2D fiber discretization.

This section type represents a standard wide-flange (I-shape) beam or column. It automates the discretization of the cross-section into a collection of internal fibers, making it much easier to define than a manual FiberSection.

Tcl form

section WFSection2d <tag> <d> <tw> <bf> <tf> <Nflweb> <Nflflange> <matTag>

Note

• This section is strictly 2D. It only supports strong-axis bending and axial response.
• The discretization creates longitudinal fibers. The number of fibers in the web (Nflweb) and flanges (Nflflange) controls integration accuracy across the depth.

Tip

• Use this section for steel frame modeling where nonlinear material behavior is required without manual fiber layout.
• Eight to twelve web fibers and two to four flange fibers are often sufficient for standard structural steel models.

Example

from femora.core.model import Model
import femora.components.section.beam  # noqa: F401

model = Model()
mat = model.material.uniaxial.steel01(
    user_name="Steel",
    Fy=50.0,
    E0=29000.0,
    b=0.01,
)
sec = model.section.beam.wf2d(
    user_name="W14X90_Nonlinear",
    material=mat,
    d=14.0,
    tw=0.44,
    bf=14.5,
    tf=0.71,
    Nflweb=8,
    Nflflange=4,
)
print(sec.tag)

Create a WFSection2d with validated dimensions and discretization.

Parameters:

Name	Type	Description	Default
user_name	str	Unique identifier for the section.	'Unnamed'
material	Union[int, str, Material]	Uniaxial material reference for the entire section.	required
d	float	Total section depth.	required
tw	float	Web thickness.	required
bf	float	Flange width.	required
tf	float	Flange thickness.	required
Nflweb	int	Number of fibers along the web depth.	required
Nflflange	int	Number of fibers along each flange width.	required

Raises:

Type	Description
ValueError	If the material cannot be resolved, or if any dimension is non-positive, or if fiber counts are not positive integers.